Discussions | Mar 19, 2016

Discussion: Lighting Flicker of LED Lighting Systems

Flicker is the modulation of a lamp’s light output caused by fluctuations of the mains voltage supply. Recent research has shown that fluctuations of short wavelength emissions are perceived to a higher extent and light flicker may have a huge influence on the well-being of end users. Prof. Georges Zissis, Head of Light & Matter Research Group at the LAPLACE Université de Toulouse presents and discusses the influence of driver topologies, research results, metrics and standards.

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LpR#53 Article, page 50
Light Flicker from LED Lighting Systems - An Urgent Problem to Solve by Prof. Georges Zissis, LAPLACE Université de Toulouse

LpR#54 Article, page 36
Reader's Opinion to article LpR#53 by Dr. Walter Werner, Werner Consulting

LED professional (sl) says: (on Mar 19, 2016 07:13 PM)
This is a comment from a reader to the article in LpR#54:

I’m a bit confused about the article about flicker.
On the one hand, there is a conclusion that says Flicker with higher frequency than 400Hz should be avoided. But the another conclusion says that flicker below 400Hz is not harmless.
 
So this very confusing. Or is there a wrong conclusion in the article? Thank you in advance for your feedback.
Walter Werner says: (on Mar 19, 2016 10:08 PM)
I am sorry for possible confusion. I have made the statement as clear as possible.

This is how it is: (above 100Hz:)
up to 400 Hz: There is some evidence that Flicker is possibly dangerous in some applications and should be avoided.

above 400 Hz: No research data available that allows to judge if a possible danger exists or not.
 
LED professional (sl) says: (on Mar 20, 2016 11:33 AM)
It would be interesting to know details about the VLC modulations (amplitudes and frequencies) and how they are fitting into the borders mentioned by Walter.
LED professional (sl) says: (on Mar 21, 2016 08:02 PM)
We've just added two charts about flicker from Philips. They have presented it at the L+B last week.
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