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More Chips less power?

Discussion in 'LED and other Lighting' started by AlexHarryy, Dec 4, 2017.

  1.  
    Randomblame

    Randomblame Well-Known Member


    Oh je, I overlooked that B....again!
    Knock, knock!...McFlyyyyy?!?
    A version should work with voltage poti turned fully open(53v).
    It's the second time you got me with that B, Lol!
     
    Isawthelight likes this.
  2.  
    CobKits

    CobKits Well-Known Member Rollitup Advertiser

    Thats why i stock 48A and 54B because both are good up to 53-54V
     
    Randomblame likes this.
  3.  
    CobKits

    CobKits Well-Known Member Rollitup Advertiser

    AlexHarryy likes this.
  4.  
    AlexHarryy

    AlexHarryy Member

    Great post, specially this sentence :)
    So just to be sure, for the constant voltage I just see how much amps is the output and divide them by the cobs quantaty, and thats it.
    Thanks man, that was well explained :)
     
  5.  
    CobKits

    CobKits Well-Known Member Rollitup Advertiser

    if you are in the range of cob operating current and voltage, yes (cases A and B)
     
    AlexHarryy likes this.
  6.  
    AlexHarryy

    AlexHarryy Member

  7.  
    AlexHarryy

    AlexHarryy Member

    Okei i see now, min 31.2V max 36.8 , but this confuses me even more, i thought i got it :D
     
  8.  
    Randomblame

    Randomblame Well-Known Member

    The 1216 works within this currents and voltages. It take 38v at ~3Amps for instance or 34v at ~1Amp. Screenshot_20171207-124007.png

    The second screenie shows the voltage droop at different temps. At 1,440A it needs [email protected]°C but only 34v @75°C.

    Screenshot_20171207-124452.png


    At 36v and 25°Tc. each COB would need ~1,8Amps(when switched on) and @75°C up-to 2,2A(warmed up), so at least 6 COB's in parallel should work, better a few more.
     
    Heil Tweetler and AlexHarryy like this.
  9.  
    Randomblame

    Randomblame Well-Known Member


    Lol! It is confusing ... sometimes!
     
    AlexHarryy likes this.
  10.  
    Dave455

    Dave455 Well-Known Member

    So what is best current to run cxm 22 for efficiency ?
     
  11.  
    CobKits

    CobKits Well-Known Member Rollitup Advertiser

    100 mA if you can afford it
     
    Randomblame, AlexHarryy and Nutria like this.
  12.  
    AlexHarryy

    AlexHarryy Member

    So i even can put 12 pieces? And it will be 6.7 amps/12 = 0.56 amps per cob?
     
  13.  
    Randomblame

    Randomblame Well-Known Member

    Yepp, but the lower the amperage(the more COB's) the lower the voltage, like you can see in the 1st screenie above. At 560mA only around 33v. But effiency increase!
     
    Heil Tweetler and AlexHarryy like this.
  14.  
    AlexHarryy

    AlexHarryy Member

    Output VOLTAGE ADJ. RANGE 43-52V of the driver HLG-320H-48B. Does it mean that 1216 does not fit?
     
  15.  
    Randomblame

    Randomblame Well-Known Member

    Adj. voltage is only enabled on the A version. B version is 48v fixed(no voltage poti)!

    You can still use is but only at or below 48v were the A version is adjustable to work with up-to 53v. There is a small "note 6)" or so, it means only A and C versions coming with adjustable Vf.
    Read the datasheet carefully and make sure you understand every single part. I know, it needs some further infomations but it's worth it.
     
  16.  
    AlexHarryy

    AlexHarryy Member

    But am I okey with HLG-320H-48B? More cobs i add less heat they produce and run on less V, right?
     
    Last edited: Dec 7, 2017
    Randomblame likes this.
  17.  
    Randomblame

    Randomblame Well-Known Member


    Yepp, but you would still not use the full potential of the driver. But you could use Samsung F-Series strips, the 4ft. strips as well as the double row 2ft. strips work with 46-48v and would fit much better. 6 strips in parallel would be ~310w with ~170lm/w. But with 12 COB's(33v) it would be only around 225w.
    6 of these strips would cost you 150$, but you need no heatsink, only a 4ft piece of 1x 1x 1" c-channel(walmart). Would be cheaper as 12 COB's + heatsinks and you can use the drivers full potential.
     
    AlexHarryy likes this.
  18.  
    AlexHarryy

    AlexHarryy Member

    That sounds good, i will do exacly like that! Thanks a lot dude!
     
    Randomblame likes this.
  19.  
    Randomblame

    Randomblame Well-Known Member

    This strips works extremely well, lots of us here use them. I've also purchased 26 2ft. strips for short!
    You can get them from digikey.com and also from arrow.com with free shipping. They use the same diodes like Quantumboards(LM561c, top bin) and it is super easy to work with them. No soldering, no holders, no thermal grease, only a few screws or double sided thermal tape(e3ay).
     
    AlexHarryy likes this.
  20.  
    CobKits

    CobKits Well-Known Member Rollitup Advertiser

    yes usually constant current region is 50-100% of Vo. voltage is not adjustable thought and its up to YOU to build an array that can take what the driver gives it, basically making sure it stays at a fixed safe point on the driver operating curve
     
    Randomblame likes this.

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