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There is no difference between "luminous" and "illuminous." Both words are not standard English terms and may not be recognized in a dictionary. The correct term is "luminous," which means emitting or reflecting light.
One is luminous and the other is illuminated. If you know what these words mean, that should be enough.
A luminous body 'glows' on it's own (a firefly) while an illuminated body is seen with light. (a flash light at night on a book).
Phosphorescent light emission occurs when a material absorbs and stores energy from a light source, then slowly releases it over time. Bioluminescent light emission, on the other hand, is produced by living organisms through a chemical reaction within their bodies.
-A non-luminous flame is when the air hole of the Bunsen burner is closed but a luminous flame is produced when the air hole is opened.-A luminous flame has an outer of orange colour and an inner of blue. A non-luminous flame has an outer of blue and an inner of orange.-A luminous flame produces soot while a non-luminous does not produce soot.-A luminous flame is weak and unsteady. A non-luminous flame is strong and steady.-A non-luminous flame is very hot while a luminous flame is not too hot.
A star generates energy, including light, which it emits into space, i.e. it is luminous. A planet can only be seen because it reflects the Sun's light, i.e. it is non-luminous.
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An illuminated object reflects light that came from somewhere else. A luminous object emitts its own light.
a star is a luminous pointed figure that shows up at night. A diamond rating is facts and information, cut, clarity, color, and more things on an diamond.
A luminous source produces its own light, like the sun or a light bulb. An illuminated source does not produce light but reflects light from a luminous source, such as the moon reflecting sunlight.
Illuminance is another word for 'luminous-flux density', which describes the intensity of the luminous flux hitting a surface. Its SI unit of measurement is the lux, which is a special name given to a lumen per square metre. Luminance is a measure of the intensity of the light reflected by a surface. Its SI unit of measurement is the candela per square metre.
Luminous and non-luminous objects are both physical entities that occupy space and have mass. However, the key difference lies in their ability to emit light. Luminous objects, such as the sun or a light bulb, generate their own light, while non-luminous objects, like the moon or a book, reflect light from another source. Both types of objects play important roles in our understanding of physics and the natural world.