I've been doing that very thing, and I'm not sure how cold the air would have to be for that to be a negative instead of positive. All electrical equipment will perform better longer in cooler conditions. I guess if the cold air lowered the temp in your grow enough it could affect your plants, but it can't be anything but good for the light. Keep in mind that that outside air will be really hot in the summer, which won't provide much cooling, and may exacerbate heat issues. I've got 3200 watts of lighting, so that cold air (which has gotten down below 0 in the last month) only got my flower room temp down to 59. Good luck.
senorx12562 Reviewed by senorx12562 on . Air-cooled hood...can you pull too much air through? I just picked up an enclosed reflector with 6" air-cooling flanges. I just ordered a 6" inline fan that is rated to 200 CFM, but it looks like it only runs at 160 CFM. I don't think that'll be enough for my 1000W HPS. My other option was a 424 CFM fan!! That air would be fuckin roaring through the hood! If my nerd calcs are right (Q=VA), then the air would theoretically be coming through the hood at 36 ft/s (25mph). That's a pretty heavy gale. Could that be harmful to the electronics Rating: 5