Someone could also wire them up to the interior lights so that they come on with the domes when you get into the car...the brightness and visibility would be very nice I think...
Only problem I can see is that I dont think they were made to go on and off, on and off all the time, but rather stay on for extended periods at a time...it will most likely shorten their lifespan...also probably can't wire them up for the dimmer mod either
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But hey they still look great in my opinion...of course I am also in the white light > blue light camp...