1. The unit of brightness in the centimeter-gram-second system, equivalent to the brightness of a perfectly diffusing surface that emits or reflects one lumen per square centimeter. 
   朗伯在厘米－克－秒制中的一种亮度单位，相当于完全漫射的表面上辐射或反射1流明每平方厘米的亮度
2. A unit of illuminative brightness equal to one candle per square meter, measured perpendicular to the rays of the source. 
   尼特照明亮度单位，相当于每平方米烛光。与光源发出的光垂直来测量
3. a cgs unit of illumination equal to the brightness of a perfectly diffusing surface that emits or reflects one lumen per square centimeter. 
   厘米克秒单位之中的照度等于反射或反射一流明每平方厘米的完全漫反射的亮度。
4. The degree of brightness of a celestial body designated on a numerical scale, on which the brightest star has magnitude-1.4 and the faintest visible star has magnitude6, with the scale rule such that a decrease of one unit represents an increase in apparent brightness by a factor of2.512. 
   星的亮度用数字化尺度表示出来的一个天体的亮度，最亮的星的星等为－1。4；最昏暗的星等为6，在这种度量的规则下，星等减小一个单位表示外观亮度增强2。512倍
5. 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

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