DiY LED Grow Lights with CREE CXA3070 COBs and CPU Coolers

Discussion in 'Do It Yourself' started by Gaius, Mar 1, 2014.


    Gaius Active Member

    Easily build your own high-power LED Grow Light using COBs!

    (Built with assistance of RIU contributors! - Original thread )

    Battlestar Ganjatica - A 480 Watt Multi-Mode LED Grow Light

    6x CREE CXA3070 @ 3000K - $36ea ($216)

    2x CREE CXA3070 @ 5000K - $38ea ($76)

    8X Meanwell LPC-60-1400 Drivers - $20ea ($160)

    8 Arctic Cool CPU Coolers - $9ea ($72)

    Rhino 12v External HDD Power supply - $9 (for powering fans)

    1 Tube Thermal Adhesive
    - $8

    3'x1' White Shelving board - $10

    4x Bottom Sliders for Drawers - $7ea ($28)

    (link is not exact model. I only paid $7 each in-store)

    3x 2-way Switches - $4ea ($12)

    4 heavy-duty stainless eye bolts - $1ea ($4)

    10 Pack In-sure easy wire connectors - $2

    6-Pack Blue Mid-line connectors - $2


    MISC Other Materials:

    Ignore the fan-speed controller. Didn't end up using it.


    Wiring is pretty basic. Just scale up the below diagram (provided by RIU member Goud)



    And here you go!


    3 Modes: Veg, Teen, Bloom


    Preliminary Results look good!

    First day over plants:

    Week or so later:


    budbro18 Well-Known Member

    Thats a nice set up!!! How was the yield with it? And whats the wattage of those cobs compared to what youre running them at??

    Gaius Active Member

    CXA3070 Spec Sheet

    I run mine with 1400mA CC drivers

    I took Goud's expert advise:

    I will post yield after the final cut. The current grow still has 3-5 weeks left. Unfortunately this round is not a good benchmark, since the plants were started under a pre-made panel and had 2 weeks early-bloom assistance from 400 watt of T5HO. The last 2 photos in the post show the difference only about a week made in bud growth though!

    madininagyal Well-Known Member

    i'm looking forward will you start from clone next time?

    budbro18 Well-Known Member

    Looks good either way. are there lenses on the lights as well?? The LEDs i use dont have any. They use epistar or bridgelux LED cobs so not tip top of the line but a good quality none the less.

    Gaius Active Member

    Yeah I have a lovely bubba kush momma in my veggie bin for the next round.

    No lenses, as they just diminish the output of the COB. Reflectors can help, but I like the default spread just as it is.

    I will be adding 6 deep-red Luxeon LEDs on individual flexible arms soon, and these will mount on the Battlestar for bud-targeting.

    PetFlora Well-Known Member

    About time lol

    Got lots of pop corn, beer, and weeeeeeeeeeeeeeeeed

    If the info I just came across is accurate, make room for 1-2 10K+ cobs

    I just read that 10K during flush amps up tric production.

    I am within a few days of harvesting 2 sweet WH x WW pollinated with BGum under my 432w hot5. Same strain but small pheno grown under my leds is drying now.

    On that advice. I just replaced 3 hot5 tubes with 6500s (his fall back position)
    tekdc911 likes this.

    wyteberrywidow Global

    Very nice!!! Congrats on the build.

    churchhaze Well-Known Member

    This picture makes it look like you built an airship. Nice.

    Can you program the fans to keep it in a stable hover? You could ditch the cables.


    Dr.D81 Well-Known Member

    good build looking to go led in my veg this spring
    Mainlinekush likes this.

    bbspills Well-Known Member

    I think you can lower your light even more for some bitchin penetration. Grab a lux meter and shoot for 100,000 lux at the canopy
    fearnoevil and potpimp like this.

    Gaius Active Member

    Yep figured that out pretty quickly. It's now about 12-16" above canopy.
    potpimp likes this.

    budbro18 Well-Known Member

    figured just didnt knwo if the pictures were hiding some of the lenses.

    I like the lack of lenses on my panels as well. You should be able to get them within a few inches of your plants give or take. I just had my first burn problem when my plant ran into the light because of the flower stretch. haha

    cbrill Member

    You would need such high powered fans to keep it up it would damage the canopies probably. :P

    cc2012 Well-Known Member

    Anymore updated Pics or Reports on Grow with these, Any issues you have noticed? Temps of GR, around ladies and such.

    Quick Question: Them COBS are they 60w each?

    That's some Mad Skills Gaius..


    Gaius Active Member

    Temps stays around 70-75 in the upstairs closet when it's 80degrees outside...

    ...So working well!

    Update pic


    New close-up photos in the bud-porn thread in my sig.

    cc2012 Well-Known Member

    Nice! would love to build one "BATTLESTAR GANJATICA" bit out of my price range at the moment...

    So the 480w is like 8 x 60w...might look into the 30w version and price up the components for a slightly smaller(PWR) build.

    Great build...n looking sweet!


    Banana444 Well-Known Member

    Thats amazing. These cree cxa3070 are the biggest and baddest led chips right now, right? Did a little reading and something like 138 lumen per watt.

    Mellodrama Well-Known Member

    The CXA3070's are pretty much the most powerful/efficient COB's that the retail shopper can get their hands on. But the highest bins are often unavailable. I just bought a couple of 5000K CXA3070's. Had to settle for the CXA3070-0000-000N00Z450F because nobody's offering the higher bins. Not to the person who wants to buy 2 or 3 of them.

    You have to be careful about lm/watt. They're more efficient when they're not being driven hard. You can get more light out of the device by driving it harder, but you're losing efficiency as you crank up the amperage. So it's a story of diminishing returns.
    hillbill, SupraSPL and PetFlora like this.

    foreverflyhi Well-Known Member

    Wow... Im speechless, this is awesome!!
    SupraSPL likes this.

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