Emergency lighting

An emergency light is a battery-backed lighting device that switches on automatically when a building experiences a power outage.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY 4.0

LUMINOSIT

The science of light, made practical — photometry in plain English, plus the lumen, lux, candela, and energy calculators every lighting decision needs.

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Every species, image, fact, and figure is drawn from Wikipedia and Wikimedia Commons, used under public-domain and Creative Commons licenses. No content is AI-generated.