Introducing CobKits.com - specializing in DIY and Citizen COBs

Discussion in 'LED and other Lighting' started by CobKits, Aug 2, 2016.

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  1.  
    cosmonautking

    cosmonautking New Member

    im sorry cobkits for making 2.8 trillion purchases (im an impulsive buyer) and had to make up for the original impulse i luckily succumbed to. youve made one happy and long term customer
    i love that you accept ltc, and with the extremely low fee, and still at a very volatile stage in its own life. its good for both of us, and i really think that THIS is what will especially make you stand out for the foreseeable future
    curious if you know any other marketplaces with the same style of business layout as you do? mostly with the accepting ltc. but for horticulture supplies?
    iv recently steered away from btc transactions because of the fee, so those are out of the window. and i would really rather my money go to someone like you, whom it would properly benefit
     
    key4 and pop22 like this.
  2.  
    CobKits

    CobKits Well-Known Member Rollitup Advertiser

    hey @cosmonautking check your email i have a question about your order
     
    pop22 likes this.
  3.  
    chuckie86

    chuckie86 Well-Known Member

    That sux I wanted to put a order in for a bunch in a few weeks where can I get the 120mm at $23-$$24 is alot when buying 16 at a time plus all the other shit I use last order I got 16 of everything cost like $750
     
  4.  
    Dave455

    Dave455 Well-Known Member

    Rapidled has 140mm for $ 19 ??
     
  5.  
    KonopCh

    KonopCh Well-Known Member

    216V * 1.28A = 276W...
    But... 280W-276W = 4W... That is not 7% from 93% efficient driver.

    Also another question... If I add another light on that driver (shows 280W MAX) to fully load it with V... it will be 280W or even more? Or better ask, driver shows 280W even if it's 90% full or 70% full?
     
  6.  
    guy_incognito251

    guy_incognito251 Active Member

    If your running six gen 6 citizen 1212 cobs then the forward voltage of each would be close to 35V at 1.28A (assuming a cob case temperature of 50c - the voltage would be lower at higher temps), also the output of the driver may be less than 1.28A when the pot is turned all the way up (there will be some variation between drivers) - the only way to be sure would be to measure it.

    So 280W from the wall is about what you would expect. The power input to the driver is related to the output load so it wouldn't draw 280W if it was only 70% loaded.
     
  7.  
    KonopCh

    KonopCh Well-Known Member

    That's something strange... I have 220W COBs and KAW shows 280W.
    Guys here write about 300-500W COBs... and KAW showing only 20-30W more.
    Mine shows 60W more.
     
  8.  
    CobKits

    CobKits Well-Known Member Rollitup Advertiser

    based on an actual voltage measurement?
     
  9.  
    CobKits

    CobKits Well-Known Member Rollitup Advertiser

    sorry i havent been around guys, jsut getting over a stomach bug that had me out for a few days. Focusing on getting orders out

    **heads up im travelling from 1/10-1/15 so if you need something get the order in today (tues) if you want it to ship before i leave. next shipping day after that is monday 1/15**
     
  10.  
    KonopCh

    KonopCh Well-Known Member

    Based on Citi gen 5 calculator. Heatsink run under 30°C. 6x1212 COBs = 37W * 6 = 222W.
     
  11.  
    HydroRed

    HydroRed Well-Known Member

    Is there a coupon code? The RIU doesnt work?
     
    topcat likes this.
  12.  
    CobKits

    CobKits Well-Known Member Rollitup Advertiser

    thats not going to get you very close as you dont know case temp or junction temp nor actual current. jsut measure voltage and current and you'll know right away
     
  13.  
    CobKits

    CobKits Well-Known Member Rollitup Advertiser

    not since 12/31

    mixed feelings about reviving it

    i think im going to change up price structure soon, drop prices across board, and give automatic discounts on qty purchases
     
    pop22 likes this.
  14.  
    KonopCh

    KonopCh Well-Known Member

    Still 6x1212 cannot be 250W or 280W.
     
  15.  
    nxsov180db

    nxsov180db Well-Known Member

    Why not?
     
  16.  
    KonopCh

    KonopCh Well-Known Member

    Look my first post.
    1050mA driver.
     
  17.  
    nxsov180db

    nxsov180db Well-Known Member

    It's a 240 watt driver, It'll run more than that when turned all the way up they always do. I have 13x 320's and some of them run over 380 watts..
     
  18.  
    KonopCh

    KonopCh Well-Known Member

    But I didn't take full driver, there's place for another 25-30V I think. I think it's quite a bit number --> 60W difference, as driver should be 93% efficient.
     
  19.  
    nxsov180db

    nxsov180db Well-Known Member

    I believe the driver will run at the full wattage even if you are not using the maximum voltage output. I have an unknown brand driver I re-purposed that used to drive a single COB at 30 volts and drew around 210 watts, I now have it driving led strips at its max output of 46.5 volts and it still has the same watt pull.
     
    Last edited: Jan 10, 2018
  20.  
    KonopCh

    KonopCh Well-Known Member

    That was I thinking, but guy on this page said it's not possible. See little above.
     

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