For what it's worth, the inside of my dome is black as well, but until now I've survived in just a red LED headlamp and a red/white switchable torch, however, I have just bought an Arlec rechargable camping lantern (fluoro and LED) which I plan to use in the obs when we aren't camping. Should provide oodles of white light plus the fluoro gives me another calibration source for the spectroscope!
Al.