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LED lightbar power/current draw - Claimed vs Actual

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  • #16
    Originally posted by amts View Post
    My multimeter is similar to this
    Yeh, I doubt that's True RMS. Out of interest, how close does your multimeter agree with your power meter's measurement of current for your light?

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    • #17
      Thanks Leigh. I am trying to find a brighter light than the current 20W fitted. So I bought them and decided to do an experiment out of interest.

      Interestingly, I also measured an 18W round LED work light and it was showing 15.6W.

      Dbc, the current showing on the multimeter is 0.1 to 0.2A lower than the watt meter.

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      • #18
        Next experiment is a 9" 185W round spotlight similar to the ones sold by 4WD Supacentre.

        V=11.9V
        I=13.2A
        P=145W

        So, not too bad this one.

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        • #19
          ..
          Last edited by TCT888; 31-07-2017, 08:59 PM.

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          • #20
            ..
            Last edited by TCT888; 31-07-2017, 08:59 PM.

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            • #21
              My thoughts are that some people based their purchasing decisions on wattage/lumens or a combination of both. Wattage has an implication on current draw on the alternator and wire selection. There appears to be a correlation between wattage and lumens.

              I'm trying to replace a 20W, 1900lumen light http://www.ebay.com.au/itm/MUDDOG-5-...wAAOSw6WdXiEnP


              with a 60W 4800lumen light http://www.ebay.com.au/itm/2x-4inch-...0AAOSw-K9ZD-dn


              Most punters will conclude that the higher the wattage, the brighter the light output. I don't have a light meter for testing but the next experiment is to rip out the existing 20W light and measure the power. Then try and assess the light quality by eye. Granted that one is flood and the other is spot.

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              • #22
                Originally posted by TCT888 View Post
                Yes, I've been stung too with the claimed 693w 'Triple Row' Osram LED Light Bar from an Ebay seller.
                http://www.ebay.com.au/itm/261523486...%3AMEBIDX%3AIT

                The seller didnt realise I had a 150amp power analyzer meter.
                http://www.ebay.com.au/itm/150A-Digi...YAAOSwaB5XlwEK

                Claimed - 693w
                Actual - 174w
                Amps Max - 14.1

                Absolute credit goes to the seller, as he accepted the findings, full refund, and sent a pre-paid label for the return postage.

                BUT, still sells them as advertised 693w.... thats the part I really dont agree with.
                Interesting you brought this particular one up as I was trying to find something reasonable to fit between the bullbar uprights and when I saw 693W, that is a 50A draw. I didn't need something that uses so much power but it is now hard to compare with a similar length lightbar at half the power but is actually close to the stated power draw.

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                • #23
                  ..
                  Last edited by TCT888; 31-07-2017, 08:57 PM.

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                  • #24
                    That looks like a great fit. Do you have a photo of it in action?

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