Adding 600w hps to 315cmh - Vertically

J

JDMase

Well-Known Member
Hey guys, I'm growing in a 1 metre by 1 metre 2metre tall tent.

Got 1 315w cmh hung vertically with some trellised girls 4 weeks into flowering. Hot weather has caused some cooling issues already, hitting temps of around 35c.

Would adding a 600w HPS be worth it? Could I switch it on for a short period to mitigate heat issues? If so, when should I get it to come on? I was thinking the theoretical "midday".

Thanks.
 
coreywebster

coreywebster

Well-Known Member
JDMase said:
Hey guys, I'm growing in a 1 metre by 1 metre 2metre tall tent.

Got 1 315w cmh hung vertically with some trellised girls 4 weeks into flowering. Hot weather has caused some cooling issues already, hitting temps of around 35c.

Would adding a 600w HPS be worth it? Could I switch it on for a short period to mitigate heat issues? If so, when should I get it to come on? I was thinking the theoretical "midday".

Thanks.
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First off, where the hell have you been. I thought you had vanished?

Secondly, im not following your logic.

You have heat problems, its too hot with just a 315 but you want to add more wattage? If your hitting 35c with a 315 then your going to be going through the roof with an extra 600w hps.

You say midday but surely your running lights on at night and lights off in the day?
 
gr865

gr865

Well-Known Member
I believe the 600W would be hotter than the 315W, my 400W was hotter.
How many plants, exhaust cap. Where do you have your ballast?

Am running a 4' X 4' with two 315's horizontal, but have run them vertical also and I can control my temps to 80 degree lights on, and keep the tent around 68 to 70 degrees at light off. My outdoor temps are mid 90's F daytime highs.
Run a 6 inch MaxFan, forget the CFM but it draws thru a 6 x 24" Phresh Filter.

Oh and I agree with CW, where the hell have you been? Good to see you back around my friend.

GR
 
J

JDMase

Well-Known Member
pinner420 said:
Sounds like a bigger fan might be the first step...
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I was thinking that - or an evaporative cooler. I mistyped anyways it's more like 25c lights on with the 315. Especially now the heatwave has passed, shouldn't be getting much hotter.

coreywebster said:
First off, where the hell have you been. I thought you had vanished?

Secondly, im not following your logic.

You have heat problems, its too hot with just a 315 but you want to add more wattage? If your hitting 35c with a 315 then your going to be going through the roof with an extra 600w hps.

You say midday but surely your running lights on at night and lights off in the day?
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Had a security risk and just stopped for ages. Put me back months and out of pocket from all the black market dealers ripping me off.

Yeah I meant 25c I don't think it's ever higher than that, humidity around 40-50%

I more meant will I need something when I put the 600w in there. I am not sure how much heat it would add.

I meant their midday, I run my lights at night :)

gr865 said:
I believe the 600W would be hotter than the 315W, my 400W was hotter.
How many plants, exhaust cap. Where do you have your ballast?

Am running a 4' X 4' with two 315's horizontal, but have run them vertical also and I can control my temps to 80 degree lights on, and keep the tent around 68 to 70 degrees at light off. My outdoor temps are mid 90's F daytime highs.
Run a 6 inch MaxFan, forget the CFM but it draws thru a 6 x 24" Phresh Filter.

Oh and I agree with CW, where the hell have you been? Good to see you back around my friend.

GR
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Ballasts are outside the tent, I have a 6" rhino extractor that's thermostatic.

3 plants all tied back against the tent walls, the fan exausts right out into the room which has a huge window open a fraction at all times. Hitting temps no more than 27c right now.

I was perfecting my craft ;) I stopped for a while, practiced the basics and dealing with stressed plants. Lost a few rebuilt and I'm 4 weeks away from harvesting now. Started some mycelium based projects too thanks man
 
gr865

gr865

Well-Known Member
JDMase said:
I was thinking that - or an evaporative cooler. I mistyped anyways it's more like 25c lights on with the 315. Especially now the heatwave has passed, shouldn't be getting much hotter. Ballasts are outside the tent, I have a 6" rhino extractor that's thermostatic.

3 plants all tied back against the tent walls, the fan exausts right out into the room which has a huge window open a fraction at all times. Hitting temps no more than 27c right now.

I was perfecting my craft ;) I stopped for a while, practiced the basics and dealing with stressed plants. Lost a few rebuilt and I'm 4 weeks away from harvesting now. Started some mycelium based projects too thanks man
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Those temps should be fine, lights on temps sound good to me, your lights off temps have to be in the mid to upper 60's.
Last night I lowered the temp in the room where I extract the air for the tent, it was 80/82, now it's 78/79. I like having around a 10 to 12 degrees F difference between night and day during this stage of flower. I do not want the lights off temps to go below 68 as I worry the lower temp will hamper growth.

I think if you add the 600W remote ballast and increase the size of you fan blowing the air directly across the lamps you should be fine.

GR
 
J

JDMase

Well-Known Member
Well I did it anyway I'm going for 3 hours of 600w additional to 315w cmh, see how high the temps get tonight and go from there. Gonna have to stick with the 5" rvk for now. Fingers crossed lol.

image.jpg

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This was a few days ago for reference.
 
J

JDMase

Well-Known Member
coreywebster said:
Did you change anything medium wise? Last I remember you were hand watering rockwool slabs and having issues.
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Nah I got over the issues. Started using hydroguard but customs started banning that so now I'm onto great white microbes and I get no issues now. Only thing left to sort is lowering temps when the weathers warm.
 
J

JDMase

Well-Known Member
LowOriginz said:
did you end up increasing the HPS light time and for how much? how was the temps looking?
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I think I'm gonna keep it at 3 hours for now, maybe up it to 6 next week. Temps are max at 35-37 and at lights off around 25 (both Celsius).

I don't want the added heat to cause my buds to foxtail or become less dense.

I'll probably chop within the next 2 weeks
 
J

JDMase

Well-Known Member
gr865 said:
Those max temps are a bit high JD, is that just for the 3 hours period?
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Yeah just whilst all the lights are on. I'd like the lights on more if I could get the temps down. I think the additional light outweighed the negative effects from heat. I've had some great growth since adding the hps.

I'll have to invest in an a/c soon..
 
J

JDMase

Well-Known Member
OneHitDone said:
Ditto

bump up to like a 10" fan and save the a/c bill if possible
I run a 14" Fan on a 5x9. Led peeps think I'm kookie for it but I'll take my 253W Max Fan over an A/C any day :hump:
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Great point but what about the noise? I accidentally bought a 10" rvk when I first started and it sounded like a jet engine in my tiny space. My tent is in my living room lol.
 
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