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Thread: Cree Light

  1. #1
    Join Date
    Aug 2012
    Location
    Madison, WI
    Posts
    104

    Default Cree Light

    Anybody have the XML? Is that little bastard supposed to get that hot?

  2. #2
    Join Date
    Nov 2008
    Location
    Hampton, IL
    Board Position
    Trail Steward - Illiniwek; Web Director
    Posts
    1,875

    Default

    I built a high power LED light a few years ago and when doing research on LED thermal management found it is common for operating temps to reach +120F. This is hot enough that you wouldn't be able to touch it for more than a few seconds. If the light feels hot to the touch, it probably just means the heatsink is doing its job well. If the LED became detached from the heatsink it would burn out in a matter of seconds on full power and the light wouldn't feel hot.

    A heatsinks ability to dissipate heat depends on how much air is flowing over it and the ambient air temp. If the light is powered up indoors and sitting on a table it will get much hotter than when riding with it. My light sometimes kicks into thermal protection mode (turns off) when climbing hills on hot summer nights or waiting at stoplights. I like to use this "feature" as motivation to ride faster up the hills.

  3. #3
    Join Date
    Aug 2012
    Location
    Madison, WI
    Posts
    104

    Default

    Awesome. Thanks for the info.

  4. #4
    Join Date
    Oct 2012
    Location
    Davenport IA & Philadelphia, PA
    Posts
    110

    Default

    yeah, they do that. don't touch...
    Lance Lau

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