剪影效果是背面光照场景的显著特征： 顶端光照(Lighting from above) ： 顶端 照明在通常情况下并不常见，多见于阴天，也有可能出现在正午的阳光下。在一些内部环境中，会用作舞台的照明。
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Again, lighting from the side, above, or below, by casting deeper and longer shadows, creates the sense of volume.
同样，侧光、顶光和底光能够在物体上投射出深而长的影子，从而制造出立体感。
Light emitted from above and to the side when applied to portraits creates what is often referred to as "Rembrandt lighting". This form of lighting emphasizes edges and depth.
高位侧光一般用于拍摄人像，通常称为“伦勃朗用光法”，这种用光方式强调边缘和深度。
From above table, due to the high luminous efficacy XED energy-saving lamps, 150w XED special energy-saving lamp can replace 400w high High-pressure sodium lamp to gain the same road lighting effect.
从上表可以看出，由于XED特种节能灯的高发光效率，150w XED特种节能灯可替代400w高压钠灯，达到同样路面照明效果。
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