Plain English Meaning
A light that keeps flashing or pulsing on and off quickly. At night or in cloud, this kind of flashing inside or near the cockpit can make a pilot feel dizzy, disoriented, or sick.
Full Definition
A light source that rapidly and repeatedly varies in intensity, used in night-vision discussions as a known cause of disorientation, vertigo, or nausea in pilots, particularly when produced by a propeller, rotor blade, or anti-collision strobe passing through cockpit lighting or external light at night or in clouds.
Context Anchor
Encountered during night flying, especially with cockpit lighting, warning lights, rotating beacons, , or other lights seen through the .