I have a 18x18x24 zoomed. I started off lighting it with a 10 gallon aquarium hood with 2 screw in 65w cfl bulbs. Broms have lots of color and several pupped and plants grew like crazy. Even java took off under it. I now use a 4ft t5 shop light with 2 bulbs. Make sure you get 6500k bulbs no matter what way you go.