Another Cree CXB3590 DIY thread

littlejacob

littlejacob

Well-Known Member
PerroVerde said:
Parts are:

9-CXB3590 CD 36v 3500k's
9-800ma drivers
3-32" x 3.5" heatsinks

That's one COB per sq/ft and these are the numbers that Supra gave me that convinced me to do this build.

9 CXBs at .8A (26.5W) 62.3% efficient in a 3X3 = 14.9 PAR W/ft² or 740 PPFDaveraged, 90W heat

From the first post... :)
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Bonjour
could you please tell me what kind of driver and the price...
Is it dimmable drivers?
And is it passive or active...I believe it is passive regarding the size of the hs and the mA!
Good grow to you
Have a great day ★
 
captainmorgan

captainmorgan

Well-Known Member
As I said on the first page of this thread I bought these drivers slightly used from a member here and I don't have any info on them other than what I said. If he wants to add any further info he can post it.
 
captainmorgan

captainmorgan

Well-Known Member
Spent some time today playing with things in the 3590 tent. Passive cooling is doing well and the highest reading I could get was just over 100 f on the back side of the heatsink directly behind the COB. I have a 6" clip fan in the tent but not pointing at the light and I have a inline fan exchanging air in the tent,in on the bottom and out at the top. At 12" I get a reading of around 600 umoles and it's very consistent over the entire canopy,I'll move it down as flower advances but I'm not sure if I'll go much over 800 umoles.
 

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ttystikk

ttystikk

Well-Known Member
captainmorgan said:
Was talking with Supra tonight and I'm getting ready to build another one of these but I'm going to try a 4.230" heatsink instead of the 3.5". Not sure it will be worth the extra $30 but we'll see.
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You're paying a premium for that extra efficiency, double the chip and holder costs- and drivers too, since they're singles? Since you're doing it again, clearly you feel it's well worth it. Can you walk me through your logic? The WHY of people's choices is always fascinating to me!
 
captainmorgan

captainmorgan

Well-Known Member
I'm getting huge numbers from my Z4 cxa3070's at 40% efficiency and 529 PPFD. I looked at the price of the 3590's and actually got them cheaper than my 3070's when I bought them. I also wanted to go passive so I wouldn't have to worry about a fan or fan PSU failure. I was looking at having a more even light distrabution and was thinking one COB per sq/ft. To my amazement the 3590 at 700 too 800 ma fit all my wishlist points and even gave me more PPFD at 740 than the 3070's but also used less electricity. And the Cherry on the top was about 64% efficiency which means this light won't need a upgrade for a very long time I think.
I left out that single drivers means that even if one goes out it won't impact the grow much until I can switch it out and the drivers I'm using are 90-91% efficient.
 
ttystikk

ttystikk

Well-Known Member
captainmorgan said:
I'm getting huge numbers from my Z4 cxa3070's at 40% efficiency and 529 PPFD. I looked at the price of the 3590's and actually got them cheaper than my 3070's when I bought them. I also wanted to go passive so I wouldn't have to worry about a fan or fan PSU failure. I was looking at having a more even light distrabution and was thinking one COB per sq/ft. To my amazement the 3590 at 700 too 800 ma fit all my wishlist points and even gave me more PPFD at 740 than the 3070's but also used less electricity. And the Cherry on the top was about 64% efficiency which means this light won't need a upgrade for a very long time I think.
I left out that single drivers means that even if one goes out it won't impact the grow much until I can switch it out and the drivers I'm using are 90-91% efficient.
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Me like. Can't wait to see what you pull under them!
 
lilroach

lilroach

Well-Known Member
I just built a trial COB set-up...it's too ugly to show, but it was my intent to learn about this type of lighting by getting my hands dirty and mostly winging it.

I know nothing about BIN's and other LED specific lingo....All those acronyms hurt my head. I read most of this stuff and my eyes glaze over.

I'm a computer tech and have tons of computer crap laying around including piles of power supplies and CPU heat sinks. I went with CXA 3050 mostly due to the price....It seemed to produce the right wavelengths and if I was going to screw up a COB....it might as well be a cheap one.

I'm lighting four of these using a 500w PC power supply and DC power boosters...one for each cob....I have them running at 35 volts and all I know is that they're bright as shit.

Everything seems to be working as anticipated and now have two plants starting their 12/12 under this set-up. They haven't died.....so I guess that's a good sign.

I've re-ordered eight more of the CXA's based on my 6 days of experience with the trial set-up. I've gutted a 6 bulb T5 fixture and plan on using it for the new light. I'll be using the 4.2ish (it's just over 4") heatsinks and 70mm low profile CPU fans. I'll be using the PC power supplies....maybe one for each two cobs....why....I don't know. They will be driving the boosters as I am in the first light.

I'm telling you all this to ask your opinion of what I've done right and what I've done wrong....so far. Don't spare my feelings, I wouldn't ask if I was sure I know what the hell I'm doing. Please spare me as many acronyms and math as much as possible.

P.S. My focus has not been about efficiency as it seems both you and Supra are driven to get the best efficiency possible...considering I've been running four 600w HPS the past few years, anything would be more efficient than that. What I'm looking to do is effectively replace my 600's with COB LED's....any savings is secondary....I just want the same yield and quality from LED's.
 
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