Definition
A small semiconductor device that produces light when an electric current passes through it. LEDs are valued in aviation for their low power draw, long service life, durability under vibration, and ability to produce bright, focused light from a compact source.
Plain English
A tiny electronic light that uses very little power and lasts a long time. Most modern flashlights, cockpit lights, and aircraft position lights use them.
Context Anchor
Seen in pilot equipment discussions, especially flashlights, headlamps, cockpit lighting, and night-flying gear.
Derivation
From three plain-English parts: 'light-emitting' means it gives off light, and 'diode' is an electronic component that allows current to flow in one direction. Knowing it is a diode explains why LEDs only work when wired the correct way around.
Why Pilots Care
LEDs provide bright, reliable illumination with low power draw and long service life, reducing electrical load and improving instrument readability at night.
Intuition Check
An LED is not just another name for any small bulb. It is an electronic light source, not a hot wire inside a glass bulb.
Example Sentence 1
The pilot clipped a red LED flashlight to her kneeboard so she could read the chart at night without ruining her night vision.
Example Sentence 2
The aircraft’s wingtip navigation lights use LEDs for better visibility and reduced battery drain.