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Sunlight is abundant and universally appreciated—so why not put it to work indoors? That’s exactly what daylight harvesting does. By automatically adjusting electric light in response to the natural light streaming in through windows, this strategy helps hospitals reduce energy use, lift patient and staff comfort, and stay ahead of evolving energy codes. The catalyst is compact yet powerful photosensors that continuously monitor a space and signal adjustments as conditions change. In practice, these sensors measure the amount of daylight entering patient rooms, corridors, lobbies, or other hospital zones. That data is fed into a lighting control system. When daylight is strong enough – that is, it fulfills the light levels of a space – the system dims or even switches off the electric lighting, and as natural light fades, whether from cloud cover or dusk, the fixtures brighten again. The seamless interplay ensures that spaces always feel evenly lit, no matter the hour.