Fully lit, these would be blindingly bright, and would need tens of amps of power supply (source: I have a strip of 100 WS2813s (I think, anyway the 12V ones) and the 3A supply I have would be fully loaded if they were all on full bright white. These suckers are bright).

However, you can always just limit it in software. Total "brightness budget" for the display, scale everything to dimmer if exceeded.