after having several experience now with diffrent strips and setups:
i would like to add that injecting power on 5volt ledstrips in the middle of the strip above 200 leds ( 60l/mtr types) is really recommended.
I upgraded from APA102 (30l/mtr 130leds) to HD107s (60l/mtr 260leds) and had to alter a few things.
-increase glassfuse from 6A to 20A > drawing around 14 Amps on 5 volts at 100 brightness
-injecting extra 5v/GND power in the middle of the strip.
-combining leads ( white/red) ledstrip power extra at begin at end of ledstrip.
-increasing gauge wires from 1.0mm to 3mm ( 2x 1,5mm2)
if you don't then the colours will be off
you can't run the leds at full brightness but only 30% ! > more brightness will result in colour failing, especially the whites..
goodluck with your build everybody, video of HD107s will be coming