1. A unit of luminance equal to1/x candela per square foot. 
   英尺朗伯等于每平方英尺1／x新烛光的亮度单位
2. a former international unit of luminous intensity; now replaced by the candela. 
   旧制光强度国际单位；现在已被烛光取代。
3. a unit of luminous flux equal to the amount of light given out through a solid angle of 1 steradian by a point source of 1 candela intensity radiating uniformly in all directions. 
   光通量单位等于一国际烛光照射在距离为一厘米面积为一平方厘米的平面上的光通量。
4. A unit of retinal illumination, equal to the amount of light that reaches the retina through1 square millimeter of pupil area from a surface having a brightness of1 candela per square meter. 
   光度视网膜亮度单位，相当于每平方米有一烛光亮度的表面，通过一平方毫米的瞳孔区域，到达视网膜的光线数量
5. The unit of luminous flux in the International System, equal to the amount of light given out through a solid angle by a source of one candela intensity radiating equally in all directions. 
   流明（光通量单位）国际度量系统中的光通量单位，等于一烛光的均匀点光源在单位主体角内发出的光通量

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