It is the flicker that is present but we cannot see. Invisible flicker is just as much of a problem if not more. With 1 in 4000 people suffering photosensitive epilepsy and many more who have not been diagnosed, this has become a public safety issue. Short-term exposure to frequencies in the 3Hz to 70Hz range are associated with epileptic seizures, with the highest possibility of occurrence being in the 15Hz to 20Hz range. There are health concerns with visible flickering. It is considered that anything below a frequency of 100Hz can be seen.

Obviously visible flicker is the one our eyes can see, which is when the light output from a given source changes rapidly. There are two types of flickering with lights – visible flicker and invisible flicker. What are the causes of this, and are there solutions? Types of Flickering Despite flickering being less present in LED than with fluorescent systems, it is certainly still a factor.

With fluorescent lighting gradually being displaced in favor of LED, many thought the days of dealing with flickering lights were over.

Lightburn camera flickering