Malbim Ayelet HaShachar Klal 483
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מלת "כהה" בא על דבר שנחלש כחו. ובנגעים בא על כהיות המראה. ויצויר שנחלש המראה לגמרי או שנחלש קצת ממראה עזה לכהה (סימן סד).
The word כהה (dim) refers to an object that is weakened in its strength. And with respect to plagues, it means dim in appearance. And it is depicted as that which is weak in appearance, either completely or slightly, from an intense appearance to a dim appearance.
ובמה שכתב "והנה כֵהָה הנגע" – בפעל, לא בשם "כֵהֶה" – מורה שנחלש קצת (סימן קעג)
And when it is written והנה כֵהָה הנגע (behold, the plague be dim)⁷⁰⁴, it is with a verb, not with the noun כֵהֶה; this teaches that it is slightly weak.
footnotes: ⁷⁰⁴ Leviticus 13:56.