Hi, I had a quick question. I have a 150w sun system in a 4x2x5 tent. S&P TD-Silent 150s Fan on high speed, 2 clip on fans blowing. 1 on bulb, 1 just over canopy. The 150 sun system is 4-5 inches from plant tops, temps are 77-79 ( I have the temp gauge hanging from light 4-5 inches below light) Now, the 150 watt system is not running hot at all. With the fan pointed at the bulb and running the air out, to touch the ballast area it is just a little warm. The Bulb area is fine with the fan blowing directing on bulb. The Upper tent temp is 77. So The 150 watt at 5 inches above plants doesnt light the whole 4 foot tent, maybe half. It will light the tent if I raise the bulb higher, but im trying to keep it at 6 inches above for more light on the plants. So i want to add another 150 for the other 2 foot side of the tent, or a 250 watt. so 2 150's, or 150w and a 250w --- question i need help with is temp. How much will a 250w raise the temp. I think another 150w is doable, I think a 250 might be doable to, the fan is a nice fan hooked to a small phat filter inside the tent. The TD-150s is on high. The grow is in a basement where the temp can go down to 66 at night currently.. the temp outside the temp is probally 68. What do you guys think about the temp increase with adding another light, I can add a few more clip on fans to blow on those lights also... Thanks Currently growing in tent are 3 Barney Farm Blue Cheese. (on veg) Currently in Veg Cabinet, 2 Nirvana Northern Lights, 2 Barneys Farm Blue Cheese, 3 Nirvana N.L. Clones