Luminaire and integrating sphere size impact measurement accuracy

Standards prescribe integrating sphere size based on luminaire size, but MIKOŁAJ PRZYBYŁA explains that, for many product development and test purposes, a smaller sphere can deliver acceptable measurement accuracy. Published on: March 27, 2018 in LEDs MAGAZINE By Mikołaj Przbyła  GL Optic Integrating spheres are fast and convenient tools for measuring the radiant or luminous flux of light sources. Such [...]

White LED light sources – quality and colorimetric characteristics

Optical radiation in the visible range, primarily white light with correlated colour temperature ranging from 3000 to 6500 K, can be emitted by electroluminescence diodes available in different technologies. For this reasons LED modules, integrated LED lamps and LED luminaries differ with respect to the quantity and quality of emitted radiation. Reliable measurements and comparisons [...]

Using Integrating Spheres Correctly to Measure LEDs

LEDs have opened up new dimensions of design freedom, allowing architects and designers to give free rein to their creativity. Light-emitting diodes permit manifold design solutions as a light source in illumination products. However, a suitable measuring method for comparing key technical data is required in order to get the best out of the diversity [...]

Practical Guidelines for Sphere and Goniometer Measurements in View of CIE S 025/E:2015

The latest CIE S 025/ E:2015 standard provides the conditions required to perform reproducible photometric and colorimetric measurements on LED lamps, LED modules, and LED luminaires (LED devices).  The main goal here is to obtain reliable and accurate photometric data for LED devices and ensure that the data is consistent, meaning that the results are [...]

MacAdam ellipses and determination of tolerance and chromaticity changes of light emitted by lamps

A MacAdam ellipsis is a region on a chromaticity diagram which contains all colors which are indistinguishable to the average human eye from the color at the center of the ellipse. The contours of the ellipse represent the just noticeable differences of chromaticity. MacAdam ellipses help to show differences of chromaticity between two light sources [...]

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