FWIW, I use HP LED's for custom motorcycle lighting. Their web site has lots
of information on where folks are using them. Haven't worked on filament
monitoring yet - a bit of overkill on a bike (especially since the local
constabulary will usually tell you if there's a bulb out ;))

http://www.hp.com/HP-COMP/tran/Lite.html

The "square" ones are really cool. Super bright and used in many brake
lights.

-DO