LED Tape Max Run Before the Far End Dims
The inverse of the led-tape-run tile: the longest single end-fed run before the far end dims past your drop tolerance, len_max = voltage x sqrt(2 x (tolerance/100) / (power_per_ft x resistance_per_ft)). A 4.4 W/ft 12 V strip at 0.05 ohm/ft walls out at about 11.4 ft for a 10% drop; a 24 V strip reaches roughly double (the run scales with the voltage). Answers 'how far can I run this tape' instead of checking one length. Oversizing the PSU does not extend it -- power-inject or feed both ends. The strip datasheet governs.
Formula and source
len_max = voltage x sqrt(2 x (tolerance/100) / (power_per_ft x resistance_per_ft)); the inverse of led-tape-run's drop_pct = power_per_ft x resistance_per_ft x length^2 / (2 x voltage^2) x 100.
Constant-voltage LED strip voltage drop solved for the run length, by name.
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