DiY LED - Cree CXA3070

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Skaumannen

Well-Known Member
Do you know the voltage range for that driver? I bought the meanwell lpc-60-1400. I also bought them from eBay, but they are a little more expensive. And 1,5 amp will give a little over 50 watt per led
 
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BuddyLeeCU

Member
Skaumannen said:
Do you know the voltage range for that driver? I bought the meanwell lpc-60-1400. I also bought them from eBay, but they are a little more expensive. And 1,5 amp will give a little over 50 watt per led
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It says 25-38. Digikey test voltage for cxa30xx is 38.5 so not far off, but digikey is almost 2 amps. The 1750 model mean well is close to digikey specs but the 1400 comes up way short.
 
bicit

bicit

Well-Known Member
Driving the led softly (using less current, or 'amps') is the key to high efficiency, especially with the cxa cobs. Just make sure the Vf of the led at your chosen drive current falls within the voltage range of the driver.
 
stardustsailor

stardustsailor

Well-Known Member
bicit said:
Driving the led softly (using less current, or 'amps') is the key to high efficiency, especially with the cxa cobs. Just make sure the Vf of the led at your chosen drive current falls within the voltage range of the driver.
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Not quite/ absolutely true ...
Depends on the drivers used ...
Higher efficiency,yes, regarding the operation of the leds/arrays ..
Not necessarily the whole system's efficiency ...
 
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Skaumannen

Well-Known Member
BuddyLeeCU said:
It says 25-38. Digikey test voltage for cxa30xx is 38.5 so not far off, but digikey is almost 2 amps. The 1750 model mean well is close to digikey specs but the 1400 comes up way short.
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Are you talking about the cxa3590 or the cxa3070 here? because the Meanwell LPC-60-1400 has a Vf range of 9-42V, and that is well within the range of the cxa3070. I am currently running 4x CXA3070 @ 1400mA in a 2,4x2,4 tent, and even with my very limited growing skills, the growth i have is very good.
 
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BuddyLeeCU

Member
Skaumannen said:
Are you talking about the cxa3590 or the cxa3070 here? because the Meanwell LPC-60-1400 has a Vf range of 9-42V, and that is well within the range of the cxa3070. I am currently running 4x CXA3070 @ 1400mA in a 2,4x2,4 tent, and even with my very limited growing skills, the growth i have is very good.
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Talking about the driver that was linked to from ebay. You're running about 75% of the listed amperage, I'm wondering if anyone has tested lumen output with the lower amperage meanwell or equivalent and a higher output driver closer to the 2 amp mark?
 
bicit

bicit

Well-Known Member
stardustsailor said:
Not quite/ absolutely true ...
Depends on the drivers used ...
Higher efficiency,yes, regarding the operation of the leds/arrays ..
Not necessarily the whole system's efficiency ...
Click to expand...
Agreed, should have been a bit more specific. It was a bit of a drive by post.
 
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Skaumannen

Well-Known Member

This is one of SupraSPL's spreadsheets and it shows the lumen output of the cxa3070 AB bin at different currents (lm50c), i think these numbers are taken from some documentation posted by cree, but i am not sure about that. Maybe supra or one of the other users here can answer that one.
As far as i have understood most people stay between 700 and 1400mA, since this gives a decent price/watt with good efficiency. My setup is quite small, and i have more problems with low temperatures, so i opted for the higher amperage.
Stardustsailor uses a more efficient and dimmable driver for his builds (but more expensive) that can do 350-1950mA. Meanwell HLP-80H-42. Stardustsailor has made some really good looking lights, you should check out his thread "thinking of a new light" if you have not seen it already.
 
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BuddyLeeCU

Member
Skaumannen said:

This is one of SupraSPL's spreadsheets and it shows the lumen output of the cxa3070 AB bin at different currents (lm50c), i think these numbers are taken from some documentation posted by cree, but i am not sure about that. Maybe supra or one of the other users here can answer that one.
As far as i have understood most people stay between 700 and 1400mA, since this gives a decent price/watt with good efficiency. My setup is quite small, and i have more problems with low temperatures, so i opted for the higher amperage.
Stardustsailor uses a more efficient and dimmable driver for his builds (but more expensive) that can do 350-1950mA. Meanwell HLP-80H-42. Stardustsailor has made some really good looking lights, you should check out his thread "thinking of a new light" if you have not seen it already.
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What are the $ down the far right representing? It seems that at 1.4 amp or higher your eff really takes a crap, but much less than that and you lose a ton of output.
 
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reasonevangelist

Well-Known Member
Abiqua said:
Yep....the 3k AB's are 46....and available....Personally want to grab up the AB3500k's @36 apiece, very nice...

I was looking last night/early this morning prices and selection is better than just about anywhere else at the moment..

https://parts.arrow.com/item/search/#st=cree cxa3070;reMzFE
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clicked that link... all the relevant parts codes are cut off. Everything ends with "000N0H" or "000N00." You have to click each thing to know which is which. If "AB30H" is what i'm looking for (3000k?), it says 20 min order quantity. So if you want to spend $900 on 20 of them, right on. :) (they're showing only 40 in stock, so only 2 people can order... unless they're willing to sell singles)

You could probably sell the AB 3000k's as singles for a decent bit more... i bet some people would be willing to pay up to ~$70 each for AB singles... not me though. ;)
 
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reasonevangelist

Well-Known Member
David Pasta said:
I need light to an area 1.4 m 2.I am a Czech ,how much is it in your size?One is quite low.
Growbox:http://www.ebay.com/itm/Growbox-Growschrank-Gewachshaus-Growzelt-Zuchtschrank-120x120x200-cm-/361073489746?pt=LH_DefaultDomain_77&hash=item5411a83752
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With that tent, i'd want 4 cobs @1A. You don't have to fill the whole tent though. With that tent, you could get just one or two cobs and grow one really nice plant, with plenty of space to let it breathe. Or, you could go scrog on one plant, use 4 cobs for that space. You could even use just 2, but the edges would get significantly less light, while those directly beneath the lamp will dominate the space, making everything else thin and stretchy (not necessarily bad quality though).
 
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