So, any light you add to the darker value should not come close to competing with the initial light value, and vice versa.
因此， 添加到较暗值的任何光都不应该与初始光值竞争，反之亦然。
夜色温柔（上）
These kept their balance best in that environment, and what tone there was, beyond the apartment's novel organization of light values, came from them.
它们在那个环境中保持了最好的平衡，除了公寓新颖的光值组织之外，还有什么基调来自它们。
英语百科
Light value
In photography, light value has been used to refer to a
“light level” for either incident or reflected light, often on a base-2 logarithmic scale.
The term does not derive from a published standard, and has had several
different meanings:
In APEX, luminance value and incident light value are numerically equal, so that for a given “light value”, either meaning 2 or 3 would result in the same camera settings.