King Cob Led grow light

Discussion in 'LED and other Lighting' started by VegasWinner, Dec 1, 2017.


    VegasWinner Well-Known Member

    Check out this new light. give you any ideas yet?
    Not the greatest specs but a nice build style to consider for modular design.

    Power input: 85V-265V AC

    LED Quantity: 72x Ultra-Efficiency COB (Chip on Board) Diodes

    Chip Wattage: ~6w per diode

    Spectrum: 3000K

    Power Consumption: 480W

    Lens Angle: 60°

    Full Aluminum Housing

    Dimension: 35in (L) x 35in (W) x 4in (H) (90x 90x 11cm)

    Waterproof: IP65 (water resistant in humid, indoor growing environments- not water-proof [i.e. not to be submerged in water])

    verticalgrow Well-Known Member

    :leaf::leaf::leaf: Quantum with mirror finish :leaf::leaf::leaf:

    Last edited: Dec 1, 2017
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    Randomblame Well-Known Member

    Do you think this part of the end credits is an allusion ...?

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    Colo MMJ

    Colo MMJ Well-Known Member

    How much? Will it match a 1000 watt SE HPS? Thanks.

    legalcanada Well-Known Member

    they don't list what types of diodes used or light output which is concerning for me. they are probably the lowest bin cheapest cobs they could get from china. you can get cree cxas for under 2$ each right now . i can't imagine this light cost more than $300 to manufacture.

    legalcanada Well-Known Member

    it's $999 at growace and i highly doubt it could replace 1000w hps as it's only 480w of unknown efficiency. i don't think 480w of top bin crees or samsung diodes could replace a 1000w HPS even.

    with 72 points of light spread out like that though it should provide good coverage and penetration but i imagine if it had strong light output they would advertise PAR ratings and lumens etc
    Colo MMJ

    Colo MMJ Well-Known Member

    Nice looking fixture. How much? The music in the video sucks big time.
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    Colo MMJ

    Colo MMJ Well-Known Member

    Looks like 4 QB boards are in my future.
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    legalcanada Well-Known Member

    i think HLG is intentionally keeping low stock of DIY components to try upselling their prebuilt fixtures or something, they can't seem to stay in stock or restock. their chinese manufacturer produces their own PCB boards with the same diodes. not sure how much they are or shipping/customs but i imagine it'd be around the same or cheaper.
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    Colo MMJ

    Colo MMJ Well-Known Member

    I kind of do not blame them. They have a guy in Austin,Texas who is reselling their kits for them He charges about $25-49 to screw them together and connect the wires.

    $674 unassembled. The young guy in Texas and HLG always follow up quickly via email.
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    key4 Well-Known Member

    I agree its stock manipulation ,put the boards where the profit is ....Thats just business tho.

    This boards your on about? Below is from jeff. Ill be asking for a bulk order if the sample is good.

    "pcb size:305*355mm,336led on the pcb board.

    voltage are 68v,the max current are 2800ma.

    35usd/pcs,No MOQ request,if you have any interest,please contact me."

    legalcanada Well-Known Member

    yes i believe that is the one, i think the company was called HS(?) i only heard about it second hand in a thread on this forum but i believe 2.8a was the max current and the price is same. that's crazy i'm running my QBs at 1400ma and they get pretty hot already. i wonder why their max current is double what HLG recommends.

    with the rate LED tech is advancing and the dropping prices i really don't care to get more than 2 or 3 years out of my lamp so underdriving seems pointless to me. probably end up replacing it before it burns out anyways lol

    Randomblame Well-Known Member

    They take no messurements, they simply take the max. current and voltage values of one diode and multiply that by the number of LED's and parallel strings(24 diodes in series, 14 parallel in this case).
    You need a heatsink above 100w's and probably an additional fan to keep the boards cool above 150w.
    BTW, same goes for the voltage...
    At 2,8A such a board(24s14p) would need 72,3v at 85°C(3,01v) and 73,2v at 50°C(3,05v).
    At 1000-1100mA the voltage would be around 68v(2,83v).

    Nutria Well-Known Member

    Do you think that a led pcb like a qb with 300 diodes does not need an heatsink if driven low? Like 100w or less

    Randomblame Well-Known Member

    Yepp, but depends on ambient temps and airflow in your room! A slight but constant breeze helps a lot to keep the boards cool. You could also glue some c-channels directly to the backside of the boards to increase its cooling capabillities. This works well and makes the boards more stable at the same time. Simply take a 1" alu c-channel(walmart), cut it to length of the board and use some cheap e3ay thermal glue(1$/10g) to attach them to the boards.
    6 pieces á 355mm would add 12 fins and double the existing cooling surface.
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    key4 Well-Known Member

    Heres the company details.
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    Randomblame Well-Known Member

    I imagine 6 so prepared boards and a HLG-480H-C3500B(2S3P) to drive the boards at 80w each in a 4x 4' tent .... or with a HLG-600 even for a 5x 5'. No heat sinks required, only c-channels on the boards back side and a frame to attach and hang them. 80 to 100w per board is probably the sweet spot for these boards..

    CobKits Well-Known Member Rollitup Advertiser

    how much for the extra cleavage option?
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    Moflow Well-Known Member


    captainmorgan Well-Known Member

    They must of just forgot to mention which manufacturer makes the LEDs, honest mistake lol.

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