For the life of me can't figure out what else to do to get my temps down

[Xenonrae]

3x3x5ft Tent.
400cfm inline exhaust fan.
600W hps in a blockbuster reflector (turned down to 75%~450W)
passive intake with a box fan blowing fresh air from an open window into the tent.
Fan placed inside the intake hole and vent(with carbon fabric to prevent light leaks out)

 

[millertm]

So, you need to move more air. I pump 560cfm into tent directed at floor

It is 6" M-6 560 or 590

Then carbon filter on 6" 440crm ducted out window.

Passive intake will not keep tent cool with bb. You need to push air into tent, duct it out a window and keep room under 70 deg. My tent will spike 8 to 10 deg above room temp while fan kicks on, fan on at 74, off at 72, but it climb's fast. When room is very cold fan stays off 5 min or so, run's about 15 min. My tent sees high of 79 for peak temp. I have better pix on my grow log. Look early on for detailed shots.

Cheers

 

[millertm]

Also, way to much bending on duct work and ducting needs to be pulled tight.

 

[Xenonrae]

I scrapped this setup, went LED with no extra ducting or anything.

 

[millertm]

Ok, but watts eq heat, while LED have better spectrum, they run much lower power. Watt for watt such as Kind LED run hotter then bare bulb. But glad you got your tent in control.

Cheers

 

[Xenonrae]

Thanks! I grabbed a 1200 watt from Mars(not the cob style, those generate a ton of heat) but it equals out to a true wattage of ~545-585, which is pretty close to 600W of HPS(and I only had it turned to 75%, and it was already way too hot- i couldnt imagine running it at actual 100% all the time, would get way too hot.

 

[LEPflowers]

You can cool the tent by balancing cfm and intake temp. It will never cool less than the temperature that is comming in and you will probobally want a 5-10 degree difference between target temperature and temperature of incoming air. If you are unable to do that you can get a water chiller and put the cold water through a radiator in front of an intake fan. I believe hydro innovations makes these. They easily hook up to ducting runs and fans for spot a/c.

If you had co2 and a dehumidifier you would be able to do this. Do you have more room next to tent? Perhaps making a sealed box that is 150cubic ft or more as a lung room. Duct between it and the tent. Use a water chiller ac and filter between the 2. Stick heater humidifier dehumidifier and co2 in the lung room.

 

[LEPflowers]

Millertm, what size tent are you in. I like the idea to point it at the floor. What is the temperature of incomming air?

 

[Buckshot317]

I've had mine up to 96 in summer time, as long as air is moving won't hurt ( some strains like it hot), don't listen to people that say it has to be 70 or 75. If that was the case you couldn't grow outdoors

 

[millertm]

Millertm, what size tent are you in. I like the idea to point it at the floor. What is the temperature of incomming air?

4x4, 590CFM in 440CFM out the window. Back to running bare bulb ar 1050 watts, room needs to be a 60° for fans,to cycle off. Fan on at 73° off at 71°, peaks at 76 or so. I can get tent to 8° over incoming air temperature for low, 16° for high. That's at 1050 watts, at 800 watts it runs much cooler. 400 watts won't turn fan on, 600 watts if room is close to 70°.

Cheers



Sent from my SPH-L720T using 420

 

[millertm]

I've had mine up to 96 in summer time, as long as air is moving won't hurt ( some strains like it hot), don't listen to people that say it has to be 70 or 75. If that was the case you couldn't grow outdoors

While your train of thought is correct that is not the case. 80 plus in an indoor tent is to hot (LED lighting will be ok to 85°.) Outdoors plants are in a different ecosystem and can transpire correctly. Indoors, you are under different operating conditions and your plants are best suited to grow in mid 70's.

Cheers

Sent from my SPH-L720T using 420

 

[millertm]

Quick shot of few setups.

1050 watt Eye

400 watt MH, very cool running.

Few other bulbs. 750 watt running at 800 watts

Dial a watt ballast are king.

Cheers

Sent from my SPH-L720T using 420

 

[Buckshot317]

Those ballast are handy, that's what I run, 600 with air cooled hood, 3 degrees warmer, I use 6inch raptor reflector, very efficient