my thoughts on the cree cxa

HolyGhost23

HolyGhost23

Well-Known Member
It seems like it would be about on par with an hps of the same wattage. Maybe slightly more efficient simply due to how the light is scattered.

I got a unit built to my specs by Supraspl the light was 2 cxa 3070s running at 2.1 but I thinks 2.5 or that's what I get with my amp meter. Each so about 210ws total. And well.. Yes I did add some cheap par 38s for side lights..

The results speak for themselves
Its my first dwc grow to boot
 
apoulin

apoulin

Well-Known Member
HolyGhost23 said:
It seems like it would be about on par with an hps of the same wattage. Maybe slightly more efficient simply due to how the light is scattered.

I got a unit built to my specs by Supraspl the light was 2 cxa 3070s running at 2.1 but I thinks 2.5 or that's what I get with my amp meter. Each so about 210ws total. And well.. Yes I did add some cheap par 38s for side lights..

The results speak for themselves
Its my first dwc grow to boot
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What driver are you using and is that 2.1A total or 2.1A each? Lol I guess the first question might answer my second bongsmilie
 
HolyGhost23

HolyGhost23

Well-Known Member
youd have to ask supra on that one.. its some chinese no name for sure... but its pushing 2.5 amps at 40V's
2.5 amps each cxa

P(W) = I(A)× V(V)


2.5A x 40V= 100W but i think its putting out slightly more than 40V's
 
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apoulin

apoulin

Well-Known Member
I bought one 3070 myself and have it set up with a driver running 37v @ 1.2A, so about 45w(Thanks to Supra as well:clap:) running cool and bright. I have been thinking of purchasing a few more 3070's before my babies are ready for flowering. Nice results, you have inspired:weed:
 
HolyGhost23

HolyGhost23

Well-Known Member
apoulin said:
I bought one 3070 myself and have it set up with a driver running 37v @ 1.2A, so about 45w(Thanks to Supra as well:clap:) running cool and bright. I have been thinking of purchasing a few more 3070's before my babies are ready for flowering. Nice results, you have inspired:weed:
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jsuk I am a newb at indoor growing, plus that's my first dwc attempt.. im sure someone with more skill could get better results.. though i think my light is kinda special.. doesnt seem like people are using less with more wattage.. and you do the math.. well my light is the cheapest, yet most powerful option...i kind of had it designed that way.. and supra is aN LED god.. he really should show those area 51 guys WTF is up...DUDE START A COMPANY..like legit.. you need investors in the future...I know people ;)
 
apoulin

apoulin

Well-Known Member
@HolyGhost23 though i think my light is kinda special.. doesnt seem like people are using less with more wattage.. and you do the math..
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Are you saying that your light is special in that you are running fewer COBs at a higher wattage?! Lol I was slightly confused here, maybe I am just having a moment:leaf:
 
SomeGuy

SomeGuy

Well-Known Member
HolyGhost23 said:
Yeah seems so.. Don't see many doing that
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That is because efficiency takes a huge hit running them that hard. VERO 29 would be a bit more efficient at higher current outputs. I even plan on dropping my output current some and increasing chip count on my current light bars.
 
HolyGhost23

HolyGhost23

Well-Known Member
Ever do the math to figure real world vs the numbers.....its like 2% different on your power bill.. And the chip will last at least 5 years if I make sure it stays cool..by that time something better will be out for sure..
 
SomeGuy

SomeGuy

Well-Known Member
HolyGhost23 said:
Ever do the math to figure real world vs the numbers.....its like 2% different on your power bill.. And the chip will last at least 5 years if I make sure it stays cool..by that time something better will be out for sure..
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Every bit helps and its a bit more than that in efficiency gains. Of course I don't really plan on replacing for a long while once I have things built to work the best in my system.
 
SomeGuy

SomeGuy

Well-Known Member
HolyGhost23 said:
I always change things.. I'm in it for experimentation .. If I get food results .. That's just a bonus..
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I have thought that being able to dim up to 2.1 amp might be a good feature. This way you could gradually introduce more light intensity during peak flower and then back it off again towards the end. I will say the LED buds are just as good if not better than buds I have produced under HID or Flouro.
 
SupraSPL

SupraSPL

Well-Known Member
Hey HG, glad you have the lamp at work good stuff! Yes you would get a slight efficiency boost if you swap in the Vero29 or even better the Vero29 version 2.0 that hopefully will be available soon. You could repurpose the CXAs at a lower current and get great performance from them too. The driver puts out about 2.23A, but tricky to match with the CXA3070 I had to work at it a bit to find COBs and drivers that matched in terms of voltage range. The Vero29 should pose no problem with these drivers because it has a slightly lower Vf. BUT, because of the lower Vf the COBs will dissipate slightly less.

http://www.ebay.com/itm/100W-Watt-High-Power-LED-Driver-AC90V-265V-50-60HZ-Waterproof-/181302171749

Here is what I come up with:

CXA3070 3K Z4 @ 2.23A = 89.2W -> 34.6% efficient (30.86 PAR W)
Vero29 3K @ 2.23A = 86.5W -> 36.2% efficient (31.3 PAR W)

So based on that looks like there would be no worthwhile advantage to swapping them.
 
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