Bought a similar hid bulb and it ran too hot with a 4" 190cfm exhaust fan in my 32x32x63 tent, even with air coming in at the bottom. Keep in mind that mine is a stealth grow, especially with regards to noise, thus the reason for only a 4" size exhaust fan. I'm limited to cfl's and led panels mainly because the heat extraction just isn't great with a 190 cfm exhaust fan. They're good for led's and cfl combos tho, noise and temp wise. I got a pretty decent stoney crop, tho it was only a one plant grow. I don't smoke a lot of weed.