i like em.. my main room gets the air exchanged in it 2x a min and my 5x5 tent gets the air exchanged in it 4x a min no problems here .. temp in the summer barely went over a 90 and in the winter im lucky 2 c 85
no light rail.. just two 4 ft parabolic hoods stationary over the canopy wit two 1000 watt quantum ballasts wit the lights on the yoyo type hangers by sunmaster i think which allows me to raise them when i need to work and lower them to canopy level when im done.. check out the perpetual link...