Goniometer, Portable, LightSpion TM
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Simply measure beam angle, lumen, cri, colour temperature and lumen per watt with no expert knowledge required. The system is comprised of full spectra spectrometry and a 50K/sec sample power analyser giving you a professional measurement. The LightSpionTM comes with the “Viso Light Inspector” software that connects via USB to your computer.EU Regulation EU No 1194/2012 requires directional light sources luminous flux to be measured within 90° or 120° cone. Luminous flux measurement is normally done at full 360° in all direction. But the new EU Regulation EU No 1194/2012 require that directional lamps are measured in a 90° or 120° cone, meaning that only light illuminated in the cone is calculated efficient luminous flux.
The Viso Light Inspector software v4.2 now supports limited spherical measurements making it easier than ever to test your light sources against the new standard.
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How do I calculate UGR values in Light Inspector software?
At present, the Light Inspector software does not calculate the UGR values itself. In order to figure out the values you can use another open source software, for example LDT Editor. UGR values depend on the placement of an observer. The LDT Editor offers a table with multiple positions for an observer as an overview of how the UGR values change relative to position. Therefore the angular intensity distribution needs to be symmetric for their algorithm to work. If your light source doesn’t have a symmetric distribution, you can make an adjustment in the Light Inspector software (Edit -> Photometric -> Corrections -> Correct Asymmetry). Export your measurement then in an LDT format and open it in the LDT Editor. The table with UGR values is shown under Light Distribution tab. Additionally you can calculate the exact UGR values for a specified observer's placement in Dialux.
Expert: Cécile Mercusot