luminous

lu-mi-nous/ˈluːmɪnəs/US

adjective

1
Giving off or reflecting light; glowing.
The dial stays luminous for hours after sunset.
2
Strikingly clear and illuminating, as of an explanation.

From Latin luminosus, "full of light", from lumen ("light").

Also useful for “luminous”:Unscrambler— Rearrange the letters in “luminous”