cutoff angle of a luminaire 灯具遮光角
angle of cutoff 截止角
cutoff elevation angle 截止高度角的
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However, if the beam Angle for the direct light is too wide then it will violate the limits of a full cutoff classification.
然而，如果给直接的光光线角度太宽，那么它将会违犯完整近路分类的极限。
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