Assistance needed on LED unit

Discussion in 'Anything DIY Related' started by Jonathan Radloff, 6 Aug 2014.

  1. Jonathan Radloff

    Jonathan Radloff

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    Hi Guys.

    A few weeks ago I started up a small nano from spares I had laying around. So I decided to build my own LED unit and I need to know if I am on the right track.

    The LED chips that I am using is Epistar 3w each

    The unit has the following

    3x Warm white LEDs (read that by using this in stead of Cool white that you do not need to use green and red LEDs) Colour temp is 2800-3500k
    4x Aqua Extreme blue colour temp is 450-460nm
    2x Violet UV at 395-410nm

    The Driver/ Power supply is currently running on 10.5v at 700ma max watt output is 30 w and im currently on 27w.

    My question is can I boost the voltage up to 12v without harming the LED chips or should I leave it at the 10.5v output will running it on 12v basically make it a bit brighter?

    If all the lights are on it looks like follow:


    Tank new.jpg

    Tank new.jpg
     
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  3. VicZA

    VicZA

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    what are the LED chips rated for ? Voltage and current ? Where did you buy your LED chips ?
     
  4. JackSplat

    JackSplat

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    What you need to know is the combined maximum voltage drop of all the LED's together. For instance, if you have 10 similar LEDs with a maximum of 3.1V, then do not exceed 31V total. You can get the ratings from the led datasheets
     
  5. Jonathan Radloff

    Jonathan Radloff Thread Starter

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    Ok The Chips I bought from an online shop PE, they are not a sponsor so I won't name them:

    The specs of the LEDS are as follow:

    Warm white.JPG

    Then Aqua Blue:
    Specifications:
    1. Shape:Round​
    2. Color:EXTREME AQUA BLUE​
    3. Wavelength: 450 -460nm​
    4. Size:Ø8MM​
    5. Light source type: High Efficient power led​
    6. Led chips Qty:1 piece​
    7. LED Chip Brand: Epistar​
    8. Forward Current: 700mA​
    9. Forward Voltage:DC 3.0-3.8V​
    10. Total Power:3W​
    11. Colour Rendering Index:>75​
    12. Beam Angle:140°​
    13. Working Temperature: -30°C~50°C​
    14. Life Span: >50,000hrs​
    15. Ambient Humidity: 10%~95%​
    16. IP CODE :IP55​
    17. Safety Certificate: CE/ROHS

    And Violet UV:

    Specifications:​
    1. Shape:Round​
    2. Color:ULTRA Violet UV​
    3. Wavelength: 395-410nm​
    4. Size:Ø8MM​
    5. Light source type: High Efficient power led​
    6. Led chips Qty:1 piece​
    7. LED Chip Brand: Epistar​
    8. Forward Current: 700mA​
    9. Forward Voltage:DC 3.2-3.4V​
    10. Total Power:3W​
    11. Colour Rendering Index:>75​
    12. Beam Angle:140°​
    13. Working Temperature: -30°C~50°C​
    14. Life Span: >50,000hrs​
    15. Ambient Humidity: 10%~95%​
    16. IP CODE :IP55​
    17. Safety Certificate: CE/ROHs

    So Basically they are 9 LEDS with a voltage rating of 3.4v each. so this means I must not go above 31V more or less


    Warm white.JPG
     
  6. Dian6430

    Dian6430

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    Shouldnt the whites be more 14000K?
     
  7. JackSplat

    JackSplat

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    Almost, you have to look at the different ratings put togetger, i.e Vmax = 3x4V + 4x3.8V + 2x3.4V = 34V
     
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  8. Jonathan Radloff

    Jonathan Radloff Thread Starter

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    Thanks guys. Will pop into the local Electrical shop tomorrow and have them ramp it up a bit.
     
  9. jimilutz

    jimilutz

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    Are you running all the LEDs in series? If so, then the max V is not enough to get anywhere near the max output. If you are running them in a few parallel arrays, then the A is not enough. I don't understand how you are using 27w of power on these lights.if the driver is 12v x .7A = 8.4W. Maybe you blow the driver by putting so much power through it. Unless of course you aren't using a driver and just have the LEDs connected directly to the DC power source?
     
  10. Jonathan Radloff

    Jonathan Radloff Thread Starter

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    Yes i will be running them in series, the power supply unit has a voltage range from 14v to 42 v just added a resistor that brought the voltage down. So the unit can be boosted above 40v
     
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