Actually, since an LED (light emitting diode) only allows current in one direction the flicker rate would be half of what this person suggested. Much closer to the natural human frequencies, brain waves, Gamma waves, high-level cognition, 30–100 Hz. Heartbeat, 60-70 times a minute, etc. I don’t know if this is coincidence, human nature expressing itself subliminally or an intentional disruption. Regardless of the circumstances, it is well documented that non-natural light is disruptive to our bodies in various ways.