New light brought new heat!!

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xrdamianxr

Well-Known Member
2x4 closet grow. 4" infinity exhaust with filter. Passive intake. Multiple fans moving air. Had 150w mars and 100w Spider. Temps were 81F at highest
New light. 400w updaday. Dimmed to 50% and my temps are at 86 already...
Do I add a intake fan to push New air in?
Upgrade my exhaust to 6"?
Both?
Lol. Thanks for any input. Hope I gave enough info
 
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xrdamianxr

Well-Known Member
Also. Lights on at night... New temps reached a high of 90F!! some time during the night. They just turned on and I was able to check
 
Captain Fap

Captain Fap

Well-Known Member
You can set up some fans mounted above or at the same level of the light that will blow constantly and solely on the light unit then mount your exhaust fan inlet as close to the flow of air coming off the light to evacuate it as quickly as possible. Example, have two pole mounted high flow fans on the left of the tent/room at level with the light, on the right side you would have your carbon filter or exhaust duct mounted leveled with the light.
 
Captain Fap

Captain Fap

Well-Known Member
But to keep it real with you homie.. I was eyeing that light due to the sale, been on the verge of replacing my 1000w hps with modern equipment.. it was too small for a 5x5 but I wouldn’t try running that in a 3x3 unless I had above average airflow or a way to do cold air induction/intake. Big light + small space = lots of heat
 
Nizza

Nizza

Well-Known Member
First thing I'd do is make sure you have enough passive intake. For one 6 inch I'd try two eights or a 10 for intake passively

If the tent is getting hotter than the room it's vented into focus on improving venting of the tent
 
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xrdamianxr

Well-Known Member
Nizza said:
If the tent is getting hotter than the room it's vented into focus on improving venting of the tent
Click to expand...
.
Room is 70F. Closet im using in room 90F.
I am exhausting the closet to outdoors via hole in the wall out to soffit. And my passive intake is only 4" square. So that sounds like a problem now.
 
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xrdamianxr

Well-Known Member
Captain Fap said:
But to keep it real with you homie.. I was eyeing that light due to the sale, been on the verge of replacing my 1000w hps with modern equipment.. it was too small for a 5x5 but I wouldn’t try running that in a 3x3 unless I had above average airflow or a way to do cold air induction/intake. Big light + small space = lots of heat
Click to expand...
The price GOT me. Without even thinking about more heat. I'm a sucker
 
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xrdamianxr

Well-Known Member
I'll upgrade the exhaust to 6" (will take a week to get here)
Look at a larger filter
Arrange the fans I have to blow across the light and to the exhaust
Drop my soon to be old 4" down to the intake to push fresh in
 
LeastExpectedGrower

LeastExpectedGrower

Well-Known Member
xrdamianxr said:
I'll upgrade the exhaust to 6" (will take a week to get here)
Look at a larger filter
Arrange the fans I have to blow across the light and to the exhaust
Drop my soon to be old 4" down to the intake to push fresh in
Click to expand...
The 6" as an exhaust should match pretty well with the 4" as an intake. I use 2 6's but dampen down the intake by using a few layers of filter cloth to keep out any dust or other contaminants. Keep a lookout on the new AC-I controller. It allows you to adjust both fans independently of each other.
 
ttystikk

ttystikk

Well-Known Member
xrdamianxr said:
I'll upgrade the exhaust to 6" (will take a week to get here)
Look at a larger filter
Arrange the fans I have to blow across the light and to the exhaust
Drop my soon to be old 4" down to the intake to push fresh in
Click to expand...
I don't think this is a good idea. Anytime you push air you heat it. Blowing air into the space might add more heat than the other unit removes.

The real restriction is your carbon filter. Address that and you'll be fine.

One last item; warm temperatures are not your enemy under LED lights; mid to upper 80s is fine, because LED lights don't emit as much infrared and therefore don't warm up your plants as much.

You want your leaf surface temperature to be in the upper 70s. Where exactly is the thermostat in the tent? If it's sitting in full light it might be reading excessively warm.
 
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xrdamianxr

Well-Known Member
ttystikk said:
You want your leaf surface temperature to be in the upper 70s. Where exactly is the thermostat in the tent?
Click to expand...
Okay okay. The world is throwing me hints to get a thermo gun for l.s.t. haha I'll order it now
My thermostat was hanging directly under light right next to tallest plant cola...
 
bam0813

bam0813

Well-Known Member
Better look at humidifier that’s up to it too. Can’t imagine that won’t be effected by running big or bigger exhaust
 
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xrdamianxr

Well-Known Member
Markshomegrown said:
bigger exhaust does reduce humidity but reducing the room temps does increase the humidity.
Click to expand...
Ya. Temp vs rh struggle f-ing sucks! Lol. For some reason I battled bud rot last year so I've been keeping it low 30-40% but 90F brought that down to 25% yikes.
Lights turn on in 20 minutes. Will see what my changes last night made any difference
(Arranged fans differently
Still had 1 higher setting left on exhaust
Inflated intake hole)
 
M

Markshomegrown

Well-Known Member
xrdamianxr said:
Ya. Temp vs rh struggle f-ing sucks! Lol. For some reason I battled bud rot last year so I've been keeping it low 30-40% but 90F brought that down to 25% yikes.
Lights turn on in 20 minutes. Will see what my changes last night made any difference
(Arranged fans differently
Still had 1 higher setting left on exhaust
Inflated intake hole)
Click to expand...
what's the night temps/humidity? (lights off) bud rot will only hit your plants when the lights are off (lower temps, higher humidity)
 
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