On Feb 23, 2010, at 2:27 PM, Tony Duell wrote:
I see them in
tailights for buses and trucks also. They have a
somewhat different color (narrower spectral distribution) than
filtered incandescent lamps.
LED clusters are very common as lights on buses in London. In fact the
first place I saw white LEDs being used was the reversing light of
a bus.
The turn indicators (cluster of yellow LEDs) have a curious property.
When they turn off, one LED stays on for considerably (1s or so)
longer
than all the others. It's the same LED on all indicators, so it
must be a
design feature, but I wonder what the reason is.
I've heard lots of people talk about how disconcerting the abrupt
turn-off of "those weird new traffic lights" is. I'll bet that has
something to do with it.
-Dave
--
Dave McGuire
Port Charlotte, FL