カンデラ
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定義
SI基本光度の単位で、540 THzの単色放射の発光効率を683 lm/Wに固定することで定義される。
解説
One candela approximates the luminous intensity of a common wax candle, from which the unit takes its name. A 60-watt incandescent bulb emits roughly 60–80 candela in all directions. The candela specifically measures intensity in a given direction, making it the foundation for both lumen (total flux) and lux (illuminance) calculations.
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