Labsphere's far-field goniophotometers are used to measure the luminous intensity (in candelas) from automotive lighting as well as from LEDs and general lighting products. We offer far-field goniometers conforming to the motion requirements of IES type A, C (moving detector), type C (moving mirror - in compliance with IES LM79-08) and a new type D system which has been purpose designed for testing LED-based solid state lighting. Data files generated include IES and LDT (EULUMDAT) formats for lighting design applications. The Labsphere LSA-3000 is a compact and highly affordable goniometer for measuring the far-field intensity of single LED emitters. For reference, a far-field photometric measurement is one where the detector is placed far enough away from the light source that the source behaves as though it were a point emitter of light, and the inverse squared relationship applies. In practical terms, the source-to-detector distance should be at least 5-10 times the luminous aperture of the device under test, but the distance chosen must be much greater if you are testing very narrow angle sources of light (e.g. automotive headlamps, spot lights etc).
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Pro-Lite offers goniophotometric measurement services