Tail light rebuild project questions

Discussion in 'The Projects Forum' started by micknwop, Aug 3, 2010.

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  1. micknwop

    Thread Starter New Member

    Mar 11, 2010
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    Hey all, first time post but i've been doing some reading on here. In fact, thats the only reason i've gotten this far. I'm rebuilding a tail light on my dirt motorcycle for visibility purposes at night. My current one is shot and I'm just re-using the housing.

    I have Lumiled superflux HPWT-DH00
    I'm going to be running 4 sets of 4 LEDS in 3 rows. (see picture)

    I'm having issues with what size resistors i need. I've come up with this.

    vF = 2.19 - 3.03 = avg 2.61v
    4 LEDS x 2.61v = 10.44v drop
    Max forward current - 70mA

    14.5v - 10.44v = 4.06v / 70mA = 58ohms
    12.7v - 10.44v = 2.26v / 70mA = 32.28ohms
    11.5v - 10.44v = 1.06v / 70mA = 15.14 ohms

    I dont want to blow the LEDS, nor shorten their life, but would like them as bright as possible.

    What resistors should i go with?
    What do i need for a brake light high/low ?
    Do i need the continuous forward current?
    Where can i draw up a schematic (link)?


    here's a picture. any help is great as i'm sure i'll be needed more along the way. Thanks!

    [​IMG]
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
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