If you are thinking of growing some plants indoors LEDs might be what you are looking for. BVnursery has built some LED panels for growing plants and has had some great results.

“The target of the project is to develop an inexpensive, effective method of providing light to plants using only leds. This unit is designed to light standard horticultural starter trays measuing 10 x 20″.

The logic follows several paths. Almost zero heat, almost zero waste due to proper spectrum choices, light weight and therefore very versitile. Unit cost has been a monumental hurdle and has been pretty well solved. Using unbinned parts has been an intergral part of the cost savings at the cost of simply adding a pot to each string.”