Estimation of Flicker of Contemporary LED Lamps and Luminaires

The current paper shows experimentally obtained results for the flicker of LED retrofit lamps. Flicker is unwanted and can lead to the appearance of temporal light artefacts like strobe and phantom effects. Before the mass invasion of the LEDs on the market different measures have been use for estimation of flicker of light sources, but mostly the flicker index is applied. With the development of LEDs new approach and equipment for estimation of flicker is proposed but it is still in research and development phase. Although retrofit LED lamps are now wide spread, the experimental results described in the paper show that some of them are still sources of flicker and care should be taken when they are used for specific applications.