Both my 10g have the canopies that take incadescent bulbs. Today I bought some flourescent spiral shaped bulbs at the hardware store that fit a regular socket. I put them in my canopies and they work great. I have a few live plants in each tank that is why I wanted the flourescent bulbs. They are 13 watt bulbs that are supposed to be equivalent to a 60 watt regular bulb. Is this too much for my tanks? At least they are not making my temperature rise like the incadescent ones did.