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Thread: Car Low Beam Halogen Flashlight

  1. #1
    Flashaholic*
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    Default Car Low Beam Halogen Flashlight

    I know nothing about building or modifying lights, I'm sure this will be painfully obvious in the next sentence. Can you drive a low beam halogen lamp [from a car] with 4xCR123's?

    If the answer is yes, about how long would one battery set last? Has anybody built such a light?

    If the answer is no, please enlighten me as to why.

    TIA

  2. #2

    Default Re: Car Low Beam Halogen Flashlight

    Most likely...but the runtime will be very, very short. (probably a couple minutes)

  3. #3

    Default Re: Car Low Beam Halogen Flashlight

    If you really want to make something slick, try your hand at a HID arc flashlight. Those are the spiffy new ones coming on the top-of-the-line luxury cars. Not only do they run on low voltages (because they need a step-up circuit anyway) and are obviously VERY bright, but they also happen to be very efficient! A set of D cells running one of those lights would likely last several hours. Lumens per watt is way more than Luxeon.

  4. #4
    Flashaholic Spectre's Avatar
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    Default Re: Car Low Beam Halogen Flashlight

    A halogen car low beam is usually about 55 Watts/12V (H4, H3 etc). That results in a current of more than 4 Amps (!), and I dont think 4 CR123s is able to give you 12V at that current. You probably have to use 5 CR123s or connect 8 ones using a parallell/serial configuration to get high enough voltage.

    For comparison: The Surefire 500 lm N62 lamp is using 4 CR123s with a current of 3.7 amps. At that current the batt voltage is below 8V. (Source: Brocks flashlight site - look at the top of the table at the bottom of the page).

    Bjorn

  5. #5
    Flashaholic*
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    Default Re: Car Low Beam Halogen Flashlight

    Did I read someplace that there is a limit to the number 123 you could use in series [safely]?

    If MN21 can suck 4.7 amps at 6.1 volts for 20 minutes with 3x2 configuration, then would it be safe to say that a 3x4 configuration could support 4 amps at 12 volts for about the same length of time?

    Does anyone know the lumens rating for an H4?

  6. #6
    Flashaholic*
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    Default Re: Car Low Beam Halogen Flashlight

    [ QUOTE ]

    Does anyone know the lumens rating for an H4?

    [/ QUOTE ]
    Yes. http://www.lighting.philips.com/nam/.../mini_seal.pdf

    1000lm low, 1650lm high.

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