dandyrandy
Well-Known Member
Cobkits has gotten my money. In fact I have a package coming. The price on 1212's is crazy. Not the most efficient but run at 35 or 40 watts they work well.
need some advice, please be gentle with me....
- Thread starter Roger A. Shrubber
- Start date
WWmanjr
Member
I use a 4ft light strip that takes regular light bulbs 1600 Lumens each and 6500k light spectrum each for veg. I can get ten bulbs in each fixture, and Im using two of them. Do the math on light strip your talking about vs what I’m using and there is a significant difference!
Chip Green
Well-Known Member
It will contribute to heat removal on a minimal level. Increasing the exposed surface area, increases the ability to "sink" heat. Angle, or U chanel will work better as an actual heatsink, or wider flatbar I suppose.
DonPetro
Well-Known Member
Yea i was thinking of using 1-1/2" wide flat bar attached to a frame.
I suggest two lights, each with 12 strips and an HLG-480H-42AB driver. Prices are reduced on the Gen-2 strips since the Gen-3 started becoming available, so they are great value, especially since no heat sinks or fans are needed.
Most people suggest 30-35 watts/square ft. with efficient LED like the strips you linked. As @Chip Green says, they can be run at 1000ma with no heat sink whatsoever, so 1A x 40v = 40w per strip, or 24 strips to make two 4x4 lights. On a couple occasions, I've simply hung them vertically by the power wires or from the top of a cardboard grow box with string or wire. They can run within a few inches of the canopy due to the excellent distribution of light and heat.
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For the Citizen 1212's or other cobs a heat sink is needed. With LED efficiency declines as power is increased.
dandyrandy
Well-Known Member
But a cheap CPU cooler works well. Don't want to drill? Glue them on. I have 8 veros I've run glued for many years. $12 per cooler. You do need a 12volt supply for the fans. I ran QBs a few cycles. I found it easier to remove the heat with my coolhood design cob. The fins are closed except the ends. Maybe a 2 inch clearance. Then the exhaust fan pulls the air through the 10" wide x42" long beasts. I imagine the QBs mounted on a coolhood design would work better as well. ymmv
Boatguy
Well-Known Member
With the 4' strips, you would have to find a way to support the flat stock in the center unless you went thick with the aluminum. L or U channel wouldnt need the center supports
PSUAGRO.
Well-Known Member
You can run gen7 vero 29 pretty hard (100w) with 120mm+ pin sinks and still maintain above de hps efficacy, decent coverage on a bare cob too..... Just a bang for the buck, not "best" option for everyone.
Strips are going to add better coverage, higher efficiency, lower depreciation @ a higher cost and complexity generally speaking. If I was building in 2020 I would be leaning this way.....
Strips are going to add better coverage, higher efficiency, lower depreciation @ a higher cost and complexity generally speaking. If I was building in 2020 I would be leaning this way.....
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Roger A. Shrubber
Well-Known Member
im thinking about running 16 https://cobkits.com/product/citizen-clu048-1212-80cri-gen6/?attribute_color-temperature=3500K+gen+6
in a 5x5 tent. i'm interested if i can get away with running all of them on one driver, and if so, what driver would that be?
in a 5x5 tent. i'm interested if i can get away with running all of them on one driver, and if so, what driver would that be?
Airwalker16
Well-Known Member
You COULD use an HLG-600H-36A/B running them in parallel. But you really should try to avoid having your entire lifeline of light for your run on one single driver in case it fails. Which happens, trust me. I've had to RMA 4 of mine.
So if it were me, I'd use 3x HLG-240H-36A/XLG-240-L-A MeanWells or go the cheaper route and use 3 LRS-200-36 MeanWells. The extra 120 watts of the HLGs or XLGs would be nice but cost a bit more and the LRS models would need to be separate from your build and just use longer length DC wires to have it outside the tent.
Airwalker16
Well-Known Member
Also, if 3000K is available, I'd use them instead, or at least 8 of those 16. If you do use 8 3500Ks I would go as far as saying use 4 2700ks & 4 3000ks.
Mullumbimby
Well-Known Member
16 is a great number for a 4x4 or a 5x5.
How would you divide the 16 COBs among 3 drivers?
Airwalker16
Well-Known Member
You'd need 18 I guess.
Rocket Soul
Well-Known Member
Try using 2 x320 drivers, or 2 lrs350 if yyour on the cheap
If you wanna finnese it: 200w driver for your corners, upto 50w per cob, and 2x 150w (or a 320 or similar) for the 8 remaining cobs on the sides and then another 150w or so for the centre 4. This way you can fully dial in your even light intensity.