Usage patterns 〈 物もの 〉 が 光こう 彩さい を 放はな つ for something to radiate brilliance/shine dazzlingly
The jewel radiated a dazzling brilliance.
光こう 彩さい を 帯お びる to take on a lustrous, brilliant quality
Catching the sunset, the lake's surface took on a shimmering brilliance.
Related words 輝き is the common, everyday word for brightness or radiance, while 光彩 is a more literary term implying dazzling, colorful brilliance.
光輝 and 光彩 are both literary words for radiant brilliance, but 光輝 leans toward describing glorious, honorable brightness rather than dazzling color.
光沢 refers to gloss or sheen on a surface, whereas 光彩 suggests a more radiant, luminous quality rather than mere surface shine.
Don't confuse with 虹彩 (same reading こうさい ) means the iris of the eye, a completely different word from 光彩 , which means brilliance or luster.
光彩 refers specifically to radiant light or coloring (like a gem's sparkle), while 精彩 more broadly covers vividness or liveliness, including non-visual senses like energy in performance.
Etymology Composed of 光 (light) and 彩 (coloring, brilliance). The combination conveys a sense of radiant, colorful light.
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