Ceramic Metal Halide (CMH)

[Koondense]

I'm thinking of doing it for some years but never did.
Found some nice prices for the lumatek 315 cmh fixture, but somehow I feel I would prefer a vertical position for the cmh.
The goal is a vertical 315cmh(3100K) in the center with 4 led cobs on the sides, 95w each(dimmable).
Maybe next winter

 

[FletchF.Fletch]

Hortilux 315w CMH flanked by 2 Enjoyield uv/red LEDs.

Barney's Lemon Tree just finished under that combo.

 

[FletchF.Fletch]

This is under HPS and LED.

 

[coxnox]

150(5")x75(2.5")cm with 2x315w philips cmh:

 

[snakedope]

I've been wondering if anyone is doing CMH and LED hybrid grows? I've been running LED for a while now and when I was running COB's I was doing pretty well, but I've moved to the flat panel lighting and there's just something missing. The buds are good, the yields are good, and the smell is good, but it's not great and who doesn't want great? I've not run CMH before but have done a hybrid HPS/LED run out of necessity and lack of supplies over covid which turned out very well. The 250 HPS seemed to fill out the aspects the leds missed, like smell and added temps in winter. I'd imagine a CMH would do this even better, but haven't seen any grows with this yet. I don't want to give up on LEDs, I think there is a lot of potential, but the grass is always greener, or stickier, on the other side right?

One can only wonder ...

 

[Brother Nature]

It's always worth a shot, CMH is the only thing I've not had experience with yet. Most of the growers I admire on here tend to grow with CMH and it would help with adding heat in the winter here. We're in the midst of summer here right now though so I'd have to drastically change my setup and I just don't have the time for it currently. Something like Fletch's setup above looks ideal, one 315 to replace one of my 2 bar LED's leaves me with only 5w less, more canopy penetration, more UV and a little more heating. Always prefer to learn by experience..

 

[zachrockbadenof]

last few grows have been in a 4x3.5ft tent with '2' 315's and phillip bulbs - i'm not impressed , thought we need more light then the 2 cmh's provided - this grow bought a 5x5ft tent with a mars fce8000 set at about 70pct - 33days into 12/12 , and gotta say not impressed with the bud growth - i would say the nodes are closer and not as much stretch, but impressed.... noooo

previous to growing with cmh's, we had a grow room with 4x1000 mh/hps switchable's , and had some truly amazing grows - i'm probably in the minority , but to me cmh/led can't hold a candle to mh/hps...

 

[coxnox]

last few grows have been in a 4x3.5ft tent with '2' 315's and phillip bulbs - i'm not impressed , thought we need more light then the 2 cmh's provided - this grow bought a 5x5ft tent with a mars fce8000 set at about 70pct - 33days into 12/12 , and gotta say not impressed with the bud growth - i would say the nodes are closer and not as much stretch, but impressed.... noooo

previous to growing with cmh's, we had a grow room with 4x1000 mh/hps switchable's , and had some truly amazing grows - i'm probably in the minority , but to me cmh/led can't hold a candle to mh/hps...

too big space for 2x315....i have 2.5x5 with 2x315, it's juste perfect ^^

 

[zachrockbadenof]

too big space for 2x315....i have 2.5x5 with 2x315, it's juste perfect ^^

View attachment 18799272

nice grow - everyone i talk to , as u have said is that 2 315's was enough light - maybe coming from 1000watters turned me off as bud size and resin was lacking... now onto led's, and i think the bud's are smaller, and less resin at 40days then they were under the cmh's...

if i could i'd go back to the 1000watters, but in a tent its impossible... tooooo much heat...

 

[coxnox]

it's not so nice, i will not get yield i usually have, but because it's from seeds and because i get cold nights since 1months....but usually in this tent(5x2.5) i can get from 600 to 800gr of weed, and they look better than under hps(more compact, more resin....but also more leaf).

 

[hillbil]

Still sometimes run an old 250 Retrofit 4000k as an UV supplement to white and white/red LEDs. Still have several NIB bulbs and a couple 400 watt also.