2700K – Very warm (residential, cozy)
3000K – Warm (hotel rooms, restaurants)
4000K – Neutral (offices, supermarkets)
5000K–6500K – Cool (industrial, task lighting)
Never mix CCTs in the same visual zone without dimming/zoning control.
Data point:
Our 3000K vs 4000K test in a clothing store showed:
3000K increased warm-colored product sales by 12%.
4000K increased browsing time by 18% (sharper contrast).
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