近光源实验证明了P_3近似理论能够描述光源附近光辐射分布。
The experiments prove thatP3 approximation theory can describe the radiance close to sources.
该原则同样适用于侧光：侧光源离被摄主体近时，整个画面的光线衰减将比光源离主体远时更明显。
The same holds true for sidelighting: With a light close to the side of your subject, the falloff of light across the frame will be more pronounced than if the light is farther away.
本设备是以长弧氙灯为光源，模拟和强化耐候性加速老化的试验设备，以快速获得近大气老化的试验结果，用来评价材料的耐侯性。
This equipment use long arc xenon lamp as light source imitate and strengthen weatherability accelerate ageing to get near air ageing test results quickly then evaluate the material weatherability.
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