坎德拉
坎德拉（拉丁语：Candela），发光强度个单位，国际单位制七个基本单位之一，符号cd。1979年10月第十六届国际计量大会奈坎德拉定义为：给定一个频率为540.0154×1012 Hz个单色辐射光源（黄绿色可见光）搭一个方向，外加该辐射源拉该方向个辐射强度为1/683瓦特每球面度，则该辐射源拉该方向个发光强度为1坎德拉。
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