Refugium Light
I use CFL's in simple fixtures. My bulbs are a 75w equiv, which actually grows my chaeto a little too fast (it grows really fine), have to throw out about 1 packed gallon sized ziplock every month. If your reptile light is a clamp on, it will do well, but if its the type that has the bulb sideways in a mini canopy, get a clamp light. I had a hood style light over my small fuge with the exact same bulb as my bigger system, and didn't grow we'll at all. Not sure why, but changed over to a $5 clamp on cheapie, and all was back to normal.