Reload this Page 90+ DEGREES! in 800w Super Lemon Haze Closet Grow

I have just added my second 400watt HPS light to my 2'wx7'wx8'h closet grow room. I am in my first week of flowering my 4 Super Lemon Haze plants. The attached diagram has all the info on the grow. My problem is my room gets up to 93 degrees during the day. The ambient house temperature is always 76 degrees. Do I need more fans? Or do I need a dedicated fresh air intake for the lights from the bedroom? Any help would be greatly appreciated!

Also, my plant on the far right appears to have started wilting. Would that be due to the heat?

move the ballasts outside growing space,raise the lamps to 12''
my two..

yea man..
you gotta get the heat down asap

i would hate to see your plants die due to high heat

i would suggest getting fans and venting the area
and to keep your closet open while doing so.

after looking at your drawing, i would loos the y adapter going into the fan and draw air through the lights only. the inlet into the first light should be a short piece of hose that points up and is kind of close to the ceiling so that it draws the air from the highest point (heat rises).

other things that you can do (and i did with success)

1) add thermal blankets to your lights so that heat is never raidiated into the room in the first place.

2) get teh ballast out of the room or move it into the path of flowing air so that the heat is drawn out rather than letting it collect somewhere.

3) make sure gaps under doors etc are wide enough to let the air in. you may need a 1" gap under your door, for example. calculate the area of a circle (your duct size) and compare that to th area of the gap at the bottom of the door.

get into the room with the fan on and close the door. try to get a feel for the air flow in the room and make sure that no air is being drawn in from teh attic. i had to insulate teh back of my attic access which was just a sheetrock cut out. this really helped as well beacause heat was just pouring in before becuase it was uninsulated.

it is not clear that you need the booster fan on the inlet. i would try to get rid of it if not needed. also make sure the ducting has smooth turns and no blockage.

Now my two plants in my right bucket are wilting? Is it due to heat? Or could it be a salt buildup from the nutrients? I'm using Advanced Nutrients Micro, Grow, Bloom, and Carboload

Ive got a couple of suggestions if viable.

1) Move your 300cfm to the the other side by the shelf with ballasts and switch the way you are flowing air over your lights (make it l to R) move other fans to oppisite side also.

2) use the Y adapter and place the opening next to the ballasts so the hot air is not allowed to radiate. it will get sucked right into the fan.

3) use the 6'' booster fan to circulate air (not push air through lights). It could be causing POSSITVE pressure out of the open ended Y, spewing heat back into your cab

4) If you cant move the 300cfm fan, still loose the booster and use for circing. Buy 2 120mm pc fans and exhaust directly above your ballasts.*

*I did this in my closet and used a "stack" to trap radiating ballast heat and exhaust it straight up into my attic. Check journal in my sig for pics.

I did #4 in my closet and it dropped the temps 8 degrees almost instantly!!!


Get back and let me know if any of these things worked!!!

thanks everyone. When I get home today i'm going to cover the open end of Y Exhaust fitting, so all my venting goes through my lights and out into my attic. Hopefully this helps me get down to a reasonable temperature

I just started using a cool tube, and it has solved all of my heating, cooling, and exhaust needs, and I can put the light right down to the tops of my plants now. I am using a 400w hps.

Cooltubes ROCK!!! got one and LOVE it!!!!!

if your running your 12 hours of light during the day, you may want to consider switching it to night.just give em 24 hours dark an then make the switch.

I had to do this and it evened out the day heat and the nightly drop pretty well.