Recent content by jbwiden

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  1. J

    BT40s rectangular window function?

    I just picked up a BT40s from revtronic and I'm wondering what a little rectangular clear window is on the front of the light. Edit: spoke with revtronic they say it's simply a part of the mold
  2. J

    Led lights for motorccyle

    Thanks for the great input, the Culite design looks very appealing. I guess it is a very similar style to the light I had made before. Run a few smaller leds with relatively large optics and one driver. But for this I really do not need to have dimming like I programmed in with the last set of...
  3. J

    Led lights for motorccyle

    I have previously made two LED lights for my mountain bike. The casing was a design found online and Ledil optics with cree XRE Q5 with my own micro-controller and UI. But now I want something for my dirt bike. I do not currently have the time to make more for the motorcycle but was...
  4. J

    MCE in parallel

    I see many people who run the LED's in parallel what concerns me is thermal runaway. I thought LED's have negative temperature coefficients and thus as it heats lowers Vf and draws more current (positive feedback)... Is it not a problem as the LED's are on the same die and they all see the same...
  5. J

    Halogen inrush current

    12v system. the 60watt bulb should steady state draw about 5 amps (just using nominal values). I bought a waterproof 25 amp switch which seems like it will be adequate. Thanks for the help, Josh
  6. J

    Halogen inrush current

    I have a motorcycle and would like to use a switch in order to turn off the headlight(it is a dualsport and when offroad I would rather not have the headlight draw the extra power). So my question is how much inrush current do halogens(55w low /60w high) draw and for approximately how long? This...
  7. J

    LED dimming

    Maybe I am wrong but it seems to me that the pot would actually be more efficient than the microcontroller. if I used the microcontroller only, then i would set the drive current to one amp so i could get the full range of light. but according to the cree data sheet the led will be less...
  8. J

    LED dimming

    I am making a bike light using 3 Cree XR-E LED's and a Buckpuck. The Buckpuck can be dimmed using PWM or lowering the current with the use of a audio taper pot. Is there any reason to do one method over the other? I am already going to be using a microcontroler so the PWM adds no complexity...
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