>I've also noticed that more and more vehicles,  particularly on trucks,
 >are using LED taillights.

Checkout Craig Johnson, My Friends website,
and see what he put on his Rascal Scooter and (Power Chair)!
http://ledlights.home.att.net/how.htm
http://ledlights.home.att.net/how2.htm
http://ledlights.home.att.net/how3.htm

Then go to His LEDLIGHT MUSEUM and TESTING AREA.
http://ledmuseum.home.att.net/ledleft.htm

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