Light Quality Blog

LEDs OLEDs and other light sources quality measures and technology

Month: January 2018

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

How to, Instruments, Publications, Standards
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

Publications, Standards
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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