LED t5 grow tubes. Five, 4 footers plus a few 3 footers intersperced on each level. THe top level is an old T5 flourescent with 6 tubes which I really should retired. Hot and a bit much for anything but the peppers. Heh - the peppers think they're in Florida or someshit. The LED T5s are very nice, seems impossible to burn the plants.@wetwille What kind of lights are those?