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GR3光学参数:几何为ASTM-E-1709,入射角为-4度,观测角为0.2度,0.5度,1.0度,测量范围为Φ30mm/1.2inch和Φ15mm/0.6inc。光谱响应A光源和视见函数V(λ)符合ASTM E 1709 第6.4.2节(滤光片选择)的要求。范围(cd•m-2•|x-1)为0-2000。