400w questions for dumbies

How far from foilage should the 400w hps be kept?

How many plants does the 55,000 lumen bulb cover?

How hot is really too hot? ( seems it gets a lot more heat outside then they say inside. 85 easy outside in summer in any local, but 75-78 is idea for indoor is whnt i know)

is a 4'' high volocity fan and carbon filter in room enough to contain odor's ?

i keep my 400 watt 2feet away from the plants perfect

I hang my about 6 inches above them till I run out of room. last time it grew past my lights so I bent em

18 " any closer and your at the point of diminishing returns . Just because it isn't burning your leaves doesn't mean some harm is being done . A good indication of being too close is the leaves will tilt upwards instead of being level and relaxed .

View attachment 1527962 Here this will help. Happy growing

I went with the 6in fan and filter and couldn't be happier. You can turn the fan down with a controller, you can have extra ductwork to get where you need to, i was able to stand in the cabinet and burn one without the odor escaping the cabinet. From what i've seen it seems higher end fans tend to be less aduible...guess you get what you pay for.
I went with the 6in vortex as it has 10 year warranty and pushes 450 CFM, ofcourse you have to get the little larger 6in carbon filter. I don't know if it is the brand, Phresh, or the size of the filter itself. True test will come when in full flower......Just a newbie trying to get a nug....