A novel optical device offers multiple detection benefits for light source and luminaire characterization as well as for surface scatter measurements.Ron Rykowski and Kevin Chittim, Radiant Imaging Inc., and Sipke Wadman, Royal Philips Electronics Nederland BVMany photonic applications require the ability to calculate luminous intensity; that is, light intensity as a function of angle. For example, measuring output as a function of angle helps characterize light sources, luminaires and displays, and the angular distribution of scattered light from a surface is used to assess surface roughness for products as diverse as paper, painted metal, protective films and high-performance optics. 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