Calling all 4x8 tent growers, need advise

browntrout

Well-known member

Veteran

• Nov 27, 2018

• #1

Looking for some help, just bought a cheap 4x8 tent and a cheap dimmable Vivosun 1000W MH/HPS light. A bit new to small scale ten grows.

It's more for testing different hybrids and breeding. Not going for massive yields just healthy 2-3' plants in quantity

How many plants do you guys run effectively under 1000W in soil?

Pictures of your setups would help.

 

ThaMagnificent

Member

• Nov 27, 2018

• #2

you're gonna need more lighting. At least another 1000w

 

Koondense

Well-known member

Veteran

• Nov 27, 2018

• #3

Or 3x600W.
Or 6x 315W cmh

 

Dog Star

Active member

Veteran

• Nov 27, 2018

• #4

1000 is good for 5x5 space..

 

zachrockbadenof

Well-known member

Veteran

• Nov 27, 2018

• #5

Koondense said:

Or 3x600W.
Or 6x 315W cmh

Click to expand...

koon - this is what i don't understand - i was told (maybe wrongly) that a 315w cmh is outputting close to a 600w mh/hps - if thats the case, '3' 315's should be enough to equal '3' 600watters...

i'm only on my 2nd cmh grow with '2' 315's in a 4x3.5' tent , n i don't think its enough lite n i'm going to add a led light on both sides...

 

Koondense

Well-known member

Veteran

• Nov 27, 2018

• #6

Zach
I think the 315cmh and 600hps are in a different league, no matter what people say.
A fixture with 630cmh and a 1000hps are way closer in output and I think they can have a similar par light output except the cmh has a broader(better) spectrum and likely make better buds and resin.
So yes, you're probably right to add more light since the 315cmh fits best a 3x3 space(actually 80x80cm is perfect), the sides probably don't have enough intensity.
315 cmh is a bit better than a 400hps, not 600hps as many people say.

Ok, maybe for the OP's case with a 4x8 tent, two 630W CMH fixtures would be the best option. I'd go with this setup(or leds of course).

Cheers

 

browntrout

Well-known member

Veteran

• Nov 27, 2018

• #7

Maybe I'll get a couple smaller full spectrum LEDs for the sides. CMH was my first option until I realized the current retail rate.

 

ThaMagnificent

Member

• Dec 4, 2018

• #8

zachrockbadenof said:

koon - this is what i don't understand - i was told (maybe wrongly) that a 315w cmh is outputting close to a 600w mh/hps - if thats the case, '3' 315's should be enough to equal '3' 600watters...

i'm only on my 2nd cmh grow with '2' 315's in a 4x3.5' tent , n i don't think its enough lite n i'm going to add a led light on both sides...

Click to expand...

lol what? How does that even pass common sense?


315 W = 600 w????

 

Putembk

One Toke Over The Line

Premium user

• Dec 4, 2018

• #9

I have a 4x8 and run two 600w cool tubes. I think two 1000w will be to much heat and frankly over kill for the size. Been running this set up for 10 years now. I can get from 6 to 8 plants in flower depending on the strain.

 

zachrockbadenof

Well-known member

Veteran

• Dec 4, 2018

• #10

ThaMagnificent said:

lol what? How does that even pass common sense?


315 W = 600 w????

Click to expand...

guess i'm just fukin stupid

 

Defacto

Member

• Dec 4, 2018

• #11

Putembk said:

I have a 4x8 and run two 600w cool tubes. I think two 1000w will be to much heat

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I verify that Putmbk does have the awesome grow that he claims!


fwiw, I struggle to keep it under 80 F degrees with 2 1000 watt bulbs in a 9' x 12' room.

 

browntrout

Well-known member

Veteran

• Dec 5, 2018

• #12

Defacto said:

I verify that Putmbk does have the awesome grow that he claims!


fwiw, I struggle to keep it under 80 F degrees with 2 1000 watt bulbs in a 9' x 12' room.

Click to expand...

I've got another 3 months of -C temps in separate building. (I live in the frozen wasteland of hoth FYI) I can keep building temps at 8C if I wanted, I am actually thinking with the air cooled ballast 6" fan setup etc. that I may loose to much heat and will need to regulate fan speed on intake / exhaust. that way the heaters external to tent can be turned down/off.

 

Putembk

One Toke Over The Line

Premium user

• Dec 6, 2018

• #13

browntrout said:

I've got another 3 months of -C temps in separate building. (I live in the frozen wasteland of hoth FYI) I can keep building temps at 8C if I wanted, I am actually thinking with the air cooled ballast 6" fan setup etc. that I may loose to much heat and will need to regulate fan speed on intake / exhaust. that way the heaters external to tent can be turned down/off.

Click to expand...

I use timers and router (speed) controls on all fans...works great. I also recirculate the light fan and vent it back into the room in the middle of winter to help get the heat up. I run flower at 74f and keep the humidity between 50 and 60% using this method.