wat temp. do i need in a 80cm x 80cm grow tent

i hav 3 blue chesees 3vanilla kush . ther one week old. i have them under a 150 watt cfl the temp in the tent is 27.1c now. i wanted to change the light in the 3rd week to a 400watt hps would this light be too strong 4 the grow tent. wat is the ideal temp. 4 a grow tent. any advise is weclome this is only my second grow

26C is ideal for any grow room, unless you have a sealed and fed CO2 room, in which case ~29C is optimal. If you have a good fan and hood, you can definitely use a 400w HPS in that tent.

Hey mate, I have a 1mx1mx2m tent with a 400w in and temps range from 25-27c, how Tall is your tent? To keep my temps in check I have 2 fans blowing across my light to move the hot air, you could get one with a cool tube which would be even better at keeping temps down. Hope this helps a little.

You're going to have to move quite a bit of air through the tent with an inline fan to keep the temps below 85F while using the 400w.

Temps should be between 70F-85F.

thanks lads. the height is 1.6m. does the air hav 2 be fresh r can it be taken from the room the tent is in

budbell said:

thanks lads. the height is 1.6m. does the air hav 2 be fresh r can it be taken from the room the tent is in

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Fresh, like from the attic, a window, another room. Re-circulating air is not beneficial to plants as it restricts CO2 intake.