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Bridgelux EB Series Build

Discussion in 'LED and other Lighting' started by brahbbyB, Dec 5, 2016.

  1.  
    Randomblame

    Randomblame Well-Known Member

    Yepp, you can set a limit!
    The left poti is the voltage limiter. Set the voltage to 24v using the multimeter from the last picture.
    This 24v will be divided by 8 diodes in series, so the maximum one diode can get is 3v.
    A LM561c needs 3,05v at 200mA/50°C, this means, if the voltage is limited to 3v the maximum one diode can get is only around 190mA or 5% below it's maximum rating.
    Set 24vdc as max. voltage and you can be sure you run the strips not too high even if the current poti on the right side is set to 100%.
    Set the voltage limit to 23,5v and and the diodes are further limited and can just get only ~150mA max.
     
    Serva likes this.
  2.  
    Serva

    Serva Well-Known Member

    OK, think I didn‘t understand the question correctly...

    But, at which point do you set the current limiter or the voltage limiter? Because as he did now, I thought you need to set the current limiter to 9,9A, instead of the full 10A, which could be too much. So what‘s the advantage in limiting the voltage?
     
  3.  
    Randomblame

    Randomblame Well-Known Member

    All this on the condition that the strips are cooled properly. If you operate them at their limit, additional c-channels are required and some air movement would also not hurt...
     
  4.  
    Randomblame

    Randomblame Well-Known Member

    The advantage of setting a voltage limit is for instance you can avoid thermal runaways if one strip has a slightly different voltage.
    The voltage limit limits the strips from getting too much current.
    With this 24v limit you could even set 15A current(300mA per diode) and the strips would not take it, they would be still limited below 200mA per diode. At 300mA for example a diode would need ~3,3v but the voltage limit avoids that and allows only 3v per diode.

    It's a bit complicated, but the voltage does not just depend on the current, but also vice versa. Higher voltage allows more current and if the voltage is limited, the current is limited also.
     
    graying.geek, Serva and projectinfo like this.
  5.  
    projectinfo

    projectinfo Well-Known Member

    Ah one thing I see above too was about series. I'm in parallel does that matter, for adjusting.

    The strips are on with RTV high temp silicone. Should I just get more strips?
    Sounds like it's going to get too hot to run


    Update. May need to get a little terminal block for testing. These wago don't work for testing.

    I managed to get a reading 14v then it just goes to 0

    Just testing the brown
    /blue out of the driver
     
    Last edited: Dec 6, 2017
  6.  
    Serva

    Serva Well-Known Member

    Wago‘s have a testing spot, where you can put the multimeter into. I can also put it directly into the wago and close it, so it‘s stucked. Don‘t know why it‘s not working for you!
     
    projectinfo likes this.
  7.  
    projectinfo

    projectinfo Well-Known Member


    OK IL try again when I get home thanks for that,

    It was said to limit the voltage to 24v for 8 strips.

    https://ca.mouser.com/Search/m_ProductDetail.aspx?r=709-HLG240H-24A

    My driver is 24v so do I just turn it up to max voltage. And adjust current so the strips are 1.4a x 8 strips ?
     
  8.  
    projectinfo

    projectinfo Well-Known Member

    DSC_0483.JPG

    When I test it goes from 14 to 0in a second
     
  9.  
    Serva

    Serva Well-Known Member

    With 8 strips you don‘t need to limit anything, if I remeber the post from yesterday correctly. I think I calculated 7,2 or something, so 7 strips too less, but 8 are fine. That‘s why I said it‘s the easiest/best way, if you have the strips anyways!
     
  10.  
    projectinfo

    projectinfo Well-Known Member

    OH awesome!!!

    So I'm good to turn the two screws on the driver all the way up with 8 strips..??? Just to be sure. Haha

    It's all starting to make sense thanks again man
     
  11.  
    1212ham

    1212ham Active Member

    The meter is set to AC voltage. I think you are tying to measure DC?
     
    projectinfo likes this.
  12.  
    projectinfo

    projectinfo Well-Known Member

    Behold. 2x4 table 480w
    60w per Sq ft

    . Starting the lights at 16 inches.

    Full power
     

    Attached Files:

    chinakush likes this.
  13.  
    projectinfo

    projectinfo Well-Known Member

    I had to press the select button to go from ac to DC on that setting

    OK so the meter is reading over 24 is that OK? DSC_0488.JPG


    I turned both drivers down to just below 24v
     
    Last edited: Dec 6, 2017
    Randomblame likes this.
  14.  
    Serva

    Serva Well-Known Member

    Randomblame likes this.
  15.  
    projectinfo

    projectinfo Well-Known Member

    Might be smart to dial these back to 50w/sq ft.... For heat. And so I don't cook my girls

    I only used RTV silicone to put the strips on the aluminum.. Nfhiggs said it was cool.


    Anyone know how I would figure out what to drop the voltage to...... To get from 60w/sqft to 50w/sqft
     
  16.  
    projectinfo

    projectinfo Well-Known Member

    Great so I'm well within the limit of 1400mah. Should be fine to run full blast but it might be a bit overkill for the space you think??
     
    Randomblame likes this.
  17.  
    Serva

    Serva Well-Known Member

    I didn‘t voice this opinion, but you were reading my thoughts! I am fine with 30-35 w/sqft, above that I get unhealthy plants in my enviroment / with my feeding.
     
    projectinfo likes this.
  18.  
    projectinfo

    projectinfo Well-Known Member

    Wow really eh. So I'd be fine with almost half power. Like A series driver full dim? (50%)

    And how close do you put your lights to your canopy man. I was thinking about 4 inches
     
  19.  
    BuddyColas

    BuddyColas Well-Known Member

    I run 30-35w a sq/ft, 4" between strips and 4" off the canopy. Works good. Very uniform blanket a photons.
     
    Randomblame and Chip Green like this.
  20.  
    projectinfo

    projectinfo Well-Known Member

    15126011595948239207666761933910.jpg

    Nice, well this is 60w/sq ft on full blast.

    I checked voltage, it dims to 20v, max at 24.46

    how do I tell my watts/sq. ft now I know my volts

    Should I just leave it fully dimmed?
     
    Last edited: Dec 6, 2017

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