Light Quality Blog

LEDs OLEDs and other light sources quality measures and technology

Month: April 2021

Methods for measuring the new PstLM flicker index according to the ecodesign requirements for LED lighting

Design, How to, Instruments, Standards, Technology
The revised regulation of the European Commission on ecodesign for light sources introduces new requirements for light flicker indicators, including PstLM, which determines the resistance of the light source power supply system to network disturbances. PstLM stands for Short Term Perceptibility for light modulation. The new requirements enter into force in September 2021 and will [...]

What is the minimum photometric distance? Introduction to photometric measurements part 1

How to, Instruments, Technology
Photometry is the science of light measurement, which takes into account how the human eye perceive its brightness. It measures only the visible spectral range, where human eyes are sensitive. Photometric measurements are crucial in quality testing and new product development, starting with single LEDs through modules and lamps up to luminaires used in buildings [...]

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