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led lights

Discussion in 'LEDs and Optoelectronics' started by giorno71, Jan 28, 2013.

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  1. giorno71


    Jan 28, 2013
    i want to make custom signal light for my jeep, i have two led flashlights that i want to use.
    so my question is; the flashlights have 9 led's in the board, it runs off 3 AAA batts or 4.5 volts, how do i figure out what resistor to use to hook up to my 12v system?
    i have no info on the leds contained in the flashlights.

    Thank you
  2. davenn

    davenn Moderator

    Sep 5, 2009
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