Actually I tried one of those coil bulbs with the dome light that I have but it would not fit. The bulb was too long and I just sit the dome ontop of the screen instead of clamping it to a clip. Ive been using a 60W daylight sunglow bulb by exo-terra and a 75W Moon glow bulb by exo-terra at night. Would those work for the geckos. I may not use a moon glow at night so it can have more of a night time temperature drop. What do you think?