Not capable of producing light, but can be capable of reflecting light from another source.(adjective)
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Use "non-luminous" in a sentence
"A dab of real oil paint was given to become the tiny lights in the tiny windows of the tiny house of the print, so that the luminous quality of real oil paint, relative to the non-luminous quality of print, made the dabs of paint look as if there were real tiny lights actually lit up in the "painting's" windows."
"But the “kryptonite” in Serbia is a white, opaque, non-luminous, powdery substance, not a green, glowing, crystalline substance, so other than the composition made up in the movie which has nothing to do with the amazingly-ubiquitous remains of the planet Krypton, they have nothing whatsoever in common."
"Colour of a non-luminous object: colour sensation caused by a non-luminous object."