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copyright ? 2010 cree, inc. all rights reserved. the information in this document is subject to change without notice. cree, the cree logo and xlamp are registered trademarks of cree, inc. cld-ap122 rev 1a cree ? xlamp ? cxa2530/cxa2540 led retail track light reference design www. cree.com/xlamp cree, inc. 4600 silicon drive durham, nc 27703 usa tel: +1.919.407.5300 application note introduction this application note details the design of a 39 - watt equivalent retail track light using crees xlamp cxa2530 l e d. the cxa2530 is optimized to simplify designs and lower system cost and can enable system- level performance of 2000 to 5000 lumens. the xlamp cxa2530 l e d delivers high lumen output and high effcacy in a single, easy-to-use package that eliminates the need for refow soldering. the xlamp cxa2530 l e d highlighted in this reference design is optimized to enable applications that traditionally use halogen, ceramic metal halide (c mh) and compact fuorescent lamp (cfl) technology. in this reference design, the xlamp cxa2530 l e d is used in a retail track light that operates on direct line 120 -v ac input. the goal of the design is to enable a retail track light with a narrow beam, based on a single xlamp cxa2530 l e d, delivering performance equivalent to a 39- watt c m h lamp. copyright ? 2013 cree, inc. all rights reserved. the information in this document is subject to change without notice. cree ? , the cree logo and xlamp ? are registered trademarks and easywhite? is a trademark of cree, inc. for product specifcations, please see the data sheets available at www.cree.com. for warranty information, please contact cree sales at sales@cree.com. table of contents introduction .......................................................... 1 design approach/objectives .............................. 2 the 6-step methodology ................................. 2 1. defne lighting requirements ....................... 2 2. defne design goals ................................. 5 3. estimate effciencies of the optical, thermal & electrical systems ................................... 6 4. calculate the number of leds needed ............. 8 5. consider all design possibilities .................... 9 6. complete the fnal steps ............................ 9 conclusions ............................................... 12 special thanks ............................................ 13 bill of materials ........................................... 13 appendix .................................................. 14 reliance on any of the information provided in this application note is at the users sole risk. cree and its affliates make no warranties or representations about, nor assume any liability with respect to, the information in this document or any l e d-based lamp or luminaire made in accordance with this reference design, including without limitation that the lamps or luminaires will not infringe the intellectual property rights of cree or a third party. luminaire manufacturers who base product designs in whole or part on any cree application note or r eference design are solely responsible for the compliance of their products with all applicable laws and industry requirements. technical article
2 the appendix to this reference design shows the results obtained when an xlamp cxa2540 l e d was used in place of the cxa2530 le d. design approach/objectives in the l e d luminaire design guide application note, cree advocates a 6- step framework for creating le d luminaires. 1 all cree reference designs use this framework, and the design guides summary table is reproduced below. step explanation 1. defne lighting requirements ? the design goals can be based either on an existing fxture or on the application s lighting requirements. 2. defne design goals ? specify design goals, which will be based on the applications lighting requirements. ? specify any other goals that will infuence the design, such as special optical or environmental requirements. 3. estimate effciencies of the optical, thermal & electrical systems ? design goals will place constraints on the optical, thermal and electrical systems. ? good estimations of effciencies of each system can be made based on these constr aints. ? the combination of lighting goals and system effciencies will driv e the number of leds needed in the luminaire. 4. calculate the number of leds needed ? based on the design goals and estimated losses, the designer can calculate the number of leds to meet the design goals. 5. consider all design possibilities and choose the best ? w ith any design, there are many ways to achieve the goals. ? led lighting is a new feld; assumptions that work for conventional lighting sources may not apply. 6. complete fnal steps ? complete circuit board layout. ? test design choices by building a prototype luminaire. ? m ake sure the design achieves all the design goals. ? use the prototype to further refne the luminaire design. ? r ecord observations and ideas for improvement. table 1: cree 6-step framework the 6-step methodology the goal for this project is to demonstrate an easy-to-implement, high-output lamp that can better the performance of 39 -w cm h lamps currently on the market, showing that a narrow-beam 39- watt equivalent retail track light is possible using a single xlamp cxa2530 le d. 2 1. define lighting requirements table 2 shows a ranked list of desirable characteristics to address in a track light. 1 le d luminaire design guide, application note ap15, www.cree.com/xlamp_app_notes/luminaire_design_guide 2 production and cost-optimized implementations are beyond the scope of this document. xlamp cxa2530/cxa2540 retail track light reference design copyright ? 2013 cree, inc. all rights reserved. the information in this document is subject to change without notice. cree ? , the cree logo and xlamp ? are registered trademarks and easywhite? is a trademark of cree, inc. for product specifcations, please see the data sheets available at www.cree.com. for warranty information, please contact cree sales at sales@cree.com.
3 importance characteristics units critical luminous fux lumens (lm) light intensity - center beam candle power (cbcp) candelas (cd) beam angle - full width half maximum (fwhm) degrees () luminaire effcacy lm/w electrical power watts ( w) important lifetime hours o perating temperatures c correlated color temperature (cct) k color rendering index (cri) 100-point scale power factor table 2: ranked design criteria for a track light table 3 and table 4 summarize the ener gy star ? requirements for directional commercial and residential luminaires. 3 luminaire type luminaire effcacy (initial) energy star requirements luminaire minimum light output (initial) luminaire zonal lumen density requirement accent lights ? includes line voltage track heads ? includes directional ceiling fan light kits 35 lm/w luminaire shall deliver a minimum of 200 lumens per head. luminaire shall deliver a minimum of 80% of total initial lumens within the 0-40 zone (axially symmetric about the center of the beam). table 3: energy star luminous effcacy, output and zonal lumen density requirements characteristic requirements light source life requirements: all luminaires the led package(s) / led module(s) / le d array(s), including those incorporated into led light engines or gu24 based integrated l e d lamps, shall meet the following l70 lumen maintenance life values (refer to lumen maintenance r equirements in the next section): ? 25,000 hours for residential grade indoor luminaires ? 35,000 hours for residential grade outdoor luminaires ? 35,000 hours for commercial grade luminaires lumen maintenance life projection claims in excess of the above requirements shall be substantiated with a tm-21 lumen maintenance life projection report. 3 energy star program requirements, product specifcation for luminaires (light fixtures), eligibility criteria, version 1.2, www.energystar.gov/ia/partners/product_specs/program_reqs/final_luminaires_v1_2.pdf?7b7d-2473 xlamp cxa2530/cxa2540 retail track light reference design copyright ? 2013 cree, inc. all rights reserved. the information in this document is subject to change without notice. cree ? , the cree logo and xlamp ? are registered trademarks and easywhite? is a trademark of cree, inc. for product specifcations, please see the data sheets available at www.cree.com. for warranty information, please contact cree sales at sales@cree.com.
4 characteristic requirements lumen maintenance requirements: directional and non-directional luminaires the le d package(s) / module(s) / array(s), including those incorporated into led light engines or gu24 based integrated l ed lamps, shall meet the following l 70 (6k) rated lumen maintenance life values, in situ: ? l 70 (6k) 25,000 hours for residential indoor ? l 70 (6k) 35,000 hours for residential outdoor, or commercial compliance with the above shall be documented with a t m-21 lumen maintenance life projection report as detailed in tm -21, section 7. the report shall be generated using data from the lm-80 test report for the employed l e d package/module/array model (device), the forward drive current applied to each device, and the in situ tmp led temperature of the hottest l e d in the luminaire. in addition to lm -80 reporting requirements, the following information shall be reported: ? sampling method and sample size (per l m-80 section 4.3) ? test results for each t s and drive current combination ? description of device including model number and whether device is an le d package, module or array (see defnitions) ? ansi target, and calculated cct value(s) for each device in sample set ? uv chromaticity shift value on the cie 1976 diagram for each device in sample set ? a detailed rationale, with supporting data, for application of results to other devices (e.g. l ed packages with other ccts) access to the tmp led for the hottest le d may be accomplished via a minimally sized hole in the luminaire housing, tightly resealed with a suitable sealant if created for purposes of testing. all thermocouple attachments and intrusions to luminaire housing shall be photographed. cct requirements: all indoor luminaires the luminaire (directional luminaires), or replaceable le d light engine or gu24 based integrated led lamp (non- directional luminaires) shall have one of the following nominal ccts: ? 2700 kelvin ? 3000 kelvin ? 3500 kelvin ? 4000 kelvin ? 5000 kelvin (commercial only) the luminaire, le d light engine or gu24 based integrated led lamp shall also fall within the corresponding 7-step chromaticity quadrangles as defned in ansi/nema/anslg c78.377-2008. color rendering requirements: all indoor luminaires the luminaire (directional luminaires), or replaceable le d light engine or gu24 based integrated led lamp (non- directional luminaires) shall meet or exceed ra 80. color angular uniformity requirements: directional solid state indoor luminaires throughout the zonal lumen density angles detailed above, and fve degrees beyond, the variation of chromaticity shall be within 0.004 from the weighted average point on the ci e 1976 (u,v) diagram. color maintenance requirements: solid state indoor luminaires only the change of chromaticity over the frst 6,000 hours of luminaire operation shall be within 0.007 on the cie 1976 (u,v) diagram, as demonstrated by either: ? the ies lm -80 test report for the employed le d package/array/module model, or ? as demonstrated by a comparison of luminaire chromaticity data in l m -79 reports at zero and 6,000 hours, or ? as demonstrated by a comparison of l e d light engine or gu24 based integrated le d lamp chromaticity data in lm -82 reports at zero and 6,000 hours. source start time requirement: directional and non-directional luminaires light source shall remain continuously illuminated within one second of application of electrical power. dimming requirements the luminaire and its components shall provide continuous dimming from 100% to 35% of total light output. step dimming, if employed, shall provide at least two discrete light output levels 35% of total light output and not including 100% output. power factor requirements: directional and non-directional luminaires total luminaire input power less than or equal to 5 watts: pf 0.5 total luminaire input power greater than 5 watts: residential: pf 0.7 commercial: pf 0.9 xlamp cxa2530/cxa2540 retail track light reference design copyright ? 2013 cree, inc. all rights reserved. the information in this document is subject to change without notice. cree ? , the cree logo and xlamp ? are registered trademarks and easywhite? is a trademark of cree, inc. for product specifcations, please see the data sheets available at www.cree.com. for warranty information, please contact cree sales at sales@cree.com.
5 characteristic requirements transient protection requirements: all luminaires ballast or driver shall comply with ansi/i eee c62.41.1-2002 and ansi/ieee c62.41.2-2002, class a operation. the line transient shall consist of seven strikes of a 100 khz ring wave, 2.5 k v level, for both common mode and differential mode. o perating frequency requirements: directional and non-directional luminaires frequency 120 hz note: this performance characteristic addresses problems with visible ficker due to low frequency operation and applies to steady-state as well as dimmed operation. dimming operation shall meet the requirement at all light output levels. noise requirements: directional and non-directional luminaires all ballasts & drivers used within the luminaire shall have a class a sound rating. ballasts and drivers are recommended to be installed in the luminaire in such a way that in operation, the luminaire will not emit sound exceeding a measured level of 24 ba. table 4: energy star luminaire requirements the designlights? consortium (dlc) provides requirements for track or mono-point directional lighting fxtures, summarized in table 5. 4 characteristic unit dlc value minimum light output lm 250 zonal lumen density 85%: 0-90 minimum luminaire effcacy lm/w 40 allowable ccts (ansi c78.377-2008) k 5000 cri 80 l70 lumen maintenance hours 50,000 m inimum luminaire warranty years 5 table 5: dlc track light requirements 2. define design goals in addition to the requirements given in the above tables, we examined existing 39- w cm h lamp data sheets to develop the goals shown in table 6. w e found that the input power for luminaires using 39- w cm h lamps is 44 to 45 w , so we targeted this reference design to be at least equivalent. table 6 shows the design goals for this project. characteristic unit minimum goal target goal light output lm 3200 > 3200 light intensity - cbcp cd 20,000 > 20,000 beam angle - fwhm degrees 15 15 luminaire effcacy lm/w 75 > 75 lifetime hours 35,000 50,000 cct k 3000 3000 cri 100-point scale 80 80 power w 44 < 44 power factor 0.9 > 0.9 table 6: cxa2530 retail track light design goals 4 technical requirements table v1.7, designlights consortium qualifed products list - non-residential applications, www.designlights.org/solidstate.manufacturer.requirements.php xlamp cxa2530/cxa2540 retail track light reference design copyright ? 2013 cree, inc. all rights reserved. the information in this document is subject to change without notice. cree ? , the cree logo and xlamp ? are registered trademarks and easywhite? is a trademark of cree, inc. for product specifcations, please see the data sheets available at www.cree.com. for warranty information, please contact cree sales at sales@cree.com.
6 3. estimate efficiencies of the optical, thermal & electrical systems w e used crees product characterization tool (pct) tool to determine the drive current for the design. 5 figure 1 shows basic electrical data and optical output from the pct. we estimated 90% optical effciency, 85% driver effciency and a solder point temperature (t sp ) of 70 c. figure 1: pct output with cxa2530 fux data the pct output shows that, at 1 a, a single xlamp cxa2530 led produces the desired lumen output and effcacy . thermal requirements proper thermal management is a key component of any successful l e d-based lamp or luminaire design. o perating at 42 w of power in this retail track light design, the xlamp cxa2530 le d requires a heat sink to dissipate this thermal load. the heat sink in this design must not only dissipate the heat generated by the l e d, but also provide the mechanical frame for the led, optic, driver and base. we used a market-ready heat sink/housing assembly, shown in figure 2. 6 the heat sink is made of anodized aluminum alloy, aa 6063, and is part of a kit that includes a cover glass, screw-on base and front optic cover ring. figure 2: cxa2530 retail track light heat sink/housing assembly 5 pct is available at: pct.cree.com 6 m odel gd120-01, losiwang, www.loswan.cn 1 led system comparison report system: 3,000 90% 87% model model model flux t2 [3200] tsp (oc) 70 flux tj (oc) 25 flux tj (oc) 25 price - $ price - $ price - $ sys # led sys lm tot sys w sys lm/w 0.900 1 3073.91 37.617 81.7 #n/a #n/a #n/a #n/a #n/a #n/a #n/a #n/a 0.950 1 3184.98 39.959 79.7 #n/a #n/a #n/a #n/a #n/a #n/a #n/a #n/a 1.000 1 3290.86 42.326 77.8 #n/a #n/a #n/a #n/a #n/a #n/a #n/a #n/a 1.100 1 3483.93 47.126 73.9 #n/a #n/a #n/a #n/a #n/a #n/a #n/a #n/a 1.200 1 3653.5 52.025 70.2 #n/a #n/a #n/a #n/a #n/a #n/a #n/a #n/a 0.000 #n/a #n/a #n/a #n/a #n/a #n/a #n/a #n/a #n/a #n/a #n/a #n/a this document is provided for informational purposes only and is not a warranty or a specification. for product specifications, please see the data sheets available at www.cree.com. copyright ? 2009-2012 cree, inc. all rights reserved. the information in this document is subject to change without notice. cree, the cree logo and xlamp are registered trademarks of cree, inc. target lumens : optical efficiency: electrical efficiency: current (a) led 1 led 2 led 3 cree xlamp cxa2530 {ezw} (none) (none) xlamp cxa2530/cxa2540 retail track light reference design copyright ? 2013 cree, inc. all rights reserved. the information in this document is subject to change without notice. cree ? , the cree logo and xlamp ? are registered trademarks and easywhite? is a trademark of cree, inc. for product specifcations, please see the data sheets available at www.cree.com. for warranty information, please contact cree sales at sales@cree.com.
7 we performed thermal simulation to verify that this thermal design is suffcient. 7 figure 3 shows thermal images of the lamp assembly. the simulated peak solder point temperature (t sp ) is 64 c, or 39 c above ambient. the thermal resistance of the xlamp cxa2530 l e d is 0.8 c/w , so at 42 w the junction temperature (t j ) will be approximately 98 c. figure 3: cxa2530 retail track light thermal simulation drive electronics cree selected a dimmable, universal input voltage driver to supply power to the retail track light. 8 the driver is a slightly modifed version of a commercially available driver model. the driver, shown in figure 4, is located off the track and is attached to the heat sink/housing assembly. figure 4: cxa2530 retail track light driver secondary optics it is a challenge to create a narrow - beam optic for a relatively large light source such as the xlamp cxa2530 le d. this design meets the challenge with a custom refector that is about 89% optically effcient and produces a 16 beam angle. 9 the refector, shown in figure 5, fts within the heat sink/housing assembly. 7 for additional information on thermal management, refer to the thermal management of cree xlamp leds application note, ap05, www.cree.com/xlamp_app_notes/thermal_management 8 model erp040w -1000-39, energy r ecovery products ( er p), www.erppowerllc.com/ 9 m odel 4-1361-1, nata lighting company limited, www.nata.cn/ thermal simulation / measurement copyright ? 2010, cree, inc. cree proprietary & confidential pg. 8 thermal simulation tsp ~64c, ? about 75% of the 42w input power will convert to heat and need sufficient heatsink to dissipate the heat ? thermal measurement by thermal couple: tsp ~63.5c ? calculated tj ~94c t2 t3 tsp t2 t3 63.5 60.4 thermal simulation / measurement copyright ? 2010, cree, inc. cree proprietary & confidential pg. 8 thermal simulation tsp ~64c, ? about 75% of the 42w input power will convert to heat and need sufficient heatsink to dissipate the heat ? thermal measurement by thermal couple: tsp ~63.5c ? calculated tj ~94c t2 t3 tsp t2 t3 63.5 60.4 xlamp cxa2530/cxa2540 retail track light reference design copyright ? 2013 cree, inc. all rights reserved. the information in this document is subject to change without notice. cree ? , the cree logo and xlamp ? are registered trademarks and easywhite? is a trademark of cree, inc. for product specifcations, please see the data sheets available at www.cree.com. for warranty information, please contact cree sales at sales@cree.com.
8 figure 5: cxa2530 retail track light refector 4. calculate the number of leds needed the dual purpose of this reference design is to show that a single l e d package can deliver equivalent lighting utility and superior performance compared to existing 39- w cm h lamps on the market and show that it is possible to produce a narrow-beam retail track light based on the xlamp cxa2530 l e d. the cxa2530 le d is a multi-chip le d package that can offer the required cbcp with new levels of led-to-led color consistency and effciency. the new xlamp cxa2530 led is 34% brighter than the original cxa2011, 10 which can enable superior le d lighting designs even more quickly. w e selected a w arm w hite le d for this reference design, shown highlighted in yellow in table 7. by choosing an led from a mid-level fux bin, we ensured that the design uses an led that is readily available. color cct range base order codes min. luminous flux @ 800 ma 2-step order code 4-step order code group flux (lm) @ 85 c flux (lm) @ 25 c* chromaticity region chromaticity region easywhite 4000k t2 3200 3609 40h cxa2530-0000-000n00t240h 40f cxa2530-0000-000n00t240f t4 3440 3879 cxa2530-0000-000n00t440h cxa2530-0000-000n00t440f u2 3680 4150 cxa2530-0000-000n00u240h cxa2530-0000-000n00u240f 3500k s4 2990 3372 35h cxa2530-0000-000n00s435h 35f cxa2530-0000-000n00s435f t2 3200 3609 cxa2530-0000-000n00t235h cxa2530-0000-000n00t235f t4 3440 3879 cxa2530-0000-000n00t435h cxa2530-0000-000n00t435f 3000k s4 2990 3372 30h cxa2530-0000-000n00s430h 30f cxa2530-0000-000n00s430f t2 3200 3609 cxa2530-0000-000n00t230h cxa2530-0000-000n00t230f 2700k s2 2780 3135 27h cxa2530-0000-000n00s227h 27f cxa2530-0000-000n00s227f s4 2990 3372 cxa2530-0000-000n00s427h cxa2530-0000-000n00s427f t2 3200 3609 cxa2530-0000-000n00t227h CXA2530-0000-000N00T227F table 7: cxa2530 led order codes 10 m easured at 1 a, junction temperature (t j ) = 85 c xlamp cxa2530/cxa2540 retail track light reference design copyright ? 2013 cree, inc. all rights reserved. the information in this document is subject to change without notice. cree ? , the cree logo and xlamp ? are registered trademarks and easywhite? is a trademark of cree, inc. for product specifcations, please see the data sheets available at www.cree.com. for warranty information, please contact cree sales at sales@cree.com.
9 5. consider all design possibilities the design possibilities for an l e d-based track light are multitudinous. there are many ways to design the necessary heat sink that can dissipate the heat and ft within the desired envelope. one such heat sink is demonstrated in this reference design. there are also many ways to drive the led and design the refector and optics. carefully selecting a driver and working with a refector manufacturer to create an appropriate refector provided the performance necessary for a true 39- w cmh- equivalent retail track light. there are a number of desirable performance-related benefts in this design, which are results of the xlamp cxa2530 le d package. because the cxa2530 le d uses easyw hite? technology, led-to-le d color consistency can be held to within two or four m cadam ellipses for any given cct, depending on the order code. the cxa2530 le d is binned at 85 c, so the cct will be as faithful as possible to the system operating environment. these component features allow for new levels of specifcation accuracy. however, the primary purpose of this reference design is to show how simple and straightforward it is to design with crees xlamp cxa2530 l e d. this application note is not intended to show the only way to do this, but instead demonstrate the ease of implementation with this set of engineering constraints. certainly numerous other successful solutions are possible. track light manufacturers typically design a refector for a particular beam angle and install the light source and refector in multiple housings. this reference design supports such a process and in addition, the performance range of the xlamp cxa2530 led enables a wide variety of luminaires that all use a single cxa2530 led. for demanding retail applications, the cxa2530 l e d is offered in a 90-minimum cr i option, providing even better color rendering than this reference design. ccts from 2700 k to 5000 k and lumen output up to 5900 lm 11 are possible, providing the fexibility to offer a variety of luminaires that use a single led light source and refector. this fexibility is enhanced by the xlamp cxa2540 l e d, which has the same physical dimensions and optical source size as the cxa2530 and offers even more design possibilities. 6. complete the final steps this section describes the techniques used to create a working retail track light using the xlamp cxa2530 l e d and shows the results of the design. prototyping details the essence of the design is to attach a cree xlamp cxa2530 l e d to a heat sink and assemble the necessary optics and driver around this to create a true 39- w cmh- equivalent le d luminaire. the assembly steps are detailed below. 11 at 61 w , 85 c xlamp cxa2530/cxa2540 retail track light reference design copyright ? 2013 cree, inc. all rights reserved. the information in this document is subject to change without notice. cree ? , the cree logo and xlamp ? are registered trademarks and easywhite? is a trademark of cree, inc. for product specifcations, please see the data sheets available at www.cree.com. for warranty information, please contact cree sales at sales@cree.com.
10 1. we verifed the component dimensions to ensure a correct ft. 2. w e attached the cxa2530 l e d to the heat sink with a small amount of thermally conductive compound. 12 thermally conductive epoxy can also be used. 13 3. w e fed the driver output wires through the heat sink and, following the recommendations in crees soldering and handling application note for the cxa family of leds 14 , soldered them onto the cxa2530 le d. 4. we tested the connection by applying power to the led and verifed that the le d lit up. 5. w e placed a plastic alignment ring 15 over the l e d and positioned the ring so the le d was centered on the heat sink. 6. w e secured the plastic alignment ring to the heat sink with screws. 7. w e secured each end of the driver to the heat sink with a bracket and screw. 8. w e fed the driver input wires through the center hole in the screw-in base. 9. w e screwed the base to the heat sink, enclosing the driver. 10. we placed the refector in the heat sink so the opening aligned with the le d. 11. we placed the cover glass on the refector and screwed the front optic cover ring to the heat sink to secure the cover glass and the refector to the heat sink. 12. w e attached the track adaptor bracket to the lamp assembly with decorative screws. 13. w e connected the driver input wires to the track adaptor. 14. we performed fnal testing. 12 dow corning thermally conductive compound, tc-5026, www.dowcorning.com/content/publishedlit/11-1689a-01.pdf 13 r efer to crees chemical compatibility application note for compounds that are safe to use with cree l eds. cree xlamp le d chemical compatibility application note, ap63, www.cree.com/products/pdf/xlamp_chemical_comp.pdf 14 cree xlamp cxa family leds soldering and handling, application note ap74, www.cree.com/xlamp_app_notes/cxa_sh 15 m odel pc, m ekoda o ptical co., ltd., www.mekoda.cn optical copyright ? 2010, cree, inc. cree proprietary & confidential pg. 10 ? it is very difficult to crate a narrow beam optics for a large light source such as cxa2530 ? a custom reflector had been made by nata to achieve a 16deg beam angle (fwhm) ? reflector dimension: opening = 110mm dia , source = 21mm dia , height = 21mm ? can be use with cxa2520 as well. ? optical efficiency ~ 89% ? supplier: nata ( http://www.nata.cn/ ), model: 4 - 1361 -1 ? we also used an plastic mounting / alignment ring by: mekoda xlamp cxa2530/cxa2540 retail track light reference design copyright ? 2013 cree, inc. all rights reserved. the information in this document is subject to change without notice. cree ? , the cree logo and xlamp ? are registered trademarks and easywhite? is a trademark of cree, inc. for product specifcations, please see the data sheets available at www.cree.com. for warranty information, please contact cree sales at sales@cree.com.
11 results thermal results w e measured the thermal performance of the retail track light by attaching a thermocouple to the xlamp cxa2530 l ed mounted to the heat sink. the t sp of the cxa2530 retail track light was 63.5 c. based on the measured solder point temperature, the t j can be calculated as follows. t j = t sp + (led power * led thermal resistance) t j = 63.5 c + (42 w * 0.8 c/w) t j = 97 c this thermal performance is in line with the thermal simulation. estimated led lifetime based on thousands of hours of long-term testing of the xlamp cxa2011 l e d at higher temperatures than the measured 63.5 c t sp in this reference design, cree expects an l70 lifetime for this retail track light signifcantly longer than the 50,000- hour goal. 39- w cm h lamps typically have lifetimes ranging from 10,000 to 12,000 hours, so the 4 to 5 times longer lifetime of the cxa2530 retail track light offers compelling maintenance cost savings. optical and electrical results w e obtained the results in table 8 by testing the retail track light in a 1.5 - meter sphere and a type a goniometer after a 60- minute stabilization time. 16 the performance meets or exceeds the project goals and accomplishes this using a single xlamp cxa2530 le d to produce a symmetric 16 beam with cbcp exceeding 20,000 cd. characteristic unit result light output lm 3211 light intensity - cbcp cd 20,470 beam angle - fwhm degrees 16 luminaire effcacy lm/w 75.5 cct k 3048 cri 100-point scale 80 power w 42.6 power factor 0.95 table 8: cxa2530 retail track light results we also tested the intensity distribution of the cxa2530 retail track light. as shown in figure 6, the retail track light has an even intensity distribution for the narrow beam angle. 16 testing was performed at crees shenzhen technology center. an ies fle for the retail track light is available on the cree website: www.cree.com/xlamp_app_notes/cxa2530_track_ies xlamp cxa2530/cxa2540 retail track light reference design copyright ? 2013 cree, inc. all rights reserved. the information in this document is subject to change without notice. cree ? , the cree logo and xlamp ? are registered trademarks and easywhite? is a trademark of cree, inc. for product specifcations, please see the data sheets available at www.cree.com. for warranty information, please contact cree sales at sales@cree.com.
12 figure 6: goniometric intensity polar plot of cxa2530 retail track light table 9 shows the center beam illuminance of the cxa2530 retail track light at various distances from the light source. height center beam illuminance beam width vertical spread horizontal spread 0.5 m 1.7 ft 7,371 fc 79,337 lx 15.2 cm 0.5 ft 15.2 cm 0.5 ft 1.0 m 3.3 ft 1,843 fc 19,834 lx 30.5 cm 1.0 ft 27.4 cm 0.9 ft 1.5 m 5.0 ft 819 fc 8,815 lx 42.7 cm 1.4 ft 42.7 cm 1.4 ft 2.0 m 6.6 ft 461 fc 4,959 lx 57.9 cm 1.9 ft 57.9 cm 1.9 ft 2.5 m 8.3 ft 295 fc 3,173 lx 73.2 cm 2.4 ft 73.2 cm 2.4 ft 3.0 m 9.9 ft 205 fc 2,204 lx 88.4 cm 2.9 ft 88.3 cm 2.8 ft table 9: cxa2530 retail track light center beam illuminance C 16 beam angle conclusions this reference design demonstrates the ease of integrating the cree xlamp cxa2530 l e d into a retail track light with excellent results. such a luminaire is useful in both retail and residential spot light applications, where enhancing the appearance of merchandise or artwork is desirable. the performance of this retail track light makes it an attractive alternative to c m h-based luminaires and could form the basis for a broad product line of cxa2530 le d based track ? ?? ?? ?? ? go gogo go ? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ? ? 1 1 1 1 ? ?? ? 8 8 8 8 ? ?? ? ? ? ? ? ? ? ? ?? ? ? ? ?? ? ? ? ? ? ? ? ? ? ? ? ??????????? ?? ?????????? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?? ? ? ? ? ? ? ? ? ? ?? ? ?? ?? ?? ? ? ?? ? ?? ?? ?? ?? ?? ? ????????????????????????????????????????? ? ?? ?? ?? ?? ?? ?? ?? ? ????????????? ? ?? ?? ?? ??? ??? ?????? ???? ???? ??? ??? ??? ? ?? ? ??? ???????????? ? ?? ? ??? ????????????? ? ?? ? ??? ????????????? ? ?? ? ??? ????????????? ? ?? ?? ?? ?? ?? ?? ?? ? ?????????? ? ?? ? ? ???? ????? ????? ????? ????? ? ? ? ? ? ?? ? ? ?? ? ? ?? ?? ?? ?? ?? ?? ?? ?? ?? ? ? ???? ? ?? ? ????? ???? ? ? ? ? ?? ?? ?? ?? ?? ?? ?? ?? ?? ? ?????? ????? ????? ????? ????? ???? ???? ???? ???? ??? ??? ? ?? ? ? ? ?? ? ? ? ? ? ?? ? ? ? ?? ? ? ? ? ? ?? ? ???????????? ? ? ??? ? ?? ? ??? ? ?? ?? ?? ? ? ???? ? ? ? ? ?? ?? ?? ? ? ? ?? ? ? ? ?? ?? ?? ? ? ?? ? ??? ? ?? ? ???? ? ? ? ? ??? ? ?? ?? ?? ? ? ???? ??? ? ?? ? ? ? ?? ?? ?? ? ??? ? ?? ?? ?? ? ??? ???????????? ????????????? ??????????????? ????????????????? ????????????? ????????????? ? ? ????????? ?? ??? ??????? ? ????? ????? ????? ?????? ? ?? ?? ?? ? ??? ???? ???? ???? ???????? ???????? ???? ???? c cc c ? ?? ? ? ? ? : : : : 0 00 0 ? ?? ? ? ? ? ? 360 360 360 360 ? ?? ? c cc c ? ?? ? ? ? ? : : : : 15 1515 15. .. .0 00 0 ? ?? ? ? ? ?? ? ? ? ? : : : : 0 00 0 ? ?? ? ? ? ? ? 180 180 180 180 ? ?? ? ? ? ?? ? ? ? ? : : : : 1 11 1. .. .0 00 0 ? ?? ? ? ?? ?? ?? ? ? ?? ? : : : : ? ?? ?? ?? ?? ?? ? : : : : ? ?? ?? ?? ? ( (( (everfine everfine everfine everfine) )) )go gogo go? ?? ?2000 2000 2000 2000a aa a_ __ _v vv v1 11 1 ? ?? ? v vv v2 22 2. .. .0 00 0. .. .267 267 267 267 ? ?? ? : :: :23 2323 23 F ? ?? ? : :: :50 5050 50% %% % ? ?? ?? ?? ? : :: :5 55 5. .. .000 000 000 000 [ [[ [k kk k= == =1 11 1. .. .0000 0000 0000 0000] ]] ] ? ?? ?? ?? ? : :: :candy wong candy wong candy wong candy wong ? ?? ?? ?? ? : :: :2012 2012 2012 2012? ?? ?10 1010 10? ?? ?29 2929 29 : :: : ? ?? ?? ?? ?? ?? ?? ?? ? ? ?? ? c cc c: :: :\ \\ \documents and settings documents and settings documents and settings documents and settings\ \\ \ledit ledit ledit ledit\ \\ \desktop desktop desktop desktop\ \\ \ ? ?? ? \ \\ \cxa cxa cxa cxa2530 2530 2530 2530track track track track_ __ _20121029 20121029 20121029 20121029. .. .gos gos gos gos xlamp cxa2530/cxa2540 retail track light reference design copyright ? 2013 cree, inc. all rights reserved. the information in this document is subject to change without notice. cree ? , the cree logo and xlamp ? are registered trademarks and easywhite? is a trademark of cree, inc. for product specifcations, please see the data sheets available at www.cree.com. for warranty information, please contact cree sales at sales@cree.com.
13 lights. this document is meant to show that this level of performance is achievable with a single xlamp cxa2530 l ed component, and is meant to suggest that the cxa2530 l e d can be the basis of numerous successful track light designs. to further demonstrate this point, the appendix describes the even better results obtained when we subsequently replaced the xlamp cxa2530 le d in this retail track light with the xlamp cxa2540 le d. special thanks cree would like to acknowledge and thank the following partner companies for collaborating in the successful prototyping of this track light. ? energy r ecovery products - www.erppowerllc.com ? nata lighting company limited - www.nata.cn bill of materials component order code/model number company web link alignment ring pc m ekoda o ptical co., ltd. www.mekoda.cn driver erp040w -1000-39 energy r ecovery products, inc. www.erppowerllc.com heat sink/housing, cover glass, screw -on base, front optic cover ring kit gd120-01 losiwang www.loswan.cn led cxa2530-0000-000n00t230h cree, inc. www.cree.com/cxa2530 refector 4-1361-1 nata lighting company limited www.nata.cn thermally conductive compound tc-5026 dow corning corporation www.dowcorning.com/content/ publishedlit/11-1689a-01.pdf table 10: bill of materials for cxa2530 retail track light xlamp cxa2530/cxa2540 retail track light reference design copyright ? 2013 cree, inc. all rights reserved. the information in this document is subject to change without notice. cree ? , the cree logo and xlamp ? are registered trademarks and easywhite? is a trademark of cree, inc. for product specifcations, please see the data sheets available at www.cree.com. for warranty information, please contact cree sales at sales@cree.com.
14 appendix the introduction of the cree xlamp cxa2540 l e d expands the possibilities for this retail track light. to demonstrate the performance available from the cxa2540 l e d, we replaced only the le d in the cxa2530 retail track light. the le d in the original track light was from the highest cxa2530 3000 k fux bin and its replacement, shown in table 11, was from the highest cxa2540 3000 k fux bin. color cct range base order codes min. luminous flux @ 1100 ma 2-step order code 4-step order code group flux (lm) @ 85 c flux (lm) @ 25 c* chromaticity region chromaticity region easywhite 4000k v2 4230 4730 40h cxa2540-0000-000n00v240h 40f cxa2540-0000-000n00v240f v4 4545 5083 cxa2540-0000-000n00v440h cxa2540-0000-000n00v440f w2 4860 5435 cxa2540-0000-000n00 w 240h cxa2540-0000-000n00w240f 3500k u4 3955 4423 35h cxa2540-0000-000n00u435h 35f cxa2540-0000-000n00u435f v2 4230 4730 cxa2540-0000-000n00v235h cxa2540-0000-000n00v235f v4 4545 5083 cxa2540-0000-000n00v435h cxa2540-0000-000n00v435f 3000k u4 3955 4423 30h cxa2540-0000-000n00u430h 30f cxa2540-0000-000n00u430f v2 4230 4730 cxa2540-0000-000n00v230h cxa2540-0000-000n00v230f v4 4545 5083 cxa2540-0000-000n00v430h cxa2540-0000-000n00v430f 2700k u2 3680 4115 27h cxa2540-0000-000n00u227h 27f cxa2540-0000-000n00u227f u4 3955 4423 cxa2540-0000-000n00u427h cxa2540-0000-000n00u427f v2 4230 4730 cxa2540-0000-000n00v227h cxa2540-0000-000n00v227f table 11: cxa2540 led order codes testing of the cxa2540 retail track light yielded the results shown in table 12. o perating at the same 1 a current as the cxa2530 track light, the cxa2540 track light provides a 16% increase in lumen output and a 14% increase in light intensity. its 21% increase in luminaire effcacy makes it excellent at highlighting merchandise in retail displays. o ccupying the same footprint as the cxa2530, the cxa2540 offers an even broader range to a retail track light product line based on cxa2530 and cxa2540 leds. characteristic unit result light output lm 3740 light intensity - cbcp cd 23,367 beam angle - fwhm degrees 17 luminaire effcacy lm/w 91 cct k 3000 cri 100-point scale 80 power w 41 power factor 0.95 table 12: cxa2540 retail track light results xlamp cxa2530/cxa2540 retail track light reference design copyright ? 2013 cree, inc. all rights reserved. the information in this document is subject to change without notice. cree ? , the cree logo and xlamp ? are registered trademarks and easywhite? is a trademark of cree, inc. for product specifcations, please see the data sheets available at www.cree.com. for warranty information, please contact cree sales at sales@cree.com.
15 we also tested the intensity distribution of the cxa2540 retail track light. as shown in figure 7, the retail track light has an even intensity distribution for the narrow beam angle. figure 7: goniometric intensity polar plot of cxa2540 retail track light table 13 shows the center beam illuminance of the cxa2540 retail track light at various distances from the light source. the beam width is nearly identical to the cxa2530 retail track light beam width, with 14% greater center beam illuminance. height center beam illuminance beam width vertical spread horizontal spread 0.5 m 1.7 ft 8,378 fc 90,180 lx 15.2 cm 0.5 ft 15.2 cm 0.5 ft 1.0 m 3.3 ft 2,094 fc 22,540 lx 30.5 cm 1.0 ft 30.5 cm 1.0 ft 1.5 m 5.0 ft 931 fc 10,021 lx 45.7 cm 1.5 ft 45.7 cm 1.5 ft 2.0 m 6.6 ft 524 fc 5,640 lx 61.0 cm 2.0 ft 61.0 cm 2.0 ft 2.5 m 8.3 ft 335 fc 3,606 lx 76.2 cm 2.5 ft 73.2 cm 2.4 ft 3.0 m 9.9 ft 233 fc 2,508 lx 88.4 cm 2.9 ft 88.4 cm 2.9 ft table 13: cxa2540 retail track light center beam illuminance C 17 beam angle reliance on any of the information provided in this application note is at the users sole risk. cree and its affliates make no warranties or representations about, nor assume any liability with respect to, the information in this document or any l e d-based lamp or luminaire made in accordance with this reference design, including without limitation that the lamps or luminaires will not infringe the intellectual property rights of cree or a third party. luminaire manufacturers who base product designs in whole or part on any cree application note or r eference design are solely responsible for the compliance of their products with all applicable laws and industry requirements. xlamp cxa2530/cxa2540 retail track light reference design copyright ? 2013 cree, inc. all rights reserved. the information in this document is subject to change without notice. cree ? , the cree logo and xlamp ? are registered trademarks and easywhite? is a trademark of cree, inc. for product specifcations, please see the data sheets available at www.cree.com. for warranty information, please contact cree sales at sales@cree.com.

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