Rediculous Heat Problem, Help Me please!?

I'm growing in a cabinet about 6 feet tall, 3 feet wide, and 2 feet deep with a 400WATT HPS and the temps just will not stay in the range of 70-80.

I have the top of it pretty much all cut out, with a 20inch window fan pushing air out and a 10inch oscillating fan practically touching the HPS. The entire bottom of the box is cut out to supply air also.

The weirdest part is that when I open the doors the temperature barely drops at all, and at night is when they're highest. The temperature has ranged from 75-90, what the hell should I do?

if you have the thermometer in the sunlight of the light it will give you a false higher reading I believe,

try putting in a shade part of the box. maybe someone else can elaborte if I am right?

Are you venting the heat out of the area? Most people use ducting to take the heat out of the growing area. By out of the area I mean so that the warm air cannot be sucked back in passively.

You could also try a cool tube or a vented reflector. That worked for me.

Panda, that makes sense to me, anyone else experienced something like that?

Tanuvan, yes I'm venting the air out of the box.

Glockstar, its ridiculous that the temps are that high isn't it? Its so goddamn frustrating, forgive my language

If I can't get anything to work I guess I will have to get a 250Watter, anyone wanna trade theirs for a 400Watt plus a little cash haha? I probably should have just bought a cooltube.

Before some suggests this, the ballast is already outside of the cabinet.

My friend has enough trouble keeping his box of the same size at acceptable temps with at 250W HPS. Large case fan pulling air out of the lamp/reflector and it has cool glass. Still hitting 85 degrees if doors are sealed shut...

If it's only going up to 90, you don't have anything to worry about. It might not be the optimal temperature but it certainly won't hurt them. My grow cabinet stays about 90-92 and my plants are growing an inch a day and couldn't be healthier.

The room temperature never goes over 75 panda. A 250Watt is only $20?

thats not a grow box, thats an easy-bake oven

throw in some eggs and brownie mix and presto.

Oh man, you guys are funny.

what better to cook than weed brownies

yep, just $20.00 for a 250w hps bulb at Menards I just bought one there last week.

You have to wire it yourself don't you?

I've seen a nice temperature drop since I moved my thermometer into the only shade in the cabinet. It seems I might be alright.