Dankman_420
Well-Known Member
I remember reading years ago about CMH were originally made for additional lighting for greenhouses, which needed the extra heat. I have a friend who used to use one. He said it performed same as 600 hps
Weasel Forges Ahead
- Thread starter Weaselcracker
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Dankman_420
Well-Known Member
Nice buddage weasel!
Skybound
Well-Known Member
Is CMH dual spectrum? In my HID dayz, I remember that I couldn't find dual spec bulbs in 600 watts, they only had that for the KW bulbs.
Weas, have you considered a rocket stove? It's all DIY which turns some folk off, but being so far away from mankind I have to believe you like to get your hands dirty. I used to follow a guy just like you (Bigelow Brooke Farms) on YouTube and the guy built a kick ass geodesic dome somewhere up your way, but the whole dome was heated with a rocket stove, all the duct ran through the ground and he basically has a year round greenhouse that took VERY LITTLE wood to keep warm. If I had to live on them frozen tundras, that's the route I'd go.
Of all the journals I'm subbed to, never have I seen someone handle their buds as much as you. Me thinks you like sticky fingers, lol.
Weas, have you considered a rocket stove? It's all DIY which turns some folk off, but being so far away from mankind I have to believe you like to get your hands dirty. I used to follow a guy just like you (Bigelow Brooke Farms) on YouTube and the guy built a kick ass geodesic dome somewhere up your way, but the whole dome was heated with a rocket stove, all the duct ran through the ground and he basically has a year round greenhouse that took VERY LITTLE wood to keep warm. If I had to live on them frozen tundras, that's the route I'd go.
Of all the journals I'm subbed to, never have I seen someone handle their buds as much as you. Me thinks you like sticky fingers, lol.
I’m going to run CMH this summer. I’ll let you know how it goes. My 600W LED kills it but is a bit too much for warmer months. It’s a more passive heat than HID but 600w is still 600w. I buy the “sticky” argument from cmh. I’m not sure it will build flowers like HPs. We’ll soon see!!
CMH has a wonderful spectrum, but its efficiency is crap. 
So the end result is more power, more heat, fewer photons.
Without going into the math behind it (higher is better) ...
CMH rates 1.77
600 W HPS rates 1.59
1000W HPS DE rates 1.82
COBs and Samsungs rate 2.55 and 2.72
That's a metric for useable PAR output per watt.
So the end result is more power, more heat, fewer photons.
Without going into the math behind it (higher is better) ...
CMH rates 1.77
600 W HPS rates 1.59
1000W HPS DE rates 1.82
COBs and Samsungs rate 2.55 and 2.72
That's a metric for useable PAR output per watt.
Thanks GT! I hate hijacking a thread.... sorry Wease. PAR is a sum of all useable light energy within the spectrum. Surely the area of the spectrum or wavelength distribution matters as much as the total PAR? I guess my question is... optimum spectrum plays a more significant role than total PAR? I guess I’ve never heard a big argument between quality vs quantity of light. Just because it’s “useable” does the plant want it?
I still have 2 Timber setups 4x50w each Cree that I’ve never used for a cycle. My young ones didn’t really care for them and i kept pulling them for my xml.
I still have 2 Timber setups 4x50w each Cree that I’ve never used for a cycle. My young ones didn’t really care for them and i kept pulling them for my xml.
- Thread starter
- #2,587
Thanks a lot guys.
Spitz if it wasn’t for people jacking this thread it would have gone silent the last two winters- so please do.
Most of the info I’ve read on CMH is very conflicting. Not sure why
I’m not worried about an efficiency loss if it’s producing some heat as a by product. If I was to convert to super efficient lights I would have to put an electric heater in the grow -which would obviously be stupid.
There was this fellow over by Dease lake (tiny northern BC town in the middle of nowhere) who was making these little twig burners and marketing them on the net when the net barely existed. My friend had one. We used to make coffee on it in the bush. A few little branches in there and it would really roar.
I feel like I handle my buds the bare minimum to trim them- but yer right I don’t see a lot of sticky fingers around the forum so maybe I’m doing it wrong.
Spitz if it wasn’t for people jacking this thread it would have gone silent the last two winters- so please do.
Most of the info I’ve read on CMH is very conflicting. Not sure why
I’m not worried about an efficiency loss if it’s producing some heat as a by product. If I was to convert to super efficient lights I would have to put an electric heater in the grow -which would obviously be stupid.Skybound I believe they call it a full spectrum light. I keep reading that a 315w CMH will compete with a 600w HPS. I also keep reading that a 600w HPS yields better. So- whatever that means....
Is that like a twig stove ? I’ll look it up.
There was this fellow over by Dease lake (tiny northern BC town in the middle of nowhere) who was making these little twig burners and marketing them on the net when the net barely existed. My friend had one. We used to make coffee on it in the bush. A few little branches in there and it would really roar.
I feel like I handle my buds the bare minimum to trim them- but yer right I don’t see a lot of sticky fingers around the forum so maybe I’m doing it wrong.
Skybound
Well-Known Member
As a former HPS and current LED user, I kind of agree with you, but to also add that I observe smaller plants (in my grow) aren't growing as quick under the LEDs as they were under the 4000k QB I have in veg. I added some supplemental CFL-type LED bulbs, but my small plants across all strains seem to generally be going slower ever since I stopped using a T5 fixture.
However my COB fixture (which is inferior to QBs and other COB brands) is straight up and down and all around wiping the floor with my 600w HID fixture. For my space and plant size, I only need to drive my COBs to about 65% of the total potential output and all branches pray daily till mid week 6. I regularly harvest 1 lb/plant from an estimated 350-400 wall watts of electricity. The driver is rated to consume 480 watts running full speed, but honestly, I'm only slightly above 50%.
Skybound
Well-Known Member
Thanks a lot guys.
Spitz if it wasn’t for people jacking this thread it would have gone silent the last two winters- so please do.
Most of the info I’ve read on CMH is very conflicting. Not sure why
Skybound I believe they call it a full spectrum light. I keep reading that a 315w CMH will compete with a 600w HPS. I also keep reading that a 600w HPS yields better. So- whatever that means....
Is that like a twig stove ? I’ll look it up.
There was this fellow over by Dease lake (tiny northern BC town in the middle of nowhere) who was making these little twig burners and marketing them on the net when the net barely existed. My friend had one. We used to make coffee on it in the bush. A few little branches in there and it would really roar.
I feel like I handle my buds the bare minimum to trim them- but yer right I don’t see a lot of sticky fingers around the forum so maybe I’m doing it wrong.
yeah, a twig burner. Some use small logs and with a hatchet, chop out twigs to forever increase the surface area and exposure of the fuel (wood) to heat, which speeds up pyrolysis and combustion. This then swirls in the stove which further burns the fuel, increases the heat, speeds the vortex and pushes the draft/exhaust through the ducting. The length of ducting is how you capture the heat by burying the ducts in cob, or plain dirt, but installed as a mud. Once it hardens, it's then a "thermal battery" and continues to dissipate heat for many hours after. So your twig fire can heat a large space for many hours after it goes out, and even in the most polar environment, you can maintain very comfortable temps with minimum fuel consumption. Maybe a half to a whole cord will get ya through a winter?
equal but other will harvest more but equal just one will give more weight but equal just not what harvested or used in power or cost.. Hang on, where are they equal? Sounds like led lighting. This 400w led panel (watts from wall) replaces 600w in a 3x3, especially if you use couple 100w panels for darkened corners...
I've wondered the same thing. If total PAR is equal, but one is heavy in greens and yellows, does that PAR matter to the plant?
I've always thought that the easiest way to raise PAR is to increase the power. Spectrum tinkering gets pretty silly.
But in the case of hps versus CMH, it probably is a significant difference. It's a very nice spectrum.
Heya friends. Thot i might chime in just cuz.
I had to look uo what cmh was but the article i did read had nothin but good things to say. Especially the spectrum. And seems like spectrum is what its all about these days.
And geez weez. Last thing you need to do is change anything
But new teck is fun indeed
Cheers friends
I had to look uo what cmh was but the article i did read had nothin but good things to say. Especially the spectrum. And seems like spectrum is what its all about these days.
And geez weez. Last thing you need to do is change anything
But new teck is fun indeed
Cheers friends
dynamo1
Well-Known Member
A best friend that grows, swears by them and he switched from HPS to CMH
Nivik reads an advertisement that says great things about the product being sold feralA9x and partimus have been using them for a few years now.. Both started with 315 in 4x4 and both added another, if that means anything... About 690w in 4x4 around $700 each for hi-par kit, ate cheaper kits but still seems an expensive way to get there..
feralA9x and partimus have been using them for a few years now.. Both started with 315 in 4x4 and both added another, if that means anything... About 690w in 4x4 around $700 each for hi-par kit, ate cheaper kits but still seems an expensive way to get there..- Thread starter
- #2,596
I’m starting to get the vague idea that they’re about what Graytail said- slightly more efficient than HPS but with a different spectrum. I’m too ignorant apparently to gain anything from staring at spectrum graphs- but some say the CMH spectrum is better for flowering, some (most) say it’s worse.
Given that I need some heat, maybe I’m best to stick with my original plan/pipedream and convert half of flowering to cobs or QBs and keep the other half HPS as it is now. Both are expensive but I’m guessing cobs are cheaper.
Given that I need some heat, maybe I’m best to stick with my original plan/pipedream and convert half of flowering to cobs or QBs and keep the other half HPS as it is now. Both are expensive but I’m guessing cobs are cheaper.
Meijiu led light alibaba.. Greytail is a spokesman and directs all people looking for lights to them (he doesn't really, he made point of not naming them, as they aren't sponsors). Mine actually arrived yesterday.. They are as Cheap as cheap stuff. Slightly more expensive than cheaper stuff...
Cmh flowering that I've watched, seems to stretch and fluff it out a tad but also produces beautiful frost covered goodness..
Cmh flowering that I've watched, seems to stretch and fluff it out a tad but also produces beautiful frost covered goodness..
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- #2,598
I did contact that company at one point asking questions. They replied with a bunch of info which to me sounded like gibberish and sent me back to LED wannabee school where I once again flunked out cause I decided my head hurt and I should just get stoned instead.
They put me on their list and were emailing me a bunch for a while. Once they heard I only wanted enough lights for a 4x4 area they realized I wasn’t worth talking to and vanished.
Thanks Griz. I’ll probably pm you at some point and see what you got.
They put me on their list and were emailing me a bunch for a while. Once they heard I only wanted enough lights for a 4x4 area they realized I wasn’t worth talking to and vanished.
Thanks Griz. I’ll probably pm you at some point and see what you got.
I get offers asking to test lights all time.. They think your a reseller if you ask a few questions when buying $400 worth of lights 19:
Mate I know jack shit about that tech.. I just watch what somebody like greytail produces, have no interest in dbhb, so must be lights.. I don't need to know about them except what they are.. I just ask for flowering spectrum..