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From: firstname.lastname@example.org (Don Klipstein)
Subject: Re: Best way to power array of LEDs?
Date: Sun, 6 Oct 2002 05:19:45 +0000 (UTC)
Organization: MGT Consulting
NNTP-Posting-Date: Sun, 6 Oct 2002 05:19:45 +0000 (UTC)
User-Agent: slrn/0.9.6.2 (SunOS)
In , Jim Yanik wrote in part:
>Are there LED direct-replacement bulbs for brake lights and turn
Just to confuse some with some facts:
There are LED "direct replacement" bulbs. Same base, same design
voltage, and a nominal industry standard part number of the incandescent
lamp that they are designed to replace.
Problems likely to come up:
1. Light output is usually a lot less. Often so much less that you
even have less compared to the "equivalent" incandescent filtered to
the LED's color.
2. Light distribution pattern is usualy different.
3. Light source location/dimensions are almost certainly different.
All three of these can cause trouble with using such "bulbs" to replace
incandescents in motor vehicles. Items 2 and 3 generally result in optics
of the fixture directing light in a bad pattern, resulting in insufficient
light output into some directions to meet DOT-specified lower limits of
light output in some directions. There is even a possibility of having
light output in some directions exceed upper limits specified in the DOT
specifications, especially if total light output is adequate or nearly
Problem is, automotive lighting fixtures (taillamps, brake lamps, etc.)
are designed to work with a certain standard shape and size filament in a
position defined so precisely that merely having a proper filament 3
millimeters out of place or oriented differently from "usual" by 45
degrees may cause the fixture to fail to comply with standards it has to
- Don Klipstein (email@example.com)
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