Answer: emitting or reflecting light
Luminous sources of light are objects that emit light due to their own energy, like the sun or a light bulb. Non-luminous sources of light are objects that reflect light from luminous sources without emitting light themselves, like the moon or a mirror.
"Luminous" means emitting light (conveniently measured in units known as Lumens). Synonym would most often be "glowing".
It is luminous
Luminous.
It's non-luminous
At first light it DOES sound a bit confusing. First, the definition of the term 'NON-LUMINOUS'; 'Not capable of PRODUCING light but can be capable of REFLECTING light from another source'. For instance, our MOON is NON-LUMINOUS as it REFLECTS light from the Sun. The SUN is LUMINOUS as it produces light that is REFLECTED off the surface of the moon. And so, LUMINOUS means capable of PRODUCING light. Now closely examine your flashlight. The BATTERIES produce electrical energy which is transferred to the BULB which emits light, thus LUMINOUS. The tiny little BULB emits quite a lot of light for its small size. However, the bulb is contained within a concave silvered cone which REFLECTS,(NON-LUMINOUS) gathers and channels the emitted light from the BULB (LUMINOUS) into a BEAM which ILLUMINATES whatever you are pointing the flashlight at. Our cameras would be just paperweights if there were no NON-LUMINOUS surfaces for the light to REFLECT off of, back into the camera lens, onto the 'plate' thus etching the image. For example, take a photograph in the dark without the flash and what do you get. No LUMINOUS, no NON-LUMINOUS. And so there we have LUMINOUS and NON-LUMINOUS, ILLUMINATING our lives. Enjoy! :)
Luminous could also mean 'full of light or illuminated'. For example: luminous hands of a clock. Here, luminous denotes shiny or that give light. In the example: luminous room; luminous indicates well-lighted. Something that is clear or easy to understand is also termed luminous. Fro example: luminous prose or luminous theory. Luminous could also mean inspiring, intelligent, or enlightened.
A luminous atmospheric phenomenon appearing as streamers or bands of light sometimes visible in the night sky in northern or southern regions of the earth.
luminous is correct
No, that is an incorrect definition. Luminous means creating its own light. Non-luminous just means not creating its own light. For instance the Moon is non-luminous. It *does* reflect light. It just does not create its own. Fabric also reflects light. It does not reflect it the same way a mirror does (mostly the light it reflects is scattered) but the fact that you can see the fabric even though it is not emitting light itself means it is reflecting light emitted from other objects. However, it is still non-luminous because it does not create its own light.
luminous means that it gives light
It gives off light. That is what luminous means.