Is 30" tall enough for COBS? If so please advise on my build.

1212ham said:

It will work ok. The current adjustment range for your driver is 3.9-7.8 amps, or 433 to 866mA per strip.

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Vehlor said:

I thought that since it is a CV driver, all I could do is adjust the voltage and then the led would pull what ever current is associated to that voltage. For example if I adjust the voltage to 22.1v, then the led would only pull 700ma, if I adjust the voltage to 22.7v, then the led will pull 1000ma.

So, what you are telling me is that if I connect 9 strips to that driver and adjust the current ouput down to 4.5 amps, each strip is going to pull 500ma at 22.1v, even though 22.1v is associated to 700ma? Isn't this going to damage the led?

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1212ham said:

Keep in mind, those adjustments are limiters. Turn down the current limit and the voltage will drop a bit, turn down voltage limit and current will drop. Study the voltage vs current graph in datasheets. Don't worry, turning down the voltage or current limit can't damage the LEDs.

A poor analogy, volts = water pressure and amps = flow rate or gallons per minute. Turn down the pressure and there will be less flow.

Some good comments from cobkits, he probably explains it better.
http://rollitup.org/t/introducing-cobkits-com-specializing-in-diy-and-citizen-cobs.916763/page-162

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Vehlor said:

Hello

The area of my cabinet is almost 4 square feet (28" x 20") but it is only 34" tall. I want to run 2 x CLU048-1818 or 2 x Vero 29 (50volts) at 80 watts each for a total of 160 watts which should give me over 900 ppfd. Heat sinks are going to be Alpine 64 or 11(cheapest) . I plan to get 3500K 80CRI (maybe 3000K).

1- Is my cabinet tall enough for COBS?
2- What reflector should I use if I go with Vero.

***at first, since I am on a tight budget, I wanted to use a single CLU058-1825 and run it at 140 watts***
3- This is bad idea, right?
4- Assuming it is not a bad idea, is the alpine 64/11 enough for cooling it since it will be less than 90 heat watts?


Thanks in advance for your advice and please excuse my English, it is not my mother tongue.

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Tastybudz024 said:

Just start either training or pruning and start flowering at 5 6 inches

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