What do you think about CMH lights?

Lucky Luke

Well-Known Member
Your right its not, just what happened , least in euro hydro shops. They were all touting them as equal to 600 hps at one point.
Doesn't help anyone to overstate somethings capabilities. Its not the bubs fault though. :D
Even in the HID VS LED debate comparisons should be W for W. Watts a constant.
Theres also advantages and disadvantages for all types of lighting depending on peoples environment.
 

Lucky Luke

Well-Known Member
630 cmh compared to a 600 hps not a bad comparison if u really want.
Agreed. Both are near perfect for a 4 x 4. 2 x 315s will cover the canopy better than a single 600. 600 will have slightly better penetration. 630wDE CMH will have better penetration than the 600w but less canopy coverage of the 3 x 315s.
w for w the cmh will deliver more light- tis a square wave ballast and is more efficient.
 

Gond00s

Well-Known Member
I haven't dabbled in LED flower lights. (they run to cool for me)
i got them nice and dialed in it took a while to get led temps where i want them to be.

CMH develops more frost for me over the HPS. Whats ur thoughts on that one over LED?
i did notice that the buds for me where a little bit more compact and just more small plants but i was getting really good frost with the cmh compared to led. led for me the buds are really nice and formed and just frosty as hell but nothing much on fan leaves or not much on the sugar leaves front. Cmh frost everywhere there was a bud site. hps i kinda did notice it but not as much, In-between led and cmh for frost. cmh short stubby frosty plants hps all around.led for efficiency and versatility i would get crazy dense buds throughout most of the plant but maybe was because i was running more power. all lighting has its owns pros and cons thats for sure.
 

Gond00s

Well-Known Member
yeah im full led rn summer time heat makes me go back to my 5x5 where its cool 5000 diodes hehe.
 

Bullygrowz

Well-Known Member
For those who have flowered under all three

I haven't dabbled in LED flower lights. (they run to cool for me)
CMH develops more frost and cannabinoids for me over the HPS. Whats ur thoughts on that one over LED?
I can agree to the cmh deceloping more frost and cannibinoids when i did a run with the 315w cmh in the middle of my hps lights i noticed big increase in quality
 

Agronut

Well-Known Member
630 cmh compared to a 600 hps not a bad comparison if u really want.
i supplement 630watts of CMH with 400watts of HPS in a 5x5 and kill it every cycle...I’ve tried every damn combo of lights you can imagine, but settled on 1 630wCMH fixture, horizontal( mixed spectrum bulbs, ushio 3800K + Hortilux 4100K) + in flower only I add an open bulb, vertical hanging 400w Hortilux enhanced spectrum HPS bulb. I swear and promise my buds are bigger and frostier and more potent than any of my bros growing under “just HPS” or “all COBS” or “LED all the way”.......plants given a mixed spectrum and heavy photon bombardment always reward!

The sun is the best, and is massively mixed spectrum, thats what your girls are looking for even indoors IMO the CMH provides that mixed spectrum, and the additional HPS for flowering provides the red spectrum photon bombardment for greater flowering potential.
 
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Kassiopeija

Well-Known Member
i supplement 630watts of CMH with 400watts of HPS in a 5x5 and kill it every cycle...I’ve tried every damn combo of lights you can imagine, but settled on 1 630wCMH fixture, horizontal( mixed spectrum bulbs, ushio 3800K + Hortilux 4100K) + in flower only I add an open bulb, vertical hanging 400w Hortilux enhanced spectrum HPS bulb. I swear and promise my buds are bigger and frostier and more potent than any of my bros growing under “just HPS” or “all COBS” or “LED all the way”.......plants given a mixed spectrum and heavy photon bombardment always reward!

The sun is the best, and is massively mixed spectrum, thats what your girls are looking for even indoors IMO the CMH provides that mixed spectrum, and the additional HPS for flowering provides the red spectrum photon bombardment for greater flowering potential.
Yes indeed this should be a very good spectrum I wonder how it looks like,,,, perhaps something like this in your veg-stage?

(In a forrest during the day)

and at the end of the day, the HPS would end with a high FR IR peak, when you terminate the system, developing like this, over several minutes:

(end of each day)

and you'll notice that the ordinate is incomplete... these lamps throw even more heatrays & UVB out than the pics are showing - and so is the sun, too.
 
Most CMH growers will say they prefer CMH
Most LED growers will say they prefer LED
Most HPS growers will say they prefer HPS.

Lot of misinformation still circulating about cmh, since they became popular it was stated a 315 would replace a 600w hps which is nonsense.

Go look for the 315 cmh club thread in indoor growing, then look at the 600 club. See what people are doing with both types of light.
Before I started my grow I spent a full 2-3 weeks crushing my brain with every detail about every light and there are so many things about each light and it gets so damn confusing.

What I did find that led me to my conclusion is that CMH is cheaper for electricity, bulbs last much longer, they are the only bulb from my understanding that offer a FULL SPECTRUM lots of red and lots of blue and can be used for both phases without any swap outs required, plus they make the plants look great to the eye.

You can see my plants active now on instagram @GoatbudsUSA
 

Agronut

Well-Known Member
Before I started my grow I spent a full 2-3 weeks crushing my brain with every detail about every light and there are so many things about each light and it gets so damn confusing.

What I did find that led me to my conclusion is that CMH is cheaper for electricity, bulbs last much longer, they are the only bulb from my understanding that offer a FULL SPECTRUM lots of red and lots of blue and can be used for both phases without any swap outs required, plus they make the plants look great to the eye.

You can see my plants active now on instagram @GoatbudsUSA
short version is this- HPS is big buds, ling nodes and less leaves...CMH is smaller buds, more leaves, stronger potency and better color/nose/frosting.....MH is compact, small rock hard nugs covered in frost but little weight and usually potent as hell.....LEDs can vary and produce good results but small yields, may look great and not be strong or vice versa....then you got cfl or T5 which work but IMO only for small veg or germinating plants.
 
short version is this- HPS is big buds, ling nodes and less leaves...CMH is smaller buds, more leaves, stronger potency and better color/nose/frosting.....MH is compact, small rock hard nugs covered in frost but little weight and usually potent as hell.....LEDs can vary and produce good results but small yields, may look great and not be strong or vice versa....then you got cfl or T5 which work but IMO only for small veg or germinating plants.
If this is the case I'm going to pour all types of light in the grow and switch it up.
 

Oakiey

Well-Known Member
I just don't know... The buld alone costs half as much as a complete 400 set up and doesn't cover anymore space.
 
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