2 sentences for 光彩 (guāng​cǎi — luster)

1. 他的眼神中发着坚定的光彩。

   tā de yǎn​shén zhōng fā zhe jiān​dìng de guāng​cǎi.

   There is a firm glow in his eyes.

   Source: Dong Chinese Dictionary

2. 这种名贵的丝绸在灯光下闪耀着柔和的光彩。

   zhè zhǒng míng​guì de sī​chóu zài dēng​guāng xià shǎn​yào zhe róu​hé de guāng​cǎi.

   This precious silk shines with a soft luster under the lights.

   Source: Dong Chinese Dictionary