Hello all, I am new to this forum and dont really post on any forums so here we go. Thanks everyone for all of the information on this subject. Here is my situation and i would appritiate anyones two pennies. After i start building my setup I think i might actually keep a journal here so anyone can learn from my mistakes. I am building a large grow room in the basement of a house in colorado to house 96 to 99 plants. I am pretty sold on the rasta grow ebb and flow system and using a water cooled co2 generator. If i go the HPS route I will hang 12, 1000 watt lights on movers with 8inch cooling ducts and pump the air through them to try to get a head start on keeping the room cool. I will also need a seperate airconditioner just for the basement. Thats around 80 watts per plant If i go the LED route I plan on having 12, 300 watt (the guys who make the lights say 300 watts equals 1000 watts hps... i find that hard to believe) lights on movers. I also plan on using 36, 28 watt (allegedly equal to a 250 watt hps) lights to come in from the sides to make sure there are no shadows anywhere because i know the LEDs wont get thru like HPS will. I also plan on suplimenting this with cool white florecents at various places. The leds alone around about 48 watts per light. I guess the total cost to start up will be a little more with the LEDs but when you factor in all the duct work, and the extra air conditioner it gets a little closer. Then after a few months of factoring the electric bill and the LEDs look cheeper. I just wonder if the yeild would be terrible. I have seen comparisons of 1 UFO vs 1 400 watt hps... and for the most part the hps wins (i did read one in a high times where the UFO was only 5 percent behind in yeild) I guess I am wondering if anyone has ever done a comparison of 1 hps vs 2 or 3 leds and some floros. I know that that is 1 light getting ganged up on by a few lessor lights... but it might be closer in a watt to watt comparison. I figure this way I am only spending electricity on making light... insted of making light and heat, and then moving the heat out of the house because i didnt want it in the first place. Makes sense right? Could that 5 percent shortage, or the much bigger shortage shown by rump, and some other people, be made up with tons of LEDs.... or is it still all about the HPS? Thanks everyone for your opinions.