What Voltage to Choose For 1000 Lumens DIY L.E.D. Headlamp?- Mtbr.com
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  1. #1
    mtbr member
    Join Date
    Oct 2016

    What Voltage to Choose For 1000 Lumens DIY L.E.D. Headlamp?

    Dear Friends,
    I want to build a 1K lumens D.I.Y.headlamp but don't know how to decide what voltage the battery should be.

    What question do I have to answer to decide?
    I know that I want the light to be able to last for at least two hours, if not more, between charges.

    I understand technical stuff better than average folks and I completed a Basic electronics course thirty years ago, yes I am a bit rusty but I am up to the task.
    Sincerely Jon

  2. #2
    mtbr member
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    Nov 2009
    Add up the forward voltage of the LED's you're using, and add 2v for the driver you're planning on using and thats about where you should be. You can use a higher voltage battery, but you lose efficiency if you're going nuts. No need for a 20v battery to drive a single XML.

    ... in short, just buy a 8.4v battery made up of four 18650 cells. Thats pretty much the standard. It'll do 1000 lumen easy, for a couple hours easy. I would use two LED's instead of blasting one with enough current to made 1000 lumen, to keep heat down.

  3. #3
    mtbr member
    Join Date
    May 2005
    Pretty solid advice ^.

    I'd change one thing though. If you are using a switching type driver, then the ~2V overhead is good advice. If you are using a linear regulator type driver then less difference is better.

    In doing your calculations, work with 7.4V for a 2S battery. Though it will be ~8.4 fresh off the charger, they quickly drop to ~7.4 under a load.

    Post pics of what you build!!!
    GoPro adapters for bike lights http://www.pacifier.com/~kevinb/index.html

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