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"red light" is correct and usable in written English.
You can use it as a figurative expression to describe a warning to stop or pause. For example, "The supervisor gave us a red light on the project until we had more reliable evidence."
Dictionary
red light
noun
A warning light, especially as a traffic signal indicating ‘stop'.
synonyms
Exact(48)
That red light?
Stupidest red light ever.
Stuck at a red light?
And a red light".
Red light running.
"At a red light".
Similar(12)
Infra-red light.
Radiation is simply infra-red light.
Why red-light districts?
A red-light camera.
It has red-light districts.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com