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those really huge displays are often millions of individual RGB LEDs. it would just be a software nightmare to do with hue bulbs.
If they were hardwired yes, but zigbee with millions of bulbs?
I'm guessing you'd hit interference at some point.
But also latency would be bad and you almost definitely couldn't synchronize them well.
Yeah, I've done something similar with ~120 wifi bulbs for a light show that responded to music and that worked fairly well but I doubt it would have worked with more than a few hundred.