Candela: Unit of luminous intensity of a light source. It is defined as 1/60 of the luminous intensity per square centimeter of a black body radiator at the temperature of solidification of platinum. Symbol: cd.

• 烛光:光源发光强度的单位。一烛光是一个黑色国辐射物体在白金凝固的温度下每平方厘米所发出光度的1/60。符号是cd。