The difference between Luminous and Radiant
When used as adjectives, luminous means emitting light, whereas radiant means radiating light and/or heat.
Radiant is also noun with the meaning: a point source from which radiation is emitted.
check bellow for the other definitions of Luminous and Radiant
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Luminous as an adjective:
emitting light; glowing brightly
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Luminous as an adjective:
brightly illuminated
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Radiant as an adjective:
Radiating light and/or heat.
Examples:
"the radiant sun"
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Radiant as an adjective:
Emitted as radiation.
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Radiant as an adjective:
Beaming with vivacity and happiness.
Examples:
"a radiant face"
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Radiant as an adjective:
Emitting or proceeding as if from a center.
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Radiant as an adjective (heraldry):
Giving off rays; said of a bearing.
Examples:
"the sun radiant;  a crown radiant'"
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Radiant as an adjective (botany):
Having a ray-like appearance, like the large marginal flowers of certain umbelliferous plants; said also of the cluster which has such marginal flowers.
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Radiant as a noun:
A point source from which radiation is emitted.
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Radiant as a noun (astronomy):
The apparent origin, in the night sky, of a meteor shower.
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Radiant as a noun (geometry):
A straight line proceeding from a given point, or fixed pole, about which it is conceived to revolve.