All BS set aside CMH yields

is it true or not

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kickinmule

Active Member
Merlin34 said:
Well, my big grow is just getting filled up so I don't have yield info from mine. But we have a smaller grow and have been doing side by sides, HPS 1000s vs the 315s. The 1000s have been yielding more on the same square footage of floor space, but it's real close. The grower there (who I don't think is using the 315s right... His are way to close) is pulling more than an elbow a 315. Looking at my plants now that are 4 weeks in I'm positive I'm going to crush his numbers. The one thing the side by side has deffinatly told us is that we see a 20-30% increase in THC with the 315s when running the same strains under both sets, HPS and 315s.

Colorado
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Hi there I am replying with regard to this older post as I am only now considering the switch to CMH. Where have I been? Do you feel still feel that the switch to cmh is a good idea? I was planning on using a Philips Master 3100 bulb. Thanks
 
Chip Green

Chip Green

Well-Known Member
A single 315cmh will cover nearly 9 square feet adequately, hanging at say 20"...
The horizontal hoods, will throw a rectangular footprint, vs the vertical being more square-ish.
Don't count on it replacing much higher wattage output HID systems.
I own several 315W units, they produce fantastic results, when used within their capability.
 
M

mr. childs

Well-Known Member
Chip Green said:
A single 315cmh will cover nearly 9 square feet adequately, hanging at say 20"...
The horizontal hoods, will throw a rectangular footprint, vs the vertical being more square-ish.
Don't count on it replacing much higher wattage output HID systems.
I own several 315W units, they produce fantastic results, when used within their capability.
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a 630 cmh could cover 16sq ft if hung high enough ?
 
K

kickinmule

Active Member
Chip Green said:
A single 315cmh will cover nearly 9 square feet adequately, hanging at say 20"...
The horizontal hoods, will throw a rectangular footprint, vs the vertical being more square-ish.
Don't count on it replacing much higher wattage output HID systems.
I own several 315W units, they produce fantastic results, when used within their capability.
Click to expand...
Thanks very much for your your reply. Yeah, i’m not naive enough to believe in miracles so when I hear claims of a pound per 315 watt unit I am skeptical. I am thinking three plants under 1 square unit with the light 20 inches above the top. Would an expectation of 3-3 1/2 oz per plant be realistic using a 3100k bulb throughout. Thanks again
 
TintEastwood

TintEastwood

Well-Known Member
CMH can be fun and rewarding.
I did a couple runs in this thread.

Seven Sisters

How do you like those [air] manifolds for use with irrigation. I found several in a tote the other day, hah. Do you have to do much evening out of the flow, or are they pretty much all fully open and more or less even? Thanks.
www.rollitup.org
 
G

Grassizgreener

Well-Known Member
No worries my man, bags don’t lie at the end of my harvests.. just sharing info, all I did was size down a commercial grow into a workable space and replicate their methods, plants do the rest.
I would show the chop day photo but it’s a ugly site, just a flopping mess;)
 
Dividedsky

Dividedsky

Well-Known Member
I've added 630 cmhs to my flower room full of 1000s hps. Really liking the dual bulb 630 cmh and the results I've gotten. I like mixing the spectrum and running 3100k and 4200k philips bulb in ea 630 hood. Want run a few 630s by themselves to see what they can do by themselves but definitely like less heat and less power consumption. Especially seeing as I run a 2 ton mini split in my flower room.
I'm thinking about switching the all the 1000s over to 630s, would be able to run about 8-630s or split it up into 16- 315s, though I would probably just go with the 8-dual bulb single 630s...Either way cmh works very when mixed with hps for me at the moment.
 
Boatguy

Boatguy

Well-Known Member
Grassizgreener said:
If u let ur babies stretch, u would hit 120g a square brotha, my plants finish 3 to 4 times the size what u ended with.

I’ll update this thread end of the month when it’s about 8 weeks in that test room
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I may have tucked too long or flipped too early. I grow from seed so its a crapshoot.
The tops were all around 12" tall. Maybe next go ill get lucky and they will follow my plan
 
bodhipop

bodhipop

Well-Known Member
Boatguy said:
Most jammed grow i have had, i wound up with a measly 40g per square foot dry. I can not imagine what 120g per square would even look like.
View attachment 4560331
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Are you running two 315's in that tent or more?
I'm wondering everyones average time for bulb life.
I've ran around 5 flower cycles with my 315 Phillips bulb and I'm thinking it's time to swap.
 
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