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DiY LEDs - How to Power Them

Discussion in 'LED and other Lighting' started by SupraSPL, Feb 22, 2014.

  1.  
    Isawthelight

    Isawthelight Active Member

    Should be no problem running 80 watts of LEDs on a driver that can put out 100 watts. The driver will supply the same current at 80 watts load & 100 watt load, but the driver's output voltage will be lower at 80w and higher at 100w.
     
  2.  
    swiftkillpapa

    swiftkillpapa Well-Known Member

    So on the other note you think cobs would be the better choice even for a really tight low pro set up? Like say the clu038 1212. Some British supply sells them at ~$50 for 5.
     
  3.  
    klx

    klx Well-Known Member

    Some manufacturers actually recommend that you use up to 80% of the voltage of a driver. Of course many people here push their drivers to 100% as a way of saving money but if you are using 80% then you are in the sweet spot.
     
  4.  
    TF9

    TF9 New Member

    CLU048 maximum power is 117.5 watt per cob so i don' t think you'll have to worry about that.
     
  5.  
    swiftkillpapa

    swiftkillpapa Well-Known Member

    Yeah but can i wow they in series with xpg that are 5 watts?
     
  6.  
    GBAUTO

    GBAUTO Well-Known Member

    When wired in series all of the diodes see the same amount of current flow so if you are using smaller discreet diodes with cob's make sure that both will operate at the current level. Usually the smaller diodes operate at a lower forward current but check the specs.
     
  7.  
    xKenya

    xKenya New Member

    @GBAUTO Thank you for the reply to my post/questions! I think that was the last assurance-check I needed and I submitted a few preliminary orders to source out some materials for my build. Hopefully I can report back in with success :D

    @TF9 I have begun sourcing the materials and I should have them all delivered over the next few weeks. I'm hoping to complete the build within the next month and I'll do my best to take some pictures of the process.
     
    pop22 likes this.
  8.  
    pop22

    pop22 Well-Known Member

    Most meanwell drivers are both constant current and constant voltage, so no, you don't have to drive the driver to its max. Read the data sheet, it tell you the minimum voltage that it will run as some drivers won't run a single cob

     
  9.  
    pop22

    pop22 Well-Known Member

    if you need super low profile, you should look into Quantum boards. about 2 inches thick WITH the heatsink! Its basically a cob on a larger platform, better spread, and great specs. I just built a 4 board light:

    Qautum-4 pic1 -3-9-2017.jpg


     
    coreywebster likes this.
  10.  
    swiftkillpapa

    swiftkillpapa Well-Known Member

    Very nice. What's its coverage?
     
    pop22 likes this.
  11.  
    Castel

    Castel Member

    I have 4x CXB-3590s in series on an HLG-185H-C1400B driver. This morning I noticed that the light was much dimmer than it should be. Looking at the LEDs I saw that one of them had exploded.

    Considering that Meanwell drivers are constant current/constant voltage, is it safe to remove the malfunctioning LED and just run the remaining 3 LEDs on this driver? What effect will it have? Will they be running at a higher wattage? Just worried about overheating in that case.
     
    pop22 likes this.
  12.  
    klx

    klx Well-Known Member

    That is a constant current driver so yes you can just remove it and run 3 as long as you are within the fV range listed on the driver. I would be looking into why that COB exploded before I did anything though tbh.
     
    pop22 and Castel like this.
  13.  
    Castel

    Castel Member

    Thanks. All I can find is that the max output is 143v. Cannot find a minimum. However, this is apparently a constant current/constant voltage driver, so does that mean the output is always 200w @ 143v? Would that mean that instead driving 4 COBs at ~50w each, it would drive 3 COBs at ~66w each? I believe my heatsinks are rated for about 65w. I could use the dimmer to lower the current however.

    Also, pretty hard to say why the COB failed. I would say that either it was faulty, or more likely I may have over tightened the fastener, or not had good contact with the thermal tape/heatsink.
     
    Last edited: Mar 11, 2017
  14.  
    coreywebster

    coreywebster Well-Known Member

    The voltage range on that driver is 71v-143v http://www.mouser.com/ds/2/260/HLG-185H-C-SPEC-806161.pdf

    It doesn't share the wattage the way you thought, its constant current so it runs each COB at 1400mA, so if you have 4 cobs it will run them at that current and have a wattage of 195w and have a fv of 140, it will run at 205.26w at the wall due to drivers not been 100% efficient.
    Running 3 will just reduce the wattage and forward voltage, 147w on the cobs (154.74w at the wall) and fv of 105. The driver doesn't need to use all the power it can, it has to run within the forward voltage and not over the wattage of the driver.
     
    Rider509, Kempo and Castel like this.
  15.  
    Castel

    Castel Member

    Brilliant. Thank you!
     
  16.  
    coreywebster

    coreywebster Well-Known Member

    BTW I don't think it would be a good idea to leave your light with a dead chip in series still connected. You would be better to unsolder it and reconnect the wires. If there was a break in the circuit then none of the cobs would light up so its obviously conducting electricity but if its damaged who knows how long it will stay that way.
     
  17.  
    Castel

    Castel Member

    Right of course. I've already removed it and replaced it with another COB. I'm building another fixture but only have 3 COBs left at the moment so wanted to make sure it would be safe to run only 3 on my driver temporarily. Actually, I was surprised it was actually still emitting some light and not breaking the circuit. Cheers.
     
    coreywebster likes this.
  18.  
    Ariesstoner91

    Ariesstoner91 New Member

    Hello everyone I'm new to the forums and wanted some insight with my build plan I have two spaces one 8x8 flower room and 8x6 veg room
    I have 11 foot ceiling. Using cxb3590 20 4K cobs and 5 5k cobs and for the flower room 20 3k cobs and 10 3500k cobs. I'm in need of help choosing between mean well 320-2100 or 240-1400 drivers. Any help would be great and if anyone knows if with setup I can maybe get 60% efficiency? Can I run five cobs on either driver?
     
  19.  
    coreywebster

    coreywebster Well-Known Member

    The efficiency will come down to how hard you run them, @ 2100mA they will be around 49% and @ 1400mA 56%, those figures are from the cob calculator and there is some debate on how accurate they are. I will have to look at the driver specs to work out which fits best. But I'm about to go out. You can google the specs for each driver and look at the ranges. Download the diy cob calc from the thread on here and run the numbers to tell you the forward voltages, power consumption and efficiency and then cross reference them to the meanwell pdfs to see how many of each would fit best. The main thing is running the right amount of cobs so the forward voltage and power consumption fit best into the driver specs.
     
  20.  
    sixstring2112

    sixstring2112 Well-Known Member

    @CobKits will a meanwell 240-1750ma power 4 x 1212 shitizen in series ? rated volts is 143v.i know it works fine with 4 x cree but i see peope give slightly dif volages for citi 1212 ?
     

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