I can answer this as I have a 600 watter and I'm also doing closet grows with it. It gets hot. I invested in a cooltube and a CHEAP Lowe's inline fan. You don't need the expensive turbine fans. If you don't want to invest in the cooltube (It's worth it though, trust me), then just get a cheap strong fan and blow it across the light. That'll help to take care of the excess heat.