Types of Flickering

There are two types of flickering with lights – visible flicker and invisible flicker.

Visible Flicker

Obviously visible flicker is the one our eyes can see, which is when the light output from a given source changes rapidly. There are health concerns with visible flickering. 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.

Invisible Flicker

Invisible flicker is present but we cannot see. It is just as much of a health problem. The symptoms include dizziness, eyestrain, headaches, migraines, impaired thought, and other general sick-feeling symptoms.

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