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Discover LudwigThe phrase "bright line" is correct and usable in written English.
"Bright line" is an idiomatic phrase that usually refers to a clear and obvious distinction. For example, you could say, "The law outlined a bright line between what was considered a felony and what was considered a misdemeanor."
Dictionary
bright line
noun
A clear distinction in the context of a legal or moral judgment.
Exact(53)
Such a "bright line" I.Q.
Alas, there is no universal bright line.
"There's no bright line," Ms. Fisher said.
It crosses a line, a bright line.
But there isn't a clear and bright line here.
That is the bright line that protects our freedom.
Similar(7)
The court drew a bright-line rule at 18.
Such a pattern is called an emission, or bright-line, spectrum.
For infants above the age of 4, there is no bright-line rule".
Second-best is to introduce some bright-line rules into this monstrosity.
"I still believe the optimum, the bright-line test, is a total prohibition.
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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