If you get a fair bit of sun, then there is no reason you shouldn't be able to tap into the suns heating power. I have read information about how much solar energy strikes the earth on a sunny day. I think it's around 1kw equivalent per square meter.Originally Posted by rfeiller
As for lighting, I think your best alternate for lower power usage would have to be LED, color corrected to the specific spectrum you need placed very closely to the plants.