Need help designing a DIY CREE set up

M

mr mike hunt

Member
Hi guys!

I have a 5' x 5' space that will be used for flowering. I am in need of a set up to light up the space.

I am interested in building my own CREE array to do the job.

Would you suggest that I use either the CXA3070, or the CXA3590 COB chips?
Basically, If someone could make up a shopping list for me, that would be best.

I was on the fence of buying two Rocket Plasma lights, then I came across all of the DIY lights here, and that made up mind.

I appreciate any help, thanks in advance.
 
medicinehuman

medicinehuman

Well-Known Member
mr mike hunt said:
Hi guys!

I have a 5' x 5' space that will be used for flowering. I am in need of a set up to light up the space.

I am interested in building my own CREE array to do the job.

Would you suggest that I use either the CXA3070, or the CXA3590 COB chips?
Basically, If someone could make up a shopping list for me, that would be best.

I was on the fence of buying two Rocket Plasma lights, then I came across all of the DIY lights here, and that made up mind.

I appreciate any help, thanks in advance.
Click to expand...
Then there's Alpine 11 heatsink's or Heatsinkusa, Egghead has the alpines cheap..
 
medicinehuman

medicinehuman

Well-Known Member
mr mike hunt said:
Thanks!

How many 3000K and how many 5000K chips for a 5x5?
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That depends on how hard you run them, 25sq. feet, I'd say at least 25watts per sq ft. @ 1400mA you would need about 12 cob's. I run mine at 700 and 1400 and 1050mA IN DIFFERENT closet type closures. 3000k for my bloom and 5000k for vegging( I VEG @ 800mA. SOMEONE ELSE can give you better options than me. If you can read all the DIY threads you'll see many other options. Good luck
 
M

mr mike hunt

Member
Thanks for the input. Yah, so many threads, so many options.

12 cobs, all 3000k, or would say three of the 5000k have a benefit?
 
Abiqua

Abiqua

Well-Known Member
mr mike hunt said:
When I see AB bin or Z4, or whatever, what does that mean? Something to do with the quality?
Click to expand...
The Cree 3070's are binned according to output in a particular color temp.

In this case the Z2, Z4 and AB bins are all in Cree Cxa3070 3000k diode range.
Each bin increases photon output/efficiency by about 7% over each lower bin. Z2 is the lowest, Z4 is higher and then AB which is the highest available bin....all in 3k.

SupraSPL, one of the guru's around here compiled this sheet, hope it helps....I urge you to download the datasheet for the CXA3070's. They can be dry no doubt, but full of pertinent info....:peace:
Efficiency.jpg
 
AquariusPanta

AquariusPanta

Well-Known Member
Abiqua said:
The Cree 3070's are binned according to output in a particular color temp.

In this case the Z2, Z4 and AB bins are all in Cree Cxa3070 3000k diode range.
Each bin increases photon output/efficiency by about 7% over each lower bin. Z2 is the lowest, Z4 is higher and then AB which is the highest available bin....all in 3k.

SupraSPL, one of the guru's around here compiled this sheet, hope it helps....I urge you to download the datasheet for the CXA3070's. They can be dry no doubt, but full of pertinent info....:peace:
View attachment 3337397
Click to expand...
Are you sure there isn't an updated compilation of data floating around the Vero thread? I have a hard time believing my Vero 18's are running ~36% @700mA... (:
 
Abiqua

Abiqua

Well-Known Member
AquariusPanta said:
Are you sure there isn't an updated compilation of data floating around the Vero thread? I have a hard time believing my Vero 18's are running ~36% @700mA... (:
Click to expand...
Yes, disregard theVero's.....I have an updated version of those....these past Vero #'s represent bare minimums as they aren't binned like Cree's....but the newest set has been updated to reflect a more ideal LER i thunk.....:)

The Cree's are correct and I need to update that sheet, thanks for heads up Aqua
 
SupraSPL

SupraSPL

Well-Known Member
Yes those figures are using the "minimum" figures rather than the typical. Also the Vero PDF was updated and the price has drooped. Then it got another price drop and apparently an effciiency increase is also on the way. Here are the updated numbers using the "typical" figures and efficiency/price numbers of the Veros currently available from Digikey.

Vero 10 13.png

Vero 18 29 2.png
 
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SupraSPL

SupraSPL

Well-Known Member
I use about 30 W/ft². Using that figure, if you run them at 1.4A, that would be 15-16 CXA3070s. If you run them at 1.05A, 18-20 would do the job. You could go with more if you want to maximize your space or you could go with less if you are working with a short canopy/sea of green etc. But 30-35W ft² is a good compromise IMO.
 
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