对于给定的观察者位置，和给定的光源位置或者与光源相关的发光表面来说，该表面或曲线上各点的亮度相同。
Locus of points on a surface at which the luminance is the same, for given positions of the observer and of the source or sources in relation to the surface.
对于给定的观察者位置，和给定的光源位置或者与光源相关的发光表面来说，该表面或曲线上各点的亮度相同。
Locus of points on a surface at which the luminance is the same, for given positions of the observer and of the source or sources in relation to the surface.
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