Trunk Lighting for Showcar, Current regulator w/

Discussion in 'The Projects Forum' started by schfiftyfivefive, Oct 9, 2011.

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  1. schfiftyfivefive

    Thread Starter New Member

    Oct 9, 2011
    So I finished my trunk display for my car, custom subs boxes and suede lining, pretty pleased. I'm in the midst of doing the lighting now, I've wired a harness straight from the battery with a relay triggered from the ignition.

    I ordered a few Osram 1 amp 1.5 Vf LED chips, I plan on having about 4 of them to light up the entire trunk (they're very bright)

    I've never done much for LEDs before, but I understand that I'll need a current regulator to control the brightness. If I have 4 in series, will the last 7.5v (13.5v-(4ledsx1.5Vf)) be given off as heat in the current regulator, or will I need a voltage regulator as well?
  2. #12


    Nov 30, 2010
    Depends. A linear regulator burns off the excess, a switching regulator only loses 10 to 20% as heat. You can look up "Buck Puck" or examine for a switch mode constant current LED driver.
  3. circa27


    Feb 22, 2011
    Thanks, I was researching the buck pucks, and I see they have 7 pins. I also read that the red/black are obviously power/ground, the blue/white are LED +/-, and the yellow/grey are control pins for pwm or strobe sources or w/e you might be using.

    Thats still only 6 pins, and on this picture I see no color coding..?

  4. Georacer


    Nov 25, 2009

    Welcome to the AAC forums.

    This thread is a violation of the AAC forum rules, Chapter 6, as seen here:
    Namely, automotive modifications of any kind are strictly forbidden.
    Therefore, this thread will be closed.

    Please understand the reasons behind this action and bear no grudge.
    Feel free to tread on the rest of the forums.
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