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Prelude: my box dimensions 1.6ft x 3.3ft x 4.2ft 170-190 CFM inline exhaust speed bully fan controller at half power ambient temp is 80-83 .. i live in a desert its scorching fucking hot right now. I even have my A/C at 78F!!! my room just happens to face the sun!
but at the local hydro shop I was looking at cooling hoods and the employee told me as long as I have a cool tube setup I really don't have to worry about the heat from the bulb. I was going to go with 150w. but that just seems dumb considering I have that in CFL's being used now. I touched the hood and it was cool to the touch so he wasn't bullshitting me but then again i don't know what CFM fan that display was hooked up to!
I have a 170 CFM inline exhaust with scrubber that I plan to soon hook up my bake a round pyrex cool tube too. but I'm totally stuck on what wattage to go with!!!??!?!
you would probably be good with a 400. i have a 600 in a cool; tube, and i can feel some heat coming off of it. a bigger air cooled hood would probably suit a bigger bulb better. but for 400 you should be fine.
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