i'm useing a lumatek 400, the whole package was 256 bucks at a local hydro shop, just switch bulbs from MH to HPS, silent, the ballast still a little warm, so its not in the closet, and with a 70 cfm ceiling fan its still to warm in my opinion, with the 400 watt so im upgrading my dishcharge fan and drilling more holes in the floor, in my bigger room i have dual 600 lumateks, everything is 240 to save on the power bill. the amperage on 240 is about half of 110 if that makes sense, what im trying to say you can almost run 2 lights on 240 for the same money as one light on 110 same wattage, people keep stressing to me dont think wattage,because the plants are thinking lumens, and there right!!! anyway the lumatek electric ballast claims to put out 20 to 30 % more lumens than standard ballast at the same wattage for half the money ? The plants sure like them but like i said they are warm in a closet, good luck on your grow