Luminous (adjective)

1. Giving out light, especially steady light; shining.
2. Bright and radiating light.

Origin:

Late middle english: from latin luminosus, from lumen "light".

Examples:

1. The star was so luminous that it was visible from Earth.
2. The watch had a luminous dial, making it easy to read in the dark.
3. The painting was so luminous that it seemed to glow.
4. The room was painted with a luminous paint to make it bright.
5. The moon was luminous on the clear night sky.