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"Strobe" gives plenty light intermittently.
sun
I think you are looking for the word Luminescent, as in the lightbulb was luminescent Lumin - meaning light escent - meaning giving or displaying Luminescent - something that gives out light
A black hole
fire
To light up something or to illustrate a serious book.
luminous
"As light as a feather" is an expression used to describe something that is very light in weight. It conveys the idea that something is easy to carry or move because of its lightness.
I have seen this phrase used recently. It means that the symbolism something has is shedding a light on what is going on.
i think luminous means when something gives off light and non-luminous means when something does not give off light.
Assuming that you mean light in the visible spectrum, it would mean that the thing is giving of radiation that is in the visible light spectrum