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Thread: 12 volt twisty CFL

  1. #1
    Flashaholic* JohnR66's Avatar
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    Default 12 volt twisty CFL

    Just a heads up. I saw a 12 volt 13w twisty CFL available at Menards. I've seen them online for kind of a high price plus shipping, but this one is $9. Not cheap, but perhaps useful camping, RV or off grid/power outage. I didn't have enough $$ on me to get one to test, but I will pick one up next time around.

  2. #2
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    Default Re: 12 volt twisty CFL

    What's the brand/part# and what type of base?

    Dave

  3. #3
    Flashaholic* JohnR66's Avatar
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    Default Re: 12 volt twisty CFL

    Not sure of brand. Medium screw base, 600 lumens. It think it said 8000 hour life. At 600 lumens, 13 watts, it has a hot ballast or is overstating power draw. I find low voltage fluorescent items to under drive the lamps, so it may not be drawing the power it is rated at. It will be interesting to test it out.

    Edit: found it here on Home Depot site. Looks like same package.
    http://www.homedepot.com/webapp/wcs/...7X-_-100653123
    Last edited by JohnR66; 12-20-2009 at 08:05 PM.

  4. #4
    Flashaholic* JohnR66's Avatar
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    Default Re: 12 volt twisty CFL TESTed

    I stopped by Menards and picked on of these up.

    At 13.9 volts it draws 1.1 amps = 15.3 watts
    It is slightly brighter than a 120 volt Sylvania mini twist CFL I had although it has some use on it. It is slightly less bright than a standard life, soft white 120 volt 60 watt incandescent. I'd say it equals a 55 watt incan.

    At 13.5 volts it was drawing 1 amp = 13.5 watts

    I could not test other voltages as my variable supply would not start it because of high starting current.

    Color temp is the typical warm white CFL type. Color looked nice without strong green or pink colorations although it is slightly more pinkish than incan.

    Polarity is not an issue. works on DC in either polarity. Ballast felt warmer than a 120 volt CFL probably due to the extra 1.5 watts lost in a full wave bridge.

  5. #5
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    Default Re: 12 volt twisty CFL

    Good review; just don't forget it's 12v dc and accidentally
    plug into a regular ac socket...! I've always been bugged by
    why they don't use different bases. I've got some really old
    photgraphic flash bulbs which also use this base...could cause
    quite a stir!

    My primary interest is emergency lighting, have tried a regular
    CFL with lighter-plug 12dc-120ac inverter, powered by jump-start
    battery booster pack (15Ah gell cell). Overall efficiency looks
    like at might work out about the same, due to the inverter.
    With 11W CFL, measured ~0.95A at 13v (12.4W). I've also
    used strings of white Xmas lights as low-level emergency
    lighting, not that it's needed very often.

    Dave

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