Light pollution

Light pollution is the alteration of the natural patterns of light and dark in ecosystems, resulting from the unnecessary and inefficient use of artificial lighting. Specific categories of light pollution include light trespass, over-illumination, glare, light clutter, and skyglow. A single offending light source often falls into more than one of these categories.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 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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