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What is the traditional term for measuring light intensity?

Foot-candles

The traditional term for measuring light intensity is foot-candles. This unit is defined as the illumination produced by a uniform light source of one candela that illuminates a surface from one foot away. It primarily measures how much light is received by a surface and is often used in various fields, including photography and architectural lighting design.

While lux and lumen are also relevant to light measurement, they pertain to different concepts. Lux is the metric unit that measures illumination using the SI system and represents lumens per square meter. Lumen measures the total quantity of visible light emitted by a source, regardless of the area it covers. Watt is a unit of power and is not directly related to the measurement of light intensity but rather to energy consumption.

Understanding these distinctions clarifies why foot-candles is the traditional term specifically tied to measuring how light intensively illuminates a surface.

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