A Goniophotometer is a device used for measurement of the light emitted from an object at different angles. The use of goniophotometers has been increasing in recent years with the introduction of LED-light sources, which are mostly directed light sources, where the spatial distribution of light is not homogeneous. Due to strict regulations, the s...
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http://en.wikipedia.org/wiki/Goniophotometer
photometer for measuring the directional light distribution characteristics of sources, luminaires, media or surfaces
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=845-05-22
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