• Here is a link to the full explanation: https://rollitup.org/t/welcome-back-did-you-try-turning-it-off-and-on-again.1104810/

Northern Lights 315w CMH

citeh

citeh

Well-Known Member
Just started my first grow under a CMH. I've had two successful grows under a little 150w HPS and decided it was time to go bigger.

I'm growing one feminized Northern Lights plant from seed in 100% coco (dtw). My goal is to pull at least 10oz's from this grow, we'll see...feel free to ask questions or offer advice.

4x3 Tent
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Max tent temperature 77F with romote ballast outside of tent.
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3 days above ground.
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Evil-Mobo

Evil-Mobo

Well-Known Member
I'm in brother good luck. I am currently flowering my first grow which is NL as well in my 3x3 under a CMH too and she's loving the light but hasn't been under it her entire flower period so I am curious to see what your's will do from beginning to end under it. What Kelvin rating on your Bulb?
 
citeh

citeh

Well-Known Member
I couldn't find much info on how close to put the light to seedlings, I've got it about 36" above the seedling with no stretching or visible light stress.
 
Evil-Mobo

Evil-Mobo

Well-Known Member
citeh said:
I couldn't find much info on how close to put the light to seedlings, I've got it about 36" above the seedling with no stretching or visible light stress.
Click to expand...
I have mine in a flower tent so can't help there. I would say if you want to see where you can push it to just try very small increments and check after an hour or so
 
citeh

citeh

Well-Known Member
Day 5 above ground. Second set of true leaves have appeared. Stem still has a slight curve to it, thought it would straighten out by now.

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SoOLED

SoOLED

Well-Known Member
the phantom is a good looking and well made unit. I wish it had the reflector from the suntec though.

the ballast gets hot, I had to get a little desk fan on it.

but external ballast is a better design IMHO, you can change it out or use a after market one.

I cant think why when LEC/CMH they wanted the ballast in the unit. I cant think of a single reason. other then cost.

 
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citeh

citeh

Well-Known Member
Agreed, I wanted a remote ballast and it just happens to be about $100.00 less than the sun systems. My tent peaked at 81F when it was 92F outside. I'm also not running an exhaust fan, so I've been pleased with the heat output.
 
SoOLED

SoOLED

Well-Known Member
citeh said:
Agreed, I wanted a remote ballast and it just happens to be about $100.00 less than the sun systems. My tent peaked at 81F when it was 92F outside. I'm also not running an exhaust fan, so I've been pleased with the heat output.
Click to expand...
they do make a cooling (adp) though I never seen one hooked up
http://hydrobuilder.com/phantom-cooling-kit-for-phr3150-cmh-reflector.html?dzid=csegps_PHR3150CKT&gclid=CjwKEAjwqdi7BRCL6Zmjk5-rsTwSJABmrVabWG19iJLErf7mPaGshWexcv4vA00qzr3RtrcvlN5mSBoCJLrw_wcB
 
citeh

citeh

Well-Known Member
Day 14, had a minor pH problem (probe was measuring 1.01 too low!). Recalibrated and flushed with 2.5tsp of floranova bloom and calimagic /5g. Perked right up after a few hours. Also the roots are showing through the bottom holes already in a 3.2g pot!image.jpeg image.jpeg image.jpeg image.jpeg
 
citeh

citeh

Well-Known Member
Day 21, topped her a second time today. Looks angry, but I'm sure she will rebound by tomorrow.

It's been difficult topping and training with the CMH lamp because the node spacing is so tight. image.jpegimage.jpeg
 
SoOLED

SoOLED

Well-Known Member
a little canna BSDM: when you run a few times, start keep track of days it takes to recover, IME: there is a sweet spot, on time you can spend training before you are just running in to time you could be on another cycle.

or get a test tent: mine is where old moms go, or I test unknown clones and try all sorts of silly things.
 
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