MacAdam steps or SDCM is a common way of expressing color difference in light sources – but is also widely misinterpreted. Here is everything you need to know to use […]
These questions and many more are answered in a recent free-to-download publication from the Lighting Research Center (LRC – USA). This highly recommendable 55-page online document is called “Lighting Answers: […]
Light measurement standards require LED lamps and luminaires to be placed in their normal burning position during measurement. Further, rotation during measurement should be minimized to keep natural cooling. Doing otherwise would certainly lead to gross errors when measuring old […]
A giant international interlaboratory comparison, IC2017, including 37 light measurement laboratories in 18 countries was conducted in 2017 through 2019*. General results are not yet public, participating labs have received their own results. In […]
Many clients asked us to explain the fundamentals of glare and UGR. A standard Viso report output is the UGR table. This 9-minute video will give you insights and overview
The Viso LightSpion portable goniometer system was tested at the Technical University of Danish (DTU). Senior scientist Carsten Dam-Hansen (DTU Photonics) tested a series of LED light bulbs in their […]
