Posts Tagged ‘Flicker fusion frequency’

SUBLIMINAL FLICKER Part II: Fluorescent Lights and Flicker Sensitivity

March 9, 2011 Comments off


If you have incandescent light bulbs, I suggest you keep them… Light Bulb Freedom of Choice Act Oh yeah if you did not know, ALL CFLs are Made in China.  NOT ONE is produced in USA!

by Richard Conrad, Ph.D

Subliminal: below the threshold of conscious perception; inadequate to produce conscious awareness but able to evoke a response.

All types of fluorescent lights have some amount of flicker. Most of this flicker is invisible, at least to the conscious mind. Flicker is invisible when it consists of pulses or waves of light that repeat one after the other so rapidly that they appear to fuse together into steady light. Our flicker fusion frequency (the frequency above which we no longer consciously see flicker) ranges from about 25 to 55 Hz (Hz means times per second). Flicker fusion frequency varies with the person, with the intensity and color of the light, and also depends on where the light falls on the retina. Optic nerve signals proportional to flicker at frequencies far above the conscious flicker fusion frequency do reach our brain from the eye (as shown by EEG and other studies). Any invisibly flickering light that affects the brain is what I call Read more…