How to power a 100W LED from a 12v power source. A second hand heatsink and fan from an old computer works to draw heat away from the LED, while a DC/DC boost converter transforms 12 volts DC up to about 35v and regulates the current to 3 amps.

By Julian

Youtuber, shed dweller, solar charge controller aficionado

15 thoughts on “Led tutorial: light a 100w led from 12v – simple cheap”
  1. Avataaar/Circle Created with python_avatars Heard And Tested says:

    I got 4 100watt led on the front of my car very close to my license plate and it completely blinds the toll cameras ๐Ÿ˜‚.

  2. Avataaar/Circle Created with python_avatars Nevem Senki says:

    ร‰s a ventilรกtort hova kรถtรถd ????????!!!!!

  3. Avataaar/Circle Created with python_avatars Joseph Verghese says:

    Thank you so much for the explanation, really clear

  4. Avataaar/Circle Created with python_avatars Garfield Diy Solar says:

    hi do you know the mosfet part number on this unit,,,,just burn up mine after 6 years,,how ever i have some mosfet around here and i am try to repair it but cant see the number,,,any help

  5. Avataaar/Circle Created with python_avatars motaz hussein says:

    Thank you so much for your help I have the same module and I had no idea how to set the current correctly and how to measure the amps, your guide helped me ๐Ÿ‘Œ๐Ÿป๐Ÿ‘Œ๐Ÿป๐Ÿ‘Œ๐Ÿป

  6. Avataaar/Circle Created with python_avatars Weston LeClair says:

    Man I'm just trying to build a gigging light.
    I'm boosting 12v to 48v with a step up driving two 100w led cob epoxy to heat sink. Step ups are pushing as high as 8A rating.
    I'd had them wired in parralel and I think just destroyed everything.
    I've got $200 in less and boosters and now idk what's fryed or not….but I know it's not flounder.
    Anyone have recommendations for reading material as I clearly don't have an endepth knowledge as I thought.
    I appreciate the video. I like the clear articulate information man.

  7. Avataaar/Circle Created with python_avatars Angel Ramos says:

    Do u sell does

  8. Avataaar/Circle Created with python_avatars oumo says:

    Honestly this video was excellent. Just plain excellent. This was exactly what I needed to help me figure out what I was doing wrong with my project. Thank you for this instructional man.

  9. Avataaar/Circle Created with python_avatars Joel Resto. ju untitled g tu u4 II says:

    Looking some some advice….
    I have a 1200w booster trying to connect it to my ebike. The connections are all done right (negative to negative positive to positive on both ends of the booster ) every time I connect the battery to the bike the battery percentage goes way way down and doesn't want to turn on. My battery voltage is a 48v amd the booster has a rating of 24v to 60v in and up to 100v out. Any advice would be great. Thanks!

  10. Avataaar/Circle Created with python_avatars Garry Nutter says:

    Julian, Can you please do a updated version of this project please ?

  11. Avataaar/Circle Created with python_avatars Brandon Sprague says:

    I know this is an older video but there is so much capacitance on the output of imported boost converters that I do not recommend giving the voltage limit a "margin" as the large output capacitor can dump that much more energy in a short time into your circuit. Current peaks much higher than OCP setting for up to a couple of seconds depending on load and margin used.

  12. Avataaar/Circle Created with python_avatars Burning Questions says:

    No, what I really want is a $1500 watt led.

  13. Avataaar/Circle Created with python_avatars Exotic Rock Productions says:

    Could I use an 8a 12v input and get the same brightness?

  14. Avataaar/Circle Created with python_avatars Andraลพ Jenkole says:

    Julian, great tutorial, you made it so easy. One question: where would you put dimmer? Before or after booster? tnx

  15. Avataaar/Circle Created with python_avatars sam fg says:

    I am an indian but i am fan of you.

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