On Wed, 4 Jul 2001 11:01:12 -0400 Spehro Pefhany <speff@INTERLOG.COM>
writes:
> Also, as indicators, most of them are monochromatic (traffic
> signals, brake
> lights on buses), where most of the energy from the incandescent is
> wasted
> in the filter.


        Another clever thing on some LED traffic lights...  Those lights that
have an arrow (like a green arrow for a left turn) have the LEDs arranged
to make the arrow. An incandescent, of course, is behind a mask in the
shape of the arrow so only a fraction of the light gets out. The LEDs
just don't generate the light where it is not needed.

Harold

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