Cheap and Cheerful DIY using Citizen cobs

OneHitDone said:
I don't think all Japanese companies are hating weed - think Iwaski Electric Co ;)
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That brings up a good point, it amazes me how many japanese/Chinese companies produce grow lights, I remember reading the blasphemy of smoking over there and it's supposedly very very frowned upon. Just odd
 
Greengenes707 said:
Japanese may not like MJ, but they do like technolgy, cash, and real wasbe...
Wasbe is a better cash crop than MJ. A few facilities in SF make $$$ growing wasbe indoors under AT lights.
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Hi greengenes707
tell me please what is WASBE. I googled that word, but i still dont know what it is.
something to eat ? or to drink:?
 
klx said:
Dope. What current and what heat sinks you going for?
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Still working out the details. I am working with a company to get a customer power supply (dimmable) that supplies a maximum of 1.3 amps and can run 200 Watts. The standard Mean Well's @1.4 amps do not have the voltage to support 4 1212C's; there off just a couple of volts. @1.3 I can nicely support 4. @1.3A they run about ~47W and @49% efficiency, so generate about 24W heat. I will probably go with some round fin/pin type heat sink. Trying to find best prices. I will let you know what I end up with.
 
Organic Miner said:
Still working out the details. I am working with a company to get a customer power supply (dimmable) that supplies a maximum of 1.3 amps and can run 200 Watts. The standard Mean Well's @1.4 amps do not have the voltage to support 4 1212C's; there off just a couple of volts. @1.3 I can nicely support 4. @1.3A they run about ~47W and @49% efficiency, so generate about 24W heat. I will probably go with some round fin/pin type heat sink. Trying to find best prices. I will let you know what I end up with.
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I tested a handful of the LSD 1.4a driver, rated for 145v on a string of cxa's pulling 149v. They all performed over 1.4 amps and gave the 149v's. Should handle 1212's too.
 
Organic Miner said:
Still working out the details. I am working with a company to get a customer power supply (dimmable) that supplies a maximum of 1.3 amps and can run 200 Watts. The standard Mean Well's @1.4 amps do not have the voltage to support 4 1212C's; there off just a couple of volts. @1.3 I can nicely support 4. @1.3A they run about ~47W and @49% efficiency, so generate about 24W heat. I will probably go with some round fin/pin type heat sink. Trying to find best prices. I will let you know what I end up with.
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Yeah the volts pretty much line up with Veros, a fraction less maybe, I actually should measure mine to get real numbers.

I think 1050ma is the Meanwell sweet spot. That's how I ended up at 700ma with my 1818 build. You might want to run those numbers.
 
Greengenes707 said:
I tested a handful of the LSD 1.4a driver, rated for 145v on a string of cxa's pulling 149v. They all performed over 1.4 amps and gave the 149v's. Should handle 1212's too.
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I was strictly going by the specs and didn't want to assume there was any extra to spare. Nothing worse than buying 20 power supplies that can't drive your cobs.
 
JorgeGonzales said:
Yeah the volts pretty much line up with Veros, a fraction less maybe, I actually should measure mine to get real numbers.

I think 1050ma is the Meanwell sweet spot. That's how I ended up at 700ma with my 1818 build. You might want to run those numbers.
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My idea for using the 1.3A was to be able produce a PPFD from 1200 down to 600 so I can dial-in the optimium light for my grow. It will give me flexability (or that's my thought anyway).
 
Organic Miner said:
I was strictly going by the specs and didn't want to assume there was any extra to spare. Nothing worse than buying 20 power supplies that can't drive your cobs.
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Honestly none of this is very exact, analog tolerances are naturally wide, and running as close to 100% as most people do around here, including me, is probably not entirely wise. MTBF is given at 80% load :).

Vf is +/- 3% according to Citizen, +/- 7% on Crees datasheets (from memory). That's a swing of an entire volt in either direction at 3%. In practice I don't know how far they really vary, mine are practically identical, and line up very well with the datasheet.

I wish I could test like @Greengenes707 but my cobs are within voltage spec, at about 200V on an HLG-120 @ 700ma.

Luckily ventilation is easy to come by for growing purposes, and heat is the real enemy here, as long as the driver is willing to give it the old college try and not fart out.
 
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