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LED Industrial Lighting - Filament Replacement LEDs
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Faxback for notes and your requirements for the 238 Series:
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If you would like a quotation for the above requirements, please photocopy this sheet and fax it back to Marl International on:
FAX: 01229 585155
for a prompt reply
(c) MARL INTERNATIONAL LTD 2001 : DS 11/01 Issue 3
ISO 9001 : 1994 APPROVED
Fax: +44 (0)1229 585155
* email: sales@marl.co.uk * website: www.marl.co.uk * website: www.marl-leds.com * Telephone +44 (0)1229 582430
NEW PRODUCT DATA
Signalling Panel & Console Filament Replacement LED Technology
Fit and Forget LED Signalling Panel Indicators
* * *
MTBF: 100, 000 Hours (11 Years) Reliable: Flicker-free & shock resistant Railtrack Approved
LEDs:- offer greatly extended life and reliability in comparison to filament bulbs, in addition to reduced heat generation and power consumption. They are readily available in all the main signal and status defined colours and base styles, for immediate retro-fit.
LEDs
FILAMENT REPLACEMENT LEDs - T6.8SB Bi-Polar
* * * * * *
Dimensions in mm (Typical) Not to Scale
Direct replacement for T6.8 SB Resistant to shock and vibration Bi-Polar: ac/dc operation Massive reductions in maintenance costs Railtrack Approved ^ Flat-topped version available for increased viewing angle
238 SERIES Pack Size = 20
Ordering Information & Typical Technical Characteristics (Ta = 15 - 25C)
Mean Time Between Failure = 100,000 Hours. Luminous intensity figures refer to the unmodified discrete LED. PART NUMBER COLOUR LENS VOLTAGE AC/DC Vopr CURRENT lopr LUMINOUS INTENSITY Iv@20mA WAVE LENGTH p VIEWING ANGLE OPERATING TEMP Topr STORAGE TEMP Tstg
STANDARD INTENSITY
HIGH INTENSITY
238-501-98 238-521-98 238-532-98 238-930-98 238-997-98 238-501-93 238-521-93 238-532-93 238-930-93 238-997-93 UNITS Red Yellow Green Blue White Red Yellow Green Blue White Water Clear 24 24 24 24 24 28 28 28 28 28 Vdc 17 17 16 16 16 17 17 16 16 16 mA 2750 4500 6000 2000 3000 2750 4500 6000 2000 3000 mcd 660 590 525 470 * 660 590 525 470 * nm oC oC Narrow -20 ~ +50 -30 ~ +80
* = Typical emission colour: x = 0.31, y = 0.32. Colour temperature 8000K. Intensities (Iv) and colour shades of white (x,y co-ordinates) may vary between LEDs within a batch. ^ Railtrack Approval: PA05/697
SAMPLES AVAILABLE
Fax: +44 (0)1229 585155
*
email: sales@marl.co.uk
*
website: www.marl.co.uk
*
website: www.marl-leds.com
* Telephone +44 (0)1229 582430
TECHNICAL INFORMATION
OVERVIEW
Product Description Filament replacement LEDs have been available for many years, and there has been a transition from the use of multi-LED products to the use of high performance, high reliability single LED products. Marl has always been at the forefront of designing and manufacturing LED indicators for harsh and difficult environments with demanding performance expectations. The new 238 series LED lamp replacement allows the user to exchange the standard tungsten filament bulb to BS1050 or black-tip as it is sometimes known, with a high brightness low current consumption cool, reliable alternative. This follows extensive trials by Railtrack on Westinghouse M3 and M5 signalling panels and consoles. Internal circuitry specifically designed for rail applications allows for operation at either AC or DC voltages allowing polarity free replacement, and while also providing the benefit of not producing a distracting flicker, like some lower specification LED replacement devices when used on AC voltage supplies. With an MTBF of 100,000 hours, routine maintenance costs are minimised and overall system reliability and safety enhanced. Samples and technical support are now available upon request.
MATERIALS
Contacts Extension Sleeve LED Lens Nickel Plated Brass Acetal Water Clear Epoxy
APPLICATIONS
Replacement tungsten filament bulbs with the approved Marl 238 series eliminates maintenance costs and improves signal indication recognition by the signaller, improving safety. This is due to the cool running of the LED, which does not deteriorate the panel filter, obscuring visibility, while also the enhanced brightness and colour definition of the LEDs also increases this recognition. When used on a console within operator buttons, again the low heat generation does not cause the button to become brittle, eliminating the possibility of a fracture. Signallers also can now operate buttons that are cool to the touch, compared with tungsten bulbs. The trials have clearly shown that for white signal indications, the use of yellow LEDs provides the best visual performance compared to true white LEDs. Marl provide the full range of approved colours for use within signalling panels and consoles for rail use. The 238 series forms part of a family of bulb replacements available from Marl.
INTENSITY
The small physical size of an LED chip means that it can be regarded as a point source to a very good approximation. The light output of an LED is therefore expressed in terms of luminous intensity, which is defined as the flux, in lumens (lm), emitted per unit solid angle in steradians (sr). The SI unit of luminous intensity is the candela (cd).
RELATED DOCUMENTS
These products are designed and manufactured in the UK to International Quality Standard BS EN ISO9001 : 1994.
Telephone +44 (0)1229 582430 *
Fax: +44 (0)1229 585155
*
email: sales@marl.co.uk
*
website: www.marl.co.uk
*
website: www.marl-leds.com

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