CMH vs LED vs HPS

[Hammerhead]

HLG doesn't have UV diodes on there older Diablo 650 boards. They do offer a UV addon bar, that's what I have. I don't see any UV chips on Mars either. I can't say if this helps? CMH has UV.

Ceramic Metal Halide CMH 315W Lamp Comparison Test Data & Review

<iframe src=

growershouse.com

I want to first and foremost lets clarify one point - CMH is NOT a Metal Halide Lamp. Most people think Metal Halide Lamp, "I know what that is.. ok this lamp is made for veg."

No, that's not true. Lets take a look at a Metal Halide Lamp. A CMH lamp has a different emitter than a normal metal halide lamp, which is built of Quartz. Inside a CMH there is a ceramic component. So the difference is this - A ceramic tube is able to withstand much higher temperatures. Many manufacturers are saying the higher arc tube temperatures happening inside the lamp allow for more color stability, better lumen per watt ratios and effectively an all around better bulb in comparison to the HPS metal halide. We're talking about how many photons of light you're getting to your plant in the usable spectrum per watt of input, which is really the way you want to measure efficiency for your lamps.

CMH lamps burn just like a normal Metal Halide Lamp. There are salts inside of the arc tube that heat up to a high temperature and that give off a certain spectrum. But, since the salts inside a CMH are able to heat up to much a high temperature they're actually turned into what resembles plasma. Plasma burning at this higher temperature has the effect of providing a spectrum that is much wider and better than traditional HPS or metal halide lamps.

 

[Cerathule]

To be fair, a MH can have close the same spectrum as a CMH but it will be more spikey and less warm, this is due to the CMH ability to use more "rare earth" elements and esp. sodium which then give off this particular wavelengths.
And you can flower also completely under MH, some will just leave it in for 3 weeks after flip to suppress the stretch a bit, others use for the last 2 weeks for the increased UV.
Inside the .pdf you find alot MH CMH HPS spectras taken from Madrid's streetlights

 

[JKD]

Gents,
This thread has all the potential to turn into a "mine's bigger than yours" and it already is in some of the comments.

Some of us even started arguing about meat

 

[goingrey]

Lumatek 315W ballast any good?

 

[Hiddenjems]

It’s crazy, peoples views on the world.

I wouldn’t touch grain fed commercialised farmed beef. Not matter what the marbling looks like. Because I care about our earth. Organic grass fed all the way!

Fuck your kobe beef

I know people with home farms that grain their cattle with corn they grew. Not very commercialized.

Different people like different things. Hell some people’s favorite burger is McDonald’s.

It’s never people that actually live in rural areas that farm, fish, and hunt sustainably from the land that go off on people online anbout “the earth” either.

 

[Hiddenjems]

Some of us even started arguing about meat

I found this thread because I’m considering replacing 8 1000w hps lights with led. Of course I’d start with just one 4x8 tray and compare.

But, I think I was just at the store mad at myself for not going in on a side of beef with my brother because my deep freeze broke. The price of beef is ridiculous.

Fwiw I buy local meat usually, grass fed and grained. The luxury cuts I always go for grain, but burger and roast has more of a taste when grass fed, and it’s cheaper.

 

[Brother Nature]

I found this thread because I’m considering replacing 8 1000w hps lights with led. Of course I’d start with just one 4x8 tray and compare.

But, I think I was just at the store mad at myself for not going in on a side of beef with my brother because my deep freeze broke. The price of beef is ridiculous.

Fwiw I buy local meat usually, grass fed and grained. The luxury cuts I always go for grain, but burger and roast has more of a taste when grass fed, and it’s cheaper.

There's a post a few pages back from crooked8, he detailed his moves to and trials of different lighting and why he decided on LED's over the other options out there. It's pretty informative.

I love a good Wagyu steak myself...

 

[Crooked8]

Gents,
This thread has all the potential to turn into a "mine's bigger than yours" and it already is in some of the comments.
This was the OP's (Gerardbutler....)question:
"I wanted to get input on the results you guys are getting with these in the finished product. I've had great results in the past with HPS supplemented with additional UVB from a zoologist mega ray bulb. I'm wondering if the CMH provides enough UVB on it's own if used in bloom?"

As per to what the thread has somewhat evolved, I'm an LED aficionado who used to grow under HID lamps and after many runs under LEDs now says that he likes the results under LED better.
I don't need to be schooled by someone who says he knows that his way is the only truth, although I'm very open to new, interesting findings that help me get better.
And I'm not even sure if my lights have any UV diodes at all. I too would be interested if I can/should supplement some UV radiation?

CC

This is why I feel showing product from its light source makes sense. And why the end products quality and yield/size/shape of biomass is the most important thing to focus on. 1. What light was used? 2. What grow/media method. 3. How did the end result turn out?

Thats what I think we should all focus on.

For Instance, this is a smaller project we built. Its mostly led but some boulder lamp cmh 315s. Arranged over 3x6 trays. 2 trays have cmh and 3 have Leds. But ill list it this way….

1. Boulder Lamp CMH 315w
2. Dwc in rockwool unislabs
3.

Starbud sister x biker og, at 8 weeks of flower.

 

[Crooked8]

1. Boulder Lamp 320w Leds
2. Dwc in rockwool unislabs
3.

At 6 weeks of Flower, same strain..

 

[420empire]

More Chunkin' looks nice. !
So crooked8 would you favor all the aspect of that bud, by this i mean: growth, taste, High you know. I would say hands down High/ taste is the most important in my little black book.

 

[Crooked8]

I think everything is enhanced under Led personally. Taste, high, yield vertical growth pattern and more. If you like ogs like i do they can be stretchy, the right leds really aid in reducing that and having them stack.

 

[exoticrobotic]

Yield is definitely enhanced under LED and they certainly help reduce stretch but with the 5 or 6 strains ive tried under both cmh and led, taste and potency were much more enhanced under CMH.

The strains i tried under both were THH, MNS afgHz, a bubble gum, sensi black domina, some krypt bubba x abusive.

All in all about 20 different plants.

When i ran them under led after a while they all cure to merge their taste like a fine cigar. Hard to taste the individual terps.

When i ran them under cmh after a while they all tasted amazing still. Could easily taste 5 or 6 diff flavours in the Bubba x Abusive.


But ya know, it's horses for courses innit

 

[exoticrobotic]

I also find the texture of the buds very different under cmh vs leds.

More fibrous under led with more stalk in the buds.

cmh bud crumbles to a resinous dust with mostly flowers and less stems stalks etc.

 

[Chevy cHaze]

That's interesting, so only a couple hours could be enough... Does anyone experience more or quicker amber trichs supplementing UV? I had the feeling in the past that plants produce amber trichs later under LEDs than under HIDs... but that's not backed by science here on my side

 

[snakedope]

I also find the texture of the buds very different under cmh vs leds.

More fibrous under led with more stalk in the buds.

cmh bud crumbles to a resinous dust with mostly flowers and less stems stalks etc.

Yes most of LEDs buds share the similarities of dry resin, hairy stalks, overall dry feel not gluey feel like you described, blue purple colors and foxtails, sure HIDs also make foxtails but with LEDs it's on the whole plant mostly, something we are used to see on top of plants mainly.
I have to admit crooked8 has some fine dialed grows under his LEDs, my only wish is to smoke them haha and resolve this case for good.

 

[goingrey]

That's interesting, so only a couple hours could be enough... Does anyone experience more or quicker amber trichs supplementing UV? I had the feeling in the past that plants produce amber trichs later under LEDs than under HIDs... but that's not backed by science here on my side

The two "strategies" for UV supplementation seem to either be a little for a long time or a lot for short periods of time.

Think there is a theory that it is the other end of the spectrum, far red, that speeds up flowering.

 

[snakedope]

That's interesting, so only a couple hours could be enough... Does anyone experience more or quicker amber trichs supplementing UV? I had the feeling in the past that plants produce amber trichs later under LEDs than under HIDs... but that's not backed by science here on my side

I think amber is not the point, as I've seen amber under LEDs with ease, it's just the globe of the trich is too small in my opinion,
I think Yellow canary said it, all neck no head, in the past it was all head no neck
I tend to believe this notion as it's visible in real life, pictures, smoke test, you name it

 

[Hammerhead]

Lumatek 315W ballast any good?

Ive had 2 failures over time. The 1st to fail was Phantom. Even the cheapest ballast(Prism) Ive bought has lasted 5 years+

Prism Lighting Science 315w Ceramic Metal Halide CMH Ballast 120/240v | eBay

Low Mains frequency 50/60 Hz. End of Lamp life, short circuit, open circuit, ignition failure and thermal protections for safety. 120 and 240v cords included. ThePrism Lighting Science CMH Ballast was made to have all the features and technology needed for optimal performance with none of the...

www.ebay.com

 

[Airloom]

HLG doesn't have UV diodes on there older Diablo 650 boards. They do offer a UV addon bar, that's what I have. I don't see any UV chips on Mars either. I can't say if this helps? CMH has UV.

Ceramic Metal Halide CMH 315W Lamp Comparison Test Data & Review

<iframe src=

growershouse.com

I want to first and foremost lets clarify one point - CMH is NOT a Metal Halide Lamp. Most people think Metal Halide Lamp, "I know what that is.. ok this lamp is made for veg."

No, that's not true. Lets take a look at a Metal Halide Lamp. A CMH lamp has a different emitter than a normal metal halide lamp, which is built of Quartz. Inside a CMH there is a ceramic component. So the difference is this - A ceramic tube is able to withstand much higher temperatures. Many manufacturers are saying the higher arc tube temperatures happening inside the lamp allow for more color stability, better lumen per watt ratios and effectively an all around better bulb in comparison to the HPS metal halide. We're talking about how many photons of light you're getting to your plant in the usable spectrum per watt of input, which is really the way you want to measure efficiency for your lamps.

CMH lamps burn just like a normal Metal Halide Lamp. There are salts inside of the arc tube that heat up to a high temperature and that give off a certain spectrum. But, since the salts inside a CMH are able to heat up to much a high temperature they're actually turned into what resembles plasma. Plasma burning at this higher temperature has the effect of providing a spectrum that is much wider and better than traditional HPS or metal halide lamps.

Thanks for the explainer. I’m itching to give the CMH a shot

 

[Airloom]

I also find the texture of the buds very different under cmh vs leds.

More fibrous under led with more stalk in the buds.

cmh bud crumbles to a resinous dust with mostly flowers and less stems stalks etc.

I’m liking this “crumbles to a resinous dust” followed by the forecast “mostly flowers”
No stems no seeds that you don’t need….