Manic's DIY LED Build Version 2

Discussion in 'Anything DIY Related' started by Manic, 26 Jul 2012.

  1. Manic

    Manic Moderator

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    Hey everyone,

    So I sold my 1000mm x 600mm x 450mm tank a while ago now. This tank ran with 60 Leds (32 Royal Blue, 14 10 000K white, 14 6500K white, all 3w bridgelux). I had amazing growth and the colour was awesome. These leds were mounted on a 600mm x 190mm heatsink using thermal epoxy.

    I decided to stick with the leds on my new tank (600mm x 600mm x 400mm), keeping the same leds and just using a 300mm heatsink.

    So here is the build specs:

    Heatsink: 300mm x 190mm
    Leds: 3W Bridgelux (20 Royal Blue, 12 10000K white, 8 6500K white)
    Drivers: 2 x Meanwell ELN 60-48P (1 for white and 1 for blue)
    Controller: DIY Arduino Reef Controller
     
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  3. Manic

    Manic Thread Starter Moderator

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    I had a few problems with my last build due to the thermal epoxy not holding the leds. Every week or two a different led would come loose and not make contact with the heatsink. This caused the led to heat up to extreme levels.

    For this build I decided to drill and tap the heatsink so that I could screw the leds down onto the heatsink. What a mission but it was well worth it. Here's a pic of the completed unit (Without wiring):

    [​IMG]
     
  4. Manic

    Manic Thread Starter Moderator

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    I used self tapping screws for this build (M3 x 10mm steel self taping screws) with M3 plastic washers to avoid contact with the led terminals. I also used thermal grease under each led to ensure proper thermal contact.
     
  5. Manic

    Manic Thread Starter Moderator

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    Here's the unit complete with wiring (4 separate strings of leds, 10 leds per string). Two strings are wired to each drivers in parallel, so each driver is powering 20 leds.

    [​IMG]

    The driver is rated for 1.3 amps which would then be split to the two strings, so 0.65 amps per sting. This would only run the leds at around 93% power. When I adjusted the current on the driver (SV2) I was amazed to get this driver current with the driver not even turned to it's maximum current.

    [​IMG]

    It just shows that the driver is capable of more than 1.3 amp current as 0.7 amps per string means that the driver is pushing out 1.4 amps. This serves as a warning to everyone using this driver, you need to adjust it prior to use.
     
  6. Manic

    Manic Thread Starter Moderator

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    The problem with running leds in parallel is that if one led blows it will send all the driver current (1.4 amps) through the remaining led string. In order to prevent this I am using 0.8 amp fast blow fuses on each led string. This will hopefully prevent any damage being caused to the remaining leds should a led burn out.
     
    Last edited: 26 Jul 2012
  7. Manic

    Manic Thread Starter Moderator

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    I am planning to use my arduino to control the led drivers. The problem with the arduino is that it output 5V pwm (Pulse width modulation) and the driver requires 10V pwm. In order to control the leds I had to build a circuit that would convert 5V pwm to 10V pwm. The circuit I used incorporated 2n2222 transistors to rapidly switch a 10v power source using the arduino 5v pwm signal. Since I am powering the arduino with a 12v source I decided to use this source to power the transistors as well. I used potentiometers to tune the 12V source voltage down to 10V. Here is my circuit:

    [​IMG]
     
  8. Manic

    Manic Thread Starter Moderator

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    This is all for now. Here's a pic of my led unit (Only 20 of the leds powered), running with the arduino controlling it at 50% power:

    [​IMG]
     
  9. NickW

    NickW

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    wow, those are some serious LED's :), very neat wiring, looks awesome!

    Why are you using this kelvin rating? does it not promote algae growth? and look more yellow? :)

    Keen to see the LED's over the tank!
     
  10. Manic

    Manic Thread Starter Moderator

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    Thanks. The 6500K are the strongest leds and contain the most red spectrum, just wanted to get a good blend of colours. Nutrients promote algae growth.
     
  11. shaunn

    shaunn

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    dude you are a true electronics master:thumbup:
     
  12. durleo

    durleo

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    great build - keep us updated :1:
     
  13. carlosdeandrade

    carlosdeandrade

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    @Manic, excellent build, looks very similar to mine, also using bridgelux 3w but I didn't build mine @Goby did, where did you get your LED's thinking of changing some of my LEDs to 6500k?
     
    Last edited by a moderator: 26 Nov 2015
  14. Manic

    Manic Thread Starter Moderator

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    Lol, I wish. Most of this stuff is open source on the Internet. So just a lot of reading and some basic electronics experience is all you need.
     
  15. Manic

    Manic Thread Starter Moderator

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    Will do. The unit should be finished and hanging above the tank by tomorrow night.
     
  16. Manic

    Manic Thread Starter Moderator

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    Got the LEDs from alibaba. Place is call Future led I think.
     
    Last edited by a moderator: 26 Nov 2015
  17. Clownfish9906

    Clownfish9906

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    hey @Manic

    Any reason you chose that ratio? DId you consider 20000k leds?

    If you have any links to reading material, please post a link...
     
    Last edited by a moderator: 26 Nov 2015
  18. butcherman

    butcherman Moderator MASA Contributor

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    A good warning!

    I have seen people burning out led's because they did not check this prior to running the LED's
     
  19. Clownfish9906

    Clownfish9906

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  20. butcherman

    butcherman Moderator MASA Contributor

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    Yes you are

    The SRV2 (no need to adjust SRV1.) is turned down all the way. Your controller must be set to 100% output. conneting a amp meter in series to your led's and driver you turn on the driver and adjust the SRV2 until the amp meter readys the correct reading to what your LED's are rated for.

    Manic's leds i belive are 700ma so he has adjusted his output accordingly
     
  21. Manic

    Manic Thread Starter Moderator

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    The white LEDs are probably around 14k. They just marked as 10k. On the data sheet it says 10-20k. I ordered 14k ones though.
     
    Last edited by a moderator: 26 Nov 2015
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