Fig. 3From: Characterization of the angular response of a multi-directional spectroradiometer for measuring spectral radianceExperimental setup for measuring the angular response of a radiance input optics. A 100 W halogen lamp is mounted on the normal direction of the input optics (θ=0∘) at a distance of 90 cm. The radiance of the lamp is measured as a function of the angle θ maintaining a constant distance rBack to article page