I'm making the assumption you are referring to the driving lightbar,
I have a Cobra lightbar with these bulbs.
The spotlights are GE H7616 they only use 36.5 watts and put out 70000 CP. Lights up the road very well. I replaced 55 watt bulbs with these.
I think it was Warlock from MS that put me on their trail.
http://www.atlantalightbulbs.com/ecart/nw012104/GEH7616GENERALELECTRIC.htm