CLU048-1212C4-353H5M3-F1 with HLG-185H-C1050B

Hey guys I was wondering if what I had in mind would be a good idea for a 3.3'x3.3' tent (1m2 tent).

I would like to run 2 HLG-185H-C1050B (runs at 190V) with 5 CLU048-1212C4-353H5M3-F1 (Fv≃34V) cobs each.

That would be, if I'm not mistaken, that each cob would be runnig at 38V giving 39.9W/each giving a total of 399w at the wall.

I would be running D133 x H70 mm pre-drilled pin fin heatsink in each cob just to make sure heat is not a problem thus providing even more efficiency. I like the efficiency this setup provides as I think it might be near 60%.

Idk guys do you guys think this is a good set up for a 1m2 tent? I would veg and flower in the same tent dimming the cobs during veg. If you think there is a cheaper way to get the same numbers or just a better setup please do not hesitate I'm here to listen you all.

Thank you very much.

Arnau.

I'll add @CobKits

Sounds good

Thank you @Porky101 any thoughts on how to distribute 10 cobs evenly in a 1m2 square (3.3'x3.3')

That's more than enough to do a fantastic job. 10 cobs is great spread too. You'll kill it with that.

Airwalker16 said:

That's more than enough to do a fantastic job. 10 cobs is great spread too. You'll kill it with that.

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Thank you so much. I really appreciate the comments. Having ppl support your thoughts is always a good thing thank you so much guys.

Would you guys use angleine reflectors in this setup?
I dont think they are needed due to the fact that I'll be using 10 cobs in a 3.3'x3.3' so coverage will be good. However I would like to hear ppl with more knowledge.

That's a really good setup for one squaremeter, mate. No need to worry about anything! You don't need reflectors inside a tent. They are only useful if you have to bridge a large gap between lamps and canopy. Inside a tent they only cause hotspot. When you distribute the COB's the goal is to get an even coverage and almost the same brightness across the whole canopy with no center hotspot. You could use 4 rows, 2 rows with 3 COB's each on the sides and 2 rows with 2 COB's in between but no COB's in the middle. Something like this would work. You could build a frame to mount the heatsinks and could push the center COB's more outward if it's still too bright in the middle or further in the middle if vice versa.

Randomblame said:

That's a really good setup for one squaremeter, mate. No need to worry about anything! You don't need reflectors inside a tent. They are only useful if you have to bridge a large gap between lamps and canopy. Inside a tent they only cause hotspot. When you distribute the COB's the goal is to get an even coverage and almost the same brightness across the whole canopy with no center hotspot. You could use 4 rows, 2 rows with 3 COB's each on the sides and 2 rows with 2 COB's in between but no COB's in the middle. Something like this would work. You could build a frame to mount the heatsinks and could push the center COB's more outward if it's still too bright in the middle or further in the middle if vice versa.
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I really apprecite your comment and the time you spend. You cleared every doubt I had left thank you so much. Much love from Spain.

ArnauVM said:

Would you guys use angleine reflectors in this setup?
I dont think they are needed due to the fact that I'll be using 10 cobs in a 3.3'x3.3' so coverage will be good. However I would like to hear ppl with more knowledge.

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RapidLed has canopy frames for COBS if you don't want to build .

Dave455 said:

RapidLed has canopy frames for COBS if you don't want to build .

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I know thank you but I'll have to build a custom frame for an even distribuition of 10 cobs.

Alu L channels would work and you'll get them pretty cheap. With some luck at the kilo price from the next scrap yard.
If you want something more beautiful use alu profiles; 2020 or 3030 profiles are available anodisized to different colors.
(Black, blue, green,..)

ArnauVM said:

I know thank you but I'll have to build a custom frame for an even distribuition of 10 cobs.

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Randomblame said:

Alu L channels would work and you'll get them pretty cheap. With some luck at the kilo price from the next scrap yard.
If you want something more beautiful use alu profiles; 2020 or 3030 profiles are available anodisized to different colors.
(Black, blue, green,..)

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Yes I was going to go with the star shaped 2020 alu bars anodizied in red with anodisized black heatsinks. It's going to look cool

Hey guys, I'm ready to start my first cob grow but one or two questions in mind as I've never used them:

During veg and with this set up, how much would you dim the cobs and which height would you hang them?

During flower full power but which hight should I hang them?

I don't have any way to mesure PPFD whatsoever so I dont really have a way to hang them by numbers.

Thank you guys.

Start with 24" height and 50% and slowly reduce the distance. 12-18" is often used with 50w COB's but you need to look at the plants carefully. It:s important to keep the VPD in check because air tends to dry out with intense light.
Optimal temps are 80-85°F and 60-65% RH between the plants. I would use a temp/humidity sensor with wired probe and hang the probe directly above the canopy to get an idea of the real humidity around the plants.
Sonoff has the models TH10 and TH16 which are digital timers with temp/humidity monitoring. The timers are controlled by an easy to use app called eWelink. You can either use them to drive a heater/cooler(by temps) or an exaust fan/dehumidifier (by humidity) or you set it up by timer settings. Sonoff + temp/humidity sensor are ~12 bucks.

https://www.itead.cc/smart-home/sonoff-th.html

There are other controllers available you could use to switch the lights on and off. A single channel Sonoff is ~5$, a dual 10$ and a 4-channels controller costs around 25. I'm using a few different versions and like them.

Dude that cleared my hanging and dimming doubts and even helped with my temp and humidity set up I'll definitely cheking Sonoff.

Thank you so much.

ArnauVM said:

Dude that cleared my hanging and dimming doubts and even helped with my temp and humidity set up I'll definitely cheking Sonoff.

Thank you so much.

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No probs, mate!
There are a few things which are a little different when growing with LED but It is pretty easy to pay attention to that and adjust the controller / timer accordingly.

I recommend to read this about leaf temps with different light sources...
https://www.blackdogled.com/lst

and this about VPD..
http://www.just4growers.com/stream/...-deficit-the-hidden-force-on-your-plants.aspx

If you pay attention to these two things you will be amazed what is possible with LED...

If you have 10 COBs a over a square meter then they should be at a maximum of 10" high. I ran the same with 9 COBs on a square meter.

The correct height of the light is determined by getting adequate uniformity. Nothing else.

If you want to give the plants less light during veg then do not change the height. That's just a wast of light on the walls. Dim the light to whatever you feel is best for the plants. I pretty much go for 100% from the time they are about 6 nodes high. Before that they are not in my flower tent anyway. Others like to give the plants less light during veg. Or use lower intensity and then 18 hours for a similar daily amount of light with higher intensity over 12 hours during flowering.

Still, whatever the reason to use lower intensities, it's a waste of electricity if you hang the lights high to reduce the amount of light.

Yeah, I do not even start on 24" since a while but sometimes it's easier for the plants to get used to intense LED light especially if you've grown them up under T5 or so. As soon as they can handle the light you can lower the height to the point where you get an even distribution.
Even better if you take B version drivers dimmable down to 10%.
The difference in vegetative growth at irradiance levels from 25,000lx and 50,000lx is only 10-15% but you use twice as much energy. Make a comparison and grow 2 clones side by side, one with 25klx and the other with 50klx. You will see that the difference within two weeks is much smaller than you think ..
Many ways lead too rome. Everyone has to find out for themselves how much light a specific strain needs and what happens when using too much. And to make things even more difficult each variety has its own requirements.
I've currently a few SuperLemonHaze and Bubba's Gift cuttings in my tent and while the SLH likes the light-mix with ~30-40kJ/m² UVB and pray all day long the BG's looks stressed and you can see how they try to keep the upler leafes away from the light. I literally learn something new about this wonderful plant with each new strain.