坎德拉
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定义
SI发光强度基本单位，通过将540 THz单色辐射的发光效能固定为683 lm/W来定义。
解释
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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