Definition
A cockpit lighting setting that turns the instrument panel and interior lights to their brightest white setting. It is used during flight near or in thunderstorms to reduce the temporary blindness a pilot can experience when a sudden lightning flash floods a dim cockpit.
Plain English
A way of cranking the cockpit lights all the way up so that when lightning flashes outside, your eyes are not shocked from darkness into glare and back again.
Context Anchor
Seen during night or instrument flying when a pilot notices lightning flashes ahead, off to the side, or inside clouds along the route or near an approach area.
Why Pilots Care
Activating these lights reduces collision risk by making the aircraft more conspicuous when visibility is poor near convective weather.
Analogy
It is like turning on every light in a room before someone takes a flash photograph. The flash still happens, but your eyes barely notice it because they are already adjusted to bright light.
Grounding Statement
If the sky ahead is flashing, the pilot should picture a powerful storm area, not just harmless distant light.
Intuition Check
Do not read “thunderstorm lights” as a lighting system on the ground. Here, “lights” means lightning flashes produced by the storm.
Example Sentence 1
Before entering the area of buildups at night, the captain turned the thunderstorm lights full on to protect against flash blindness.
Example Sentence 2
During the IFR thunderstorm briefing the instructor emphasized using the thunderstorm lights for added conspicuity.