On: Building DIY LED strips for fun

[xxs]

5V is extremely bad from efficiency point of view. The voltage drop over an LED is ~3V, that leaves 2V to be sent through the current limiting resistor (dissipated as heat). There could be only a single LED (no series).

[detaro → xxs]

These strips have a chip and individual control for each RGB LED that work on 6V max, so "higher voltage would be better" doesn't really make sense for them (unlike strips where all LEDs in the strip are driven the same, without individual control).

[xxs → detaro]

Obviously, I didn't mean addressable RGB LEDs, just regular LED (white) strips that can be cut (in the context of the grandparent's comment)