What are these airport lights, and what are they used for? 🛬 🚥

What are these airport lights, and what are they used for? 🛬 🚥

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[philbrown]

Papi, lights. They use a fresnel lens to show the glide slope. The idea is if you see two white and two red lights your on the glide slope.

[hsarman]

PAPI lights, a precision approach path indicator is a system of lights on the side of an airport runway threshold that provides visual descent guidance information during final approach.

philbrown is correct

[Croctalk]

These lights are for where the back gear touchdown

[Arree]

Taking wild guess that it's something to do with the wing as plane descends.