Have a look at the Rigid Industries Dually lights which are LED. They only draw 15 watts, have instant-on, and are incredibly rugged. We've sold quite a few of these.
Do a google search on them or PM if you have any questions. I've installed quite a few of these on GSA's.
07 R1200GSA - 81 R80g/s - 88 Hawk GT - 06 TW200 SuperDuper Tenere