a good friend of mine uses these crazy flouresent lights. they are on a 2 feet by 4 feet rack. there are 12 tubes per light rack. when he flowers he puts in two different uv bulbs and leeps the rest the same? he has great results. he keeps the lights about four inches from the plants at all times. there is no heat and they hardly use any power. has anyone else used this method? how were the results? is it worth it?