Common cathode is a power-efficient driving method used in higher-end outdoor LED systems.
Instead of one shared voltage rail, RGB channels are powered separately, so each color gets only the voltage it needs.
In real DOOH deployments, benefits usually include:
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lower cabinet temperature
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~20–30% power savings (system dependent)
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better stability under high brightness operation
In r/CommercialAV-style discussions, it’s mainly chosen for large 24/7 signage networks where heat and electricity cost matter more than upfront hardware price.
