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The phrase "a narrow spectrum" is correct and usable in written English.
It can be used to describe a limited range of options, characteristics, or phenomena in various contexts, such as science, technology, or discussions about preferences.
Example: "The new medication targets a narrow spectrum of bacteria, making it less effective against a broader range of infections."
Alternatives: "a limited range" or "a restricted scope".
Exact(54)
"Plays have a narrow spectrum of investigation.
More troubling — or perhaps telling — is that her sample captures a narrow spectrum.
Traditional solar cells respond only to a narrow spectrum of sunlight, making them highly inefficient.
Establishment attitudes cover a narrow spectrum from survival being less important than growth to climate change being a hoax.
But the alliance has been based on a narrow spectrum of issues, such as opposition to abortion and gay marriage.
Micropatterning techniques involve soft lithography, which is laborious, expensive and restricted to a narrow spectrum of biomaterials.
Similar(6)
Resistance against methicillin, a narrow-spectrum penicillin derivative.
Cyclosporin A was originally introduced as a narrow-spectrum antifungal peptide produced by the mold, Tolypocladium nivenum (originally classified as Trichoderma polysporum and later as Tolypocladium inflatum), by aerobic fermentation.
If you need to use sprays, spot-treating heavily infested areas or using a narrow-spectrum insecticide that kills only the target pest and not the good guys is the best way to go.
Each plasmid contains a merRTPADE operon that confers a narrow-spectrum mercury resistance.
HT61 is a narrow-spectrum antibiotic which is only effective against Gram positive bacteria.
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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