What's the best power injection method for addressable LED RGB Strips?
simulate this circuit &ndash; Schematic created using CircuitLab
Do not daisy-chain the ground nor the power through the data cables. Otherwise an excess current will run through these. You cannot tell the current to take the power cables only. It will take all available paths.
Only ever daisy-chain the single data wire.
(It's unimportant which end of a strip you connect the power to. Just don't daisy-chain it.)