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cmh 3100k vs 4200k

CMH with 3100/4200k

splitopenmelt
Member

I’ve settled on CMH lighting for my next indoor grow. I’m looking at some of the 630w/dual 315w units to light a 4×4 bloom tent and was wondering if there’s any merit to using both 3100k and 4200k lamps to get a more varied spectrum. Is there anything that should prevent me from doing so?

I apologize if this has been asked or is posted in the wrong forum, I combed several CMH threads on here and other forums and came up blank. TIA

Craigson
Well-Known Member
splitopenmelt
Member
OldMedUser
Well-Known Member

I’d use one of each for the whole grow. The more varied the spectrum the better as far as I’m concerned and most good light aim for that.

Found a real good article comparing different brands of those bulbs with all sorts of other tips and info you might want to look at to help you decide.

splitopenmelt
Member

I’d use one of each for the whole grow. The more varied the spectrum the better as far as I’m concerned and most good light aim for that.

Found a real good article comparing different brands of those bulbs with all sorts of other tips and info you might want to look at to help you decide.

OldMedUser
Well-Known Member

Philips used to make a 400W CMH bulb that ran off an HPS magnetic ballast. I have 3 of those ballasts but they don’t make the bulbs any more. There are others but not ones I can pick up anywhere and I have good HPS bulbs already.

If I were in the market for new lights I’d sure go with the new CMH ones. The older CMH had a nice full spectrum too and could do the grow from start to finish.

Like these Hortilux Daylight Blue MH bulbs. I was reading one of my older High Times mags and the guy in the article was saying they are the bomb for start to finish. Look at the spectrum these put out.

Compared to the crappy PlantMax MH I bought a while ago for $60. Couldn’t even find a pic of the spectrum online so had to take a pic of the one on the box. Not even a web address on the box so what does that say about them?

I've settled on CMH lighting for my next indoor grow. I'm looking at some of the 630w/dual 315w units to light a 4×4 bloom tent and was wondering if there's…

All BS set aside CMH yields

TheChemist77
Well-Known Member

as none of US have tested the bulbs,, my OPINION would be to use the 4200k for veg and the 3100k for flower.. i may be wrong but would you agree with that?

I’m going to be running a section of the 3100k bulbs in my warehouse. I’ll know the answer in a couple months. So far the 4200s I use are producing good results, but I’m nearing the first harvest, so we’ll see about weight.

febisfebi
Well-Known Member
Merlin34
Well-Known Member

Seriously STOKED to see these results. Thanks in advance for the documented comparison.

Will we see the results in your 50000 thread?

Yea, I’ll put them in there. It’ll be a couple months before I start.

GroErr
Well-Known Member
febisfebi
Well-Known Member

Yea, I’ll put them in there. It’ll be a couple months before I start.

Merlin34
Well-Known Member

Yes, we receive a bit of money back from the utility company for firing up 315s instead of 1000s

febisfebi
Well-Known Member
Merlin34
Well-Known Member

Eh, by 60% I’m talking amount of watts to light the same floor space. We’ll see about the yields. If the yields are close then my thoughts are that I saved 685 watts per 16 square foot of floor space.

febisfebi
Well-Known Member

Eh, by 60% I’m talking amount of watts to light the same floor space. We’ll see about the yields. If the yields are close then my thoughts are that I saved 685 watts per 16 square foot of floor space.

Merlin34
Well-Known Member

It’s not a direct 1:1 swap, I was just using that as a comparison. Its probably really a 1.5 315 to 1 1000 swap. So I guess the numbers would equate to closer to a 50% savings in watts now that I think about it, IF yields are comparable. Honestly though, personally, I know what I need to yield per square foot of floor space to make money, that’s all that really matters. And if I can do that with 315s all the better. The other HUGE key is the 6-9% increase in THC that were seeing at another grow we own that is doing head to heads with HPS vs the 315s. That 6-9% is across the board with all the strains we run. But it’s a smaller grow, much smaller rooms, so not really a big warehouse head to head test. That 6-9% increases the crop value, so could and should compensate for a decrease in yield. So there’s a lot of factors in play here when looking at performance, not necessarily grams produced only. On the legal wholesale and dispensary market THC levels dictate price. On the street they do not influence cost per gram as much.

febisfebi
Well-Known Member
borbor
Well-Known Member

Hey everyone, I was looking around today and couldn’t find an answer for this- Will the 210 bulb be fine on any square wave 315 watt ballast like this one?
http://growershouse.com/phantom-cmh-315w-ceramic-metal-halide-digital-ballast
How much would it pull from the wall?
@GroErr I’m guessing you might know?

I wanna put a 210 in my veg tent, to save a little power over a 315 while increasing the coverage and intensity over 2 area 51 rw75s

GroErr
Well-Known Member

Hey everyone, I was looking around today and couldn’t find an answer for this- Will the 210 bulb be fine on any square wave 315 watt ballast like this one?
http://growershouse.com/phantom-cmh-315w-ceramic-metal-halide-digital-ballast
How much would it pull from the wall?
@GroErr I’m guessing you might know?

I wanna put a 210 in my veg tent, to save a little power over a 315 while increasing the coverage and intensity over 2 area 51 rw75s

kcc420
Well-Known Member

I pulled 2.5 lbs per 1k off my scrog setup. u can see my grow journal. Total yield 5 lbs with two 1k lights, i wouldnt even call myself experienced so idk how its not possible. Thats only like 1.15 gpw which isnt insanely impressive. 1.5 gpw is impressive

Im switching to cmh for my larger grow because its ez to hit 1.5 gpw. We are gonna use 24 cmh fixtures to replace 8. 1000’s in hps bulbs. Better light coverage than stretching the 1000s on 4×7 light patterns. Same wattage and power usage for better coverage

stickyickys
Well-Known Member

It’s not a direct 1:1 swap, I was just using that as a comparison. Its probably really a 1.5 315 to 1 1000 swap. So I guess the numbers would equate to closer to a 50% savings in watts now that I think about it, IF yields are comparable. Honestly though, personally, I know what I need to yield per square foot of floor space to make money, that’s all that really matters. And if I can do that with 315s all the better. The other HUGE key is the 6-9% increase in THC that were seeing at another grow we own that is doing head to heads with HPS vs the 315s. That 6-9% is across the board with all the strains we run. But it’s a smaller grow, much smaller rooms, so not really a big warehouse head to head test. That 6-9% increases the crop value, so could and should compensate for a decrease in yield. So there’s a lot of factors in play here when looking at performance, not necessarily grams produced only. On the legal wholesale and dispensary market THC levels dictate price. On the street they do not influence cost per gram as much.

Was that a head to head with DE HPS or standard 1000w (or 600s)?

Merlin34
Well-Known Member

Was that a head to head with DE HPS or standard 1000w (or 600s)?

That was a straight 1000. I’ll have some better concrete yield numbers soon. Looks like we’re pulling a pound a 315 now with room for improvement as we get this beast of a warehouse dialed in.

Mile High Colorado

TheChemist77
Well-Known Member

That was a straight 1000. I’ll have some better concrete yield numbers soon. Looks like we’re pulling a pound a 315 now with room for improvement as we get this beast of a warehouse dialed in.

Mile High Colorado

febisfebi
Well-Known Member

That was a straight 1000. I’ll have some better concrete yield numbers soon. Looks like we’re pulling a pound a 315 now with room for improvement as we get this beast of a warehouse dialed in.

Mile High Colorado

Pretty impressive. Congrats on getting that beast up and running!!
What I am trying to discern, is if there are real advantages to running say 5 (fairly expensive) 315w lights, when compared to simulating the spectral output of CMH with for example 2 DE 1kw lamps paired with supplemental 1000 or 600w Ushio Opti-Blue or similar lamp to cover the rest of the spectrum and end up with something similar to 3100k CMH in terms of total spectral output in the room. This is where we need a side by side comparison. We all know that running full spectrum lighting is going to produce a better product, so comparing to straight HPS (while informative) is not really an apples to apples comparison. Since so few people seem to be supplementing their HPS its difficult to come up with the justification for investment in CMH to replace something like this, since they should be fairly similar quality of light. Given that, (which is not a given, but a speculation) I would further speculate that the 3kw of DE HPS/Opti-blue could potentially produce a similar GPW with similar THC% as the 1575w of 3100k CMH, covering the same area like you are doing. The real difference is cost. In my estimations, it would cost significantly more to get just over half as many watts.

CMH is supposed to be more efficient at converting electricity into usable plant light, so the question then is how much more efficient, and is it worth spending big $$ on. It may be that the savings would come more from decreased cooling costs, so we have to take that into consideration as well. We have to consider the total draw of the room, when doing a head to head comparison.

From what I understand, 1.5 gpw is attainable with plain DE HPS. when you throw the supplemental light in there, the actual GPW might be slightly less, since we are counting watts, and like @Merlin34 said the 6-9% thc level increase is what the supplemental light will be primarily doing for you.

Hopefully someone out there has the time and resources to be able to do a real comparison like this.

Boulder seems to have a hard on for the 3100k bulb (likely have a few thousand in stock?) and is feeding you crap. The 4200k is an Elite Agro, here's the… ]]>