3k or 4k CMH, 4 Plants Different stages

Nellyitis

Nellyitis

Member
Hi guys,
So I Have a grow running at the moment with 2 plants that are 3 weeks old and the other 2 plants are 1 week into flowering, Should I use a 3k or 4k bulb? Running CMH. suggestions would be great!

cheers!
 
Nellyitis

Nellyitis

Member
Cool, Maybe I'll keep the 4k running for 2-3 more weeks or so then swap over..

thanks guys!

is it ideal to keep the 4k running till the flowering initial growth settles?
 
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XDRollingStone

Member
I'm getting a 315w cmh myself is there a big difference with 3100k vs 4000k. I don't really wanna spend 50-100 dollar on another bulb. The package I bought is the 315w CMH Vivosun that come with 3100k bulb
 
Nellyitis

Nellyitis

Member
XDRollingStone said:
I'm getting a 315w cmh myself is there a big difference with 3100k vs 4000k. I don't really wanna spend 50-100 dollar on another bulb. The package I bought is the 315w CMH Vivosun that come with 3100k bulb
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Quite the difference. Less Stretch, more Ideal Spectrum for vegetation.. Ideal but dont stress. if you dont want to fork out the cash youll be sweet still.
 
Lucky Luke

Lucky Luke

Well-Known Member
you will like the CMH I recon. Brings out some nice oil and denser buds that the equivalent wattage of HPS.
 
diggs99

diggs99

Well-Known Member
XDRollingStone said:
I'll be using it in a 3x2x6 tent you think it be too hot to run it in that tent
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I think you will at the very least need an exhaust fan to help release some of the heat

I went the entire run in that tent and under the CMH without exhaust, temps got as high as 82-83. Thats in a 4x4x7, i expect 2x3x6 will get a little warmer
 
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Apalchen

Well-Known Member
Def need exhaust I ran my cmh in 3x3x6 and def need to vent air. I've run both and flowered and vegged under both. They are both really nice lights for either stage, I can say I think the 3100 helps finish a bit earlier.
 
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Hempire828

Well-Known Member
I’m using a 41k... one thing I can say is mine seem to love it as well... I don’t believe you u could go wrong.... do you guys recon one runs cooler aa far as temp... that’s the only reason I see a need to JUST change...my tree looks like it has glitter oit at 5 weeks... I’m impressed... now the summer heat with the 315 is another issue... a fan and vent fan as well as a/c..I don’t see me JUST changing more less adjusting to it... jm2c
 
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