Usage Note
Lumineux describes both physical brightness (un écran lumineux = a bright screen) and figurative clarity (une idée lumineuse = a brilliant idea). The feminine form is lumineuse. The noun lumière (light) is the root, and luminosité is the derived noun meaning luminosity or brightness level, often used in photography and screen settings.
Examples
"Son appartement est très lumineux."
Natural Translation
Her apartment is very bright.
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