Replies to my question:
George: It depends on the lenses in front of the lamp. With no lens, they may
be
emitting more light.
If you put a clear lens in front of them, they're probably just as
bright. However, a red or amber lens blocks blue light, reducing the
output. In this case a yellower lamp works better.
Don Hiscock: All marketing hype, IMO. The basic principle is that filters work
by
subtracting light. A dichroic filter to make the light bluer (and
hence whiter by their definition) does it by subtracting yellow- and
red-shaded light, not by adding more blue light.
So it's quite possble to be 15% whiter and lower brightness overall.
Seems almost unavoidable.
Thanks, George and Don. What you say makes sense. So maybe if I use the 1157s
in the front side-flasher lamps, and revert to the original white/clear lens
while I'm at it, I won't have completely wasted my money? Sigh....
--Andy Mace
*Mrs Irrelevant: Oh, is it a jet?
*Man: Well, no ... It's not so much of a jet, it's more your, er, Triumph
Herald engine with wings.
-- Cut-price Airlines Sketch, Monty Python's Flying Circus (22)
Triumph 10 / Herald / Sports 6 vehicle consultant, The Vintage Triumph
Register: http://www.vtr.org
Check out the North American Triumph Sports 6 (Vitesse 6) and Triumph Herald
Database: http://triumph-herald.us
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