Beleaf
Well-Known Member
Wow Shiggity!!! Just wow.
Anyone growing or familiar with CMH?
- Thread starter schomegrown
- Start date
Thanks Beleaf, I just love this life! I will be doing a build thread on my LED lights. Can't include prices but I can show the parts list and show how easy they are to make. The frame is the hardest part!
bignugz420
Well-Known Member
I can't get you a DE CMH but can get you a air cooled sunsystem , 3k bulb , ballest built into it for 575.00 now there are even conversion units you can buy, and turn any hid reflector into a CMH, google cmh conversion kit and you'll see how cheap it is
bignugz420
Well-Known Member
Justwannagrow
Well-Known Member
I thought that your not supposed to air cool CMH?
bignugz420
Well-Known Member
You can you only lose 3% of UV and IR thru glass to have it air cooled I'll take the loss, but idk sunsystem made that light that came as a CMH, so I would assume they are ok I love it it's my favorite light
Justwannagrow
Well-Known Member
So how is the heat? Hard to control?
bignugz420
Well-Known Member
They really aren't that hot esp compared to any HID out today, but the air cooled version def helped out a lot thru hot days off summer and it came with 8" OVAL ports that's kinda annoying the oval and the air blows right above the bulb as the bulb shouldn't get air blasted right on it so i def recommend a cmh you can easily turn any reflector into one with a conversion kit
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- #69
schomegrown
New Member
I would highly recommend the air cooled CMH. I have mine under control now, but wasn't an easy task. I would have been better off getting a cooled unit than the one I have. No doubt I love my light but they do get very warm. Now this is during the summer, I'm sure ill be fine in the winter with out as much cooling. During setup I cut it on with no fans on in my room. My temp gauge was at 110F in the room. Have since gotten a portable A/C and have 3 fans cycling fresh cool air.
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- #70
schomegrown
New Member
Sorry everyone... I know I kinda disappeared for a while. Had so much going on but now that I'm caught up I wanted to update on my CMH. I am a few weeks away from harvest with my Lemon Garlic OG, Original Bubblegum, and Grizzly Purple Kush. I didnt do to many techniques with these girls as I was trying to learn to control the environment under this light before I got all fancy. I did top them. My thoughts on the DE 630w CMH are that I absolutely love it. The node stacking is amazing. You could definitely see the difference the light makes with your plants after a day. In flower I'm getting nice dense bud growth and amazing penetration. I have lots of lower buds that are fatties. If you are thinking of getting a CMH I recommend getting a cooled unit. As this was my first HID light I had not prepared myself in the beginning for the heat that thing puts out. I now have my room and grow environment under control. I am ready to have fun on this next grow with some autos. Will be doing a journal on them so please look out for it to start after this harvest! Thanks everyone for stopping by!! I will be happy to answer any questions so just ask. Here are a few pics...
Lemon Garlic OG
Grizzly Purple Kush
Original Bubblegum
Lemon Garlic OG
Grizzly Purple Kush
Original Bubblegum
Seaweed Farmz
New Member
Do you happen to have pics of said WWAF? Also CMH is the new shit for HIDs for sure. Compares with LED on the spectrum and has the penetration of a HPS.
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- #72
schomegrown
New Member
I can't find his pictures of the white widow but I did find one of his Toofless Alien Auto. This thing was a beast but I still think the WW blew it away. I'm gonna keep looking see if I can find it.
An I love my CMH just took me time to learn how to control its environment.
Curbcalamity
Well-Known Member
630s arent great, the horizontal reflectors are like, not super in my opinion. I run (6 if you include the pre veg tent) so 5 of them in a 8x8 spave. they're by far the best HID lights there is but I think the beauty is how close you can hang the vertical fixtures.
phillips invented the technology. that's why they still produce the best bulbs. some people will argue maxpar are better but the Phillips the way I understand have te most UV. the ballasts themselves IMO the best ballasts are made by nanolux. but then I'm a fan of the 315W., I feel the 630W runs way hotter than a 600W hps and while you get a better spectrum the heat management gets a bit insane, friends of mine are running 7-8kw/h A/C just to maintain a working temp.
is how I Have them, have 4 LED bars in a cross around 5 315s in a dice config. but keep in mind I have less than 2m clearance from floor to ceiling so 630s wouldn't be feasible for me, plenty of friends back home use them using one 3100 and one 4200 bulb and yes, the extra 315W will give better results, if you can manage the heat but not as great as an improvement as the 315Ws and only really a good idea if you have a larger grow area, like, my friends use them in 20'x12' rooms,
as far as height, horizontal reflectors always have to be hung quite a bit higher as the mirroring effect intensifies the light (sort of the point but they don't last long cos of the heat) id start at maybe 24 and work my way closer, I keep mine at about 12-18
Curbcalamity
Well-Known Member
my friends have this to say and they were commercial retailers for massive stores in my country.
nanolux make hands down the best ballasts. wireless controllable so no large load switch, random start so they don't all turn on at once (within 10s of each other) soft-start until all of them are light and warmed up, dimmable from 50-110% the controller monitors ballast current and temp at all times and they fully sealed commercial ballasts, the low freq square wave also means no RFI plus extended bulb life. bulb life compared to HPS. and a CRI of 92. compared to a HPS which has 65 and a MH has about 42 i believe. (closeness to sunlight)but don't believe anyone who says a 315W has the penetration of a HPS that's (imo) a load of crap. (
phillips make the best globes. - but just. they invented them. so what ya expect.
they also reckon you get the same quality improvement and higher yields if you switch from HPS to CMH in the last 2 weeks only but I haven't tested it.
reflectors, I like the nanolux because they don't get hot they barely need to be replaced. just make sure you buy open hoods for CMH or you lose the benefit of the UV light
errr, radition> yes of UV rays quite can damage the eyes, lead to skin cancer and also genetic mutations. but the radioactivity is something I've never heard of. they run hot, like, ALMOST as hot as a 600W HPS. but I also believe CMH + LED grows the best cannabis LED + Co2 grows the cheapest cannabis
Thanks for the info. CMH is something I’ve been thinking about since it first came out but haven’t done much about yet.
When it first appeared there were a lot of radiation warnings about the UV. From what I read later that was solved by making a double jacketed bulb. I think well before I got around to making that post, but there seemed to be a bit of a lag on getting reliable info about CMH for some reason. Still is.
When it first appeared there were a lot of radiation warnings about the UV. From what I read later that was solved by making a double jacketed bulb. I think well before I got around to making that post, but there seemed to be a bit of a lag on getting reliable info about CMH for some reason. Still is.
I run a CMH315 in a 3x3 cabinet...needed some heat and great reviews on fat sticky buds. The 4k is the full spectrum bulb. I veg through stretch with the 4k, then swap in the 3k redder bulb to finish fattening up the flowers. I grow organic soil...just finished up my 4th grow...a flower shot from each. I highly recommend this light.
Weaselcracker...I run Philips 4200 for veg through stretch...full spectrum...the swap in the Philips 3100 to finish flowering, visibly redder spectrum.
Dr Fish
Well-Known Member
My mixed hydro thread uses 3 different type lights, one plant, one light, in scrog screens.. The cmh done with the 3100 bulb that came with the SS 315. I feel 3 -315watt cmh lights should be able to do 1.5 gpw in 100days.from seed..
Curbcalamity
Well-Known Member
the double jacketed bulbs allowed for open fixture rated globes to be made. they run so hot the difference in outside and inside temps meant they needed sealed hoods, so double jacketing stops the bulbs cracking from temp stress and cuts down on the UV, but honestly, we should all be wearing sunglasses in a room with HID lighting and reflective surfaces. i don't though, so not judging here. oh also there's a huge difference with horizontal and vertical bulb orientation and how it affects penetration and spread, the horizontal gives better penetration and intensity but less even footprint and half the light is pointed the wrong way meaning the reflectors get hot, vertical bulbs you can hang super close to your plants. like, I think I might have 12-18 inches and if you germinate seeds under CMH they have no issues, I found taking them from a pre veg with a 400W MH the CMH in the flower room stressed them out for a couple days. they sort of just did nothing. but when I put a cmh in my pre veg tent not the same issue and they don't stretch like a MH that's hung a little to high - but for 315W they run so hot
I also don't get the 4K bulb if you look at the spectrum chart you see the scaling is half that of the 3100K bulb meaning its actually putting out way less light energy than the 3K, I run 4x3K and a 4K in the middle just for some difference.***EDIT***
so just something else to remember is that UV light is the main cause of genetic mutations in living organisms, this means the CMH lightsd will make your plants genetics shift faster than with other light sources, in theory.
