I've removed the compact fluorescent bulbs and replaced them with some LED bulbs I got at Home Depot. They too can run on 100V DC with no bother at all. The good thing about LEDs is that they come on instantly unlike the CF bulbs which take their sweet time to shine brightly. I was amazed at how the CFs lasted despite being shaken about during normal driving. They didn't fail. I should have no worries about the LED bulbs.