DiY LEDs - How to Power Them

jeepster1993

jeepster1993

Well-Known Member
That is a 2x2.5 Gorilla Grow tent. 5 square feet with a 7 foot ceiling. It holds 3 5 gallon bubble buckets(DWC).
I grow tall plants in it, Sativas.
 
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Wezonit

Active Member
jeepster1993 said:
The 120mm sinks are a bit hard to find, I think they're a very popular size.
I think you NEED the pot. That is a dimable driver and I think it needs the pot to complete the circuit.
Expert I am not.
It is a 10K pot. Common and available(Radio Shack, Amazon...)
Click to expand...
Pot not necessary, it will run at full power without one. Also it's 100kohm pot isn't it?
 
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VaperManIsVaping

Member
Hi guys, i'm finally ready to start ordering.

Quick check to see if this will work:

5 CXB3590 + Ideal 50-2303CR + Ideal 50-2300AN + Reflector KB-D82-90RF
1 HLG-320H-C1750
5 pre drilled heatsinks Φ133mm*H70mm(for 50-60W)

I'm going to replace a 400W hps for a 1m² 5 plant scrogg.

My main concern is the heatsinks, are they enough?
 
jeepster1993

jeepster1993

Well-Known Member
You'll be running them fairly hot. Like 65 watts each.
That...is right there. Passive vs active.
Put a fan or 2 blowing on the heatsinks and be aggressive about air circulation.

I am doing the same basic thing, a 3x3 and an HPS 400w.
But I am going with 6 cobs at 50 watts each.
 
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clonekarl

Member
I read up on COBs about a year ago, and I came up with a system like this based on Supra's posts:
(4) CXB3590 3500K CD 36V
(1) HLG-185H-C1400-B
(4) LED reflector with ideal clips
(4) 133mm circular pin-style heatsinks.

I didn't order it last year due to cost. I can now source this for less than $300, so I'm about ready to buy it.

Is this still a good system for a 3'x3' grow space? Could I make better use of 4 COBs with a different power supply? I don't see HLG-185H mentioned much lately. I'm not overly concerned about efficiency, I'd rather have more PAR/$ invested.
 
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VaperManIsVaping

Member
4 on 1400 will give you about 211W and a ppfd of aprox.450.
I think thats a bit to low. The setup i posted is also for this area and has 5 on 1750mA wich nets me +- 680 ppfd for 338W

I always heard you needed about 700ppfd for a 3x3. Please correct me if i'm wrong.
 
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clonekarl

Member
Yes, you're probably right, and when I convert from metric my grow space is 2.1x2.6 ft. Anyway, I'm coming from 220W of PL-L so this will be a nice upgrade no matter what :)

I just wanted to hear if anyone had experience with running these at 1750, whether that is too hot for passive cooling and whatnot. I assume the COB life will be affected as well.
 
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VaperManIsVaping

Member
Actually, thank you!
I changed my order to 4 cob's instead of 5.

This is my order if you are interested:

4 CXB3590 3500K CD + Ideal 50-2303CR + Ideal 50-2300AN + Reflector KB-D82-90RF
1 HLG-240H-C1750B
4 Φ150mm*H70mm(for 60-70W) heatsinks
1 1-10V Dimmer for MW and Pairui driver

This gives me a total PPF of 548.7. That corresponds with a 400W hps, but you gain 137W at the wall!
A roi of 2 years makes this a no brainer!


@clonekarl : I have a friend running this exact setup. He also replaced his 400W hps Gavita.
 
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clonekarl

Member
Haha, you're welcome man :) I have the exact same parts, but I was just gonna slap on a pot meter. What's this Pairui, some sort of PWM?
 
jeepster1993

jeepster1993

Well-Known Member
The wait...
I am waiting too.
I have everything needed but 1 part, on order, so we wait.

I do have enough to start building.
This is where I am.
6 cree 3590(3500K)
6 holders, mounts and reflectors
6 140mm x 110mm passive heatsinks.
1 home made frame at 28 x28 inches
1 Meanwell 320/1400 driver, to drive at 54 watts x 6 cobs.

This setup will yield me about 34 watts per square foot. Not the best, but I have an 80 watt stick led light with deep red, IR, UV in it, so will supplement with it.
 
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Diysystem

Member
Hi guys. Doing the CLU046-1212 cobs to get started before upgrading to cxb. Anyone know what wattage the cobs go at on 400mA and 700mA?
 
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