Need help with picking PO/TRIM for new light- Mtbr.com
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  1. #1

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    Mar 2009
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    Need help with picking PO/TRIM for new light

    I'm in the process of building a new set of lights each running a K2 200lumen LED (vf 3.65) with a Luxeon 3021 buck driver and can't figure out what size Trimpot or Pot to put on one of them. Each will have a hefty heatsink (3/8 aluminum slug in a aluminum tube shell).

    The first will be a helmet mount and the other a handlebar mount. Each have the same hardware though for the helmet mounted one I want to run it at 700mA so I'm thinking I can use a Trimpot to limit it, either that or a Pot that I can mount through the casing to control it externally.

    I'm driving it with either a 4x1.2v AA 2650 mah NiMH batteries or a 6x1.2v AA 2650 mah NiMH batteries. The choice for sticking with NiMH AA batteries is that the setup is for ultra distance riders and I want the option to be able to use batteries from whatever store I can find en-route.

    Any ideas? I'm lost when they show the sizes as as 2K, 5K, 10K....

  2. #2
    aka RossC
    Reputation: ocean breathes salty's Avatar
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    Oct 2006
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    936
    Quote Originally Posted by paul.oharahoke

    Any ideas? I'm lost when they show the sizes as as 2K, 5K, 10K....
    5K - you can buy a version of the buckpuck which comes with an exernal dimming pot and it is a 5k. I subsequently ham fisted it and broke the pins off. The smallest I could find locally was a 10K. While it worked, there was less than a quater of a turn from off to full bright.

  3. #3

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    Thanks

    Thanks - I appreciate the direction. My understanding of Ohm's law is a tad rusty.

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