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I can't get datasheets on these specific products, but I'm hoping there is a generic answer -- like is the length of the strip's internal wiring just causing enough of a voltage drop over the longer length?

These high density strips are 60 x 5050 SMD LEDS per meter, cuttable every 3 LEDS, or 2". I'm assuming these means the strip is constructed with 3 LEDS in series, these groups in parallel.

Why is a 3' strip rated for 14.2 watts and a 9' strip rated only ~2X at 27.2 watts? I no longer have a 9' strip, but when I did 3 x 3' strips in parallel, I can confirm through a killawatt that the power supply draws 48 watts. I expected ~27 watts due to the table claiming that 9' of LEDs would be 27watts.

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  • \$\begingroup\$ "Serial" resistance is higher for 9'... than for 3' ? \$\endgroup\$
    – Antonio51
    Commented Oct 5, 2023 at 16:42
  • \$\begingroup\$ @Antonio51 So basically the internal resistance of the wires (not components) I'm surprised it makes that much of a difference! \$\endgroup\$
    – rrauenza
    Commented Oct 5, 2023 at 16:49
  • \$\begingroup\$ I am also surprised because the first LEDs which are powered "should" be "more" lighted ... \$\endgroup\$
    – Antonio51
    Commented Oct 5, 2023 at 18:21

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