Is it okay to have air blowing close to my halide bulbs? I plan to have 3 250 watt halides and 2 6’ VHOs over my 180. I’m thinking of placing three fans low on the back of the canopy blowing in to the front and locating them so that they blow below each of the halides. The top will have some slots or it may be semi-open for ventilation. Is there a better arrangement?

Is there a rule of thumb for how much CFM you should have blowing in?