Cob vs hid lighting

[TreeFiddy350]

which do you think is better and why? My buddy keeps saying cob is better than mh/hps for growing.
I’ve never used cob, only hid and had great results.
Can cobs really do better than hid?

 

[toaster struedel]

I'm half way thru flowering since I made the switch from hps to cobs. Plants are a lot frostier under the cobs. And plant stretch is no where near what hps was causing. And my elect bill is down more that $100 this month. The jury's still out till harvest, but so far I'm loving the cobs!

 

[TreeFiddy350]

I'm half way thru flowering since I made the switch from hps to cobs. Plants are a lot frostier under the cobs. And plant stretch is no where near what hps was causing. And my elect bill is down more that $100 this month. The jury's still out till harvest, but so far I'm loving the cobs!

How much would a cob equivalent to 1000w hid mh/ hps?

 

[TacoMac]

which do you think is better and why?

Neither. They both do very effective jobs if they're properly matched to the grow in question. The problem is that quality COB fixtures are roughly 3 to 5 times the cost of a typical MH/HPS fixture which makes them cost prohibitive unless you're either doing very, very large grows or live in a very, very expensive power grid area.

How much would a cob equivalent to 1000w hid mh/ hps?

About 650 - 750 watts of quality COB or thereabouts will match a 1000 watt MH/HPS.

 

[TreeFiddy350]

Neither. They both do very effective jobs if they're properly matched to the grow in question. The problem is that quality COB fixtures are roughly 3 to 5 times the cost of a typical MH/HPS fixture which makes them cost prohibitive unless you're either doing very, very large grows or live in a very, very expensive power grid area.



About 650 - 750 watts of quality COB or thereabouts will match a 1000 watt MH/HPS.

How much do you think it would cost to build/ buy one of these? Right now I’m looking at hid light fixture and ballast for like 180 each. 1000w dimmable

 

[TacoMac]

How much do you think it would cost to build/ buy one of these? Right now I’m looking at hid light fixture and ballast for like 180 each. 1000w dimmable

There are several threads in the LED section that deal with building good, quality COB fixtures. You need to look there to get some ideas. I've heard of guys building really nice ones for around 300 to 400 dollars. To buy a good, pre-built Timber COB to match a 1000 watt MH/HPS would run you 800 to 900 dollars.

 

[TreeFiddy350]

There are several threads in the LED section that deal with building good, quality COB fixtures. You need to look there to get some ideas. I've heard of guys building really nice ones for around 300 to 400 dollars. To buy a good, pre-built Timber COB to match a 1000 watt MH/HPS would run you 800 to 900 dollars.

lll def look into it for sure. I seen those, but was just wanting to get a price range idea. Thanks for the help brotha!

 

[Renfro]

Well COB won't put out any UV and the UV really helps boost resin content and THC.

 

[Renfro]

Also you need to use about the same wattage per sqft with LED and HPS so IMO go with HPS.

 

[TacoMac]

Well COB won't put out any UV and the UV really helps boost resin content and THC.

Fun fact: plants only use visible light for photosynthesis. They don't use UV or infrared at all. In fact, UV can hurt plants if you have to much of it, hence why some burn the shit out of their plants by putting HPS lighting too close to the plant without a glass shield on it.

 

[Renfro]

The right amount of UV light definitely increases resin and THC production.

 

[TacoMac]

The right amount of UV light definitely increases resin and THC production.

No, it doesn't. The plant can't even use it. But do continue to believe voodoo shit you read on the internet.

 

[gwheels]

I have grown under 315CMH cobs and samsung and all 3 have amazing trich coverage...so the 315 is not frostier.

Just an observation.

And I would love to run HPS in my 5 1/2 foot ceiling but the others can get far closer..Lighting is very specific to need.

 

[Aladdin.khalifa]

which do you think is better and why? My buddy keeps saying cob is better than mh/hps for growing.
I’ve never used cob, only hid and had great results.
Can cobs really do better than hid?

Hello tree friddy,

Like @TacoMac said, they are very different and both have advantages and drawbacks.

The Cod can help you minimize the stretch because it is usualy higher in blue spectrum than most HIDs.
So it it great if you are growing pure Sativas. Likewise, you'll usualy get denser buds under a COB light.

However, their high cost often surpasses the power savings. Also, HIDs cover a larger area and give bigger buds.

Cheers,

 

[OneHitDone]

Fun fact: plants only use visible light for photosynthesis. They don't use UV or infrared at all. In fact, UV can hurt plants if you have to much of it, hence why some burn the shit out of their plants by putting HPS lighting too close to the plant without a glass shield on it.

I think your head might be up your ass, you sure have things backwards. It is the infrared radiation from hps that burns plants, not UV.
Pretty much everything you say form here forward will be taken with a grain of salt

 

[DangerDavez]

Fun fact: plants only use visible light for photosynthesis. They don't use UV or infrared at all. In fact, UV can hurt plants if you have to much of it, hence why some burn the shit out of their plants by putting HPS lighting too close to the plant without a glass shield on it.

Their is limited research but Dr Bruce Bugsbee of Apogee is saying that in his testing, UV in small quantity has improved a plants water/nutrient uptake and he's noticed hardier plants.

Ive always been of the opinion that the sun has the ideal spectrum as plants have adapted to them over time. Something like 15 percent of its light ranges from 300 to 390 NM.

That being said, I've never implemented it and have had good success so is it really essential? Not really

 

[DangerDavez]

Hey 350

Both have advantages and disadvantages. I'm going to discount the cheap blurple LEDs here because they really aren't any better than a good HPS. I'll focus on Cobs and white SMDs here.

LED:
Efficiency up to ~2.20 umols per watt.
Ability for manufacturers to tune spectrum
Potential for more even light spread eliminating hot spots
Long life
More expensive
Not a fully mature technology so it will keep improving

HPS
Efficiency up to 1.40 umols/w
Less expensive up front cost
Mature technology with a proven track record
Must replace bulbs so potentially more expensive in the long run

Theirs been tons of discussion here in the past on this subject so you can always do a quick search and get tons of information. I'm of the opinion that LED is the way to go if you can afford a high quality system or if you can DIY.

 

[GoBrah]

Hey 350

Both have advantages and disadvantages. I'm going to discount the cheap blurple LEDs here because they really aren't any better than a good HPS. I'll focus on Cobs and white SMDs here.

LED:
Efficiency up to ~2.20 umols per watt.
Ability for manufacturers to tune spectrum
Potential for more even light spread eliminating hot spots
Long life
More expensive
Not a fully mature technology so it will keep improving

HPS
Efficiency up to 1.40 umols/w
Less expensive up front cost
Mature technology with a proven track record
Must replace bulbs so potentially more expensive in the long run

Theirs been tons of discussion here in the past on this subject so you can always do a quick search and get tons of information. I'm of the opinion that LED is the way to go if you can afford a high quality system or if you can DIY.

litte update,
good HPS 400W around 1.75umol/w, 600W around 1.85umol/w, 1000W 1.9~2.1umol/w
good cmh 315 or 630w 3k around1.95umol/w 4k around1.85umol/w
cmh1000 3k 2.0~2.1 umol/w 4k 1.9~2.0umol/w

 

[Rocket Soul]

No, it doesn't. The plant can't even use it. But do continue to believe voodoo shit you read on the internet.

Its not that its using it to photosynthesize, but it will react to it. Adding UVB will raise thc about 20% relative to base line.

IR: plant wont use it for photosynthesis but it does act on the plant: it helps regulating transpiration and it will boost metabolism if the plant is not allready warm enough.

As for led vrs hps: we did a not really perfect first run, 32w /square foot of high efficiency led boards and got 1.7 grams/watt or about 50grams per square foot and we are expecting to improve more on this. Hps was less yield with more watts.

Both are good for growing, hps less complicated as long as you can control the heat. But a well designed and setup led will grow the same or more but with half the watts. But you need to be able to control environment completly.

 

[Warpedpassage]

On the subject of uv, i have read and heard about uvr8, a uv b sensing protein. When it senses uv b range it triggers plant stress response. In canna it has has been proposed it increases certain cannabinoids such as thc.
Here is a study https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1751-1097.1987.tb04757.x