Nedco: Tunable White and Human-Centric Lighting
A standard white light has one fixed colour temperature, measured in kelvin (K). Warm light sits around 2700K, the colour of a candle or an older incandescent bulb. Cool light sits at 5000K or higher, closer to a clear midday sky. A tunable white fixture can move between these settings. A control system changes its colour temperature and brightness on a schedule or in response to sensors, so the same room can feel calm in the evening and focused in the afternoon.
