Their degree of directionality depends on the lens that is molded into
the LED. You can select all different spreads, some lens are even
aspherical. Of course the higest INTENSITY ones put all their power
in one direction. LEDs would seem to be nearly ideal for aircraft
application because they're vibration proof, extremely long life, soft
failure, energy efficient (light/watt), simple to drive.

osit (RobertR237) wrote in message ...
In article , "Robert Little"
writes:


You are right about that, but the new lights on the tractor-trailer rigs
sure seem bright enough and no maintenance. RTL


It's not the brightness issue so much as the spread. Look at the regulations
on the required viewing angles and maybe you will understand. The LED's are
unidirectional and could cause a problem meeting the regulations. If you will
note, those truck lights need only be seen from behind and traffic signals
benefit from not having too wide a viewing angle.


Bob Reed
www.kisbuild.r-a-reed-assoc.com (KIS Builders Site)
KIS Cruiser in progress...Slow but steady progress....

"Ladies and Gentlemen, take my advice,
pull down your pants and Slide on the Ice!"
(M.A.S.H. Sidney Freedman)