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238-501-98 Datasheet(PDF) 4 Page - Marl International Limited

Part # 238-501-98
Description  FILAMENT REPLACEMENT LEDs - T6.8SB Bi-Polar
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Manufacturer  MARL [Marl International Limited]
Direct Link  http://www.leds.co.uk
Logo MARL - Marl International Limited

238-501-98 Datasheet(HTML) 4 Page - Marl International Limited

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TECHNICAL INFORMATION
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
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
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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.
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.


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