I learned the meaning of mute is "characterized by an absence of sound; quiet" from Oxford Dictionaries Online. From the above meaning I understand mute is an adjective or attribute which is applicable and related to sound. However I have come across the phrase muted light from the below excerpt which is from "The Grave Yard Book" by Neil Gaiman.
There was moon light, and there were streetlights, but the fog is stifled every thing, muted light and muffled sound and made the night shadowy and treacherous.
By that meaning I don't understand how mute is applicable to "light". I can not imagine what muted light would be. Can mute be applicable to the things which are related to light?