Well there are many diffrent lights to choose from. T-5, PC, VHO, MH. And I see what pontius is talking about They redesigned the T-5 light to put out mroe lumans than a VHO light and burn less electricity. But they are pricy I would just buy metal halides. Also the older T-5's arent like this and will be below PC and VHO so I would research alot and see what you want to keep and what kinda lights you need. Dont skimp on lighting!