Candela:
The candela (/kænˈdɛlə/ or /kænˈdiːlə/; symbol: cd) is the SI base unit of luminous intensity; that is, power emitted by a light source in a particular direction, weighted by the luminosity function (a standardized model of the sensitivity of the human eye to different wavelengths, also known as the "luminous efficiency function"). A common candle emits light with a luminous intensity of roughly one candela.
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坎德拉:
坎德拉（Candela），发光强度的单位，国际单位制七个基本单位之一，符号cd。
zh.wikipedia.org
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Candela坎德拉