| 1 | 光 | 光 | guāng | guang1 | light; ray; Classifiers: 道 ; bright; only; merely; to use up | | |
| 2 | 光线 | 光線 | guāng xiàn | guang1 xian4 | light ray; Classifiers: 条 ; light; illumination; lighting (for a photograph) | | |
| 3 | 光辉 | 光輝 | guāng huī | guang1 hui1 | radiance; glory; brilliant; magnificent | | |
| 4 | 光谱 | 光譜 | guāng pǔ | guang1 pu3 | spectrum | | |
| 5 | 光合作用 | 光合作用 | guāng hé zuò yòng | guang1 he2 zuo4 yong4 | photosynthesis | | |
| 6 | 光学 | 光學 | guāng xué | guang1 xue2 | optics; optical (instrument) | | |
| 7 | 光明 | 光明 | guāng míng | guang1 ming2 | light; radiance; (fig.) bright (prospects etc); openhearted | | |
| 8 | 光荣 | 光榮 | guāng róng | guang1 rong2 | honor and glory; glorious | | |
| 9 | 光照 | 光照 | guāng zhào | guang1 zhao4 | illumination | | |
| 10 | 光芒 | 光芒 | guāng máng | guang1 mang2 | rays of light; brilliant rays; radiance | | |
| 11 | 光源 | 光源 | guāng yuán | guang1 yuan2 | light source | | |
| 12 | 光子 | 光子 | guāng zǐ | guang1 zi3 | photon (particle physics) | | |
| 13 | 光电 | 光電 | guāng diàn | guang1 dian4 | photoelectric | | |
| 14 | 光景 | 光景 | guāng jǐng | guang1 jing3 | circumstances; scene; about; probably | | |
| 15 | 光泽 | 光澤 | guāng zé | guang1 ze2 | Guangze county in Nanping 南平 Fujian; luster; gloss | | |
| 16 | 光彩 | 光彩 | guāng cǎi | guang1 cai3 | luster; splendor; radiance; brilliance | | |
| 17 | 光速 | 光速 | guāng sù | guang1 su4 | the speed of light | | |
| 18 | 光波 | 光波 | guāng bō | guang1 bo1 | light wave | | |
| 19 | 光度 | 光度 | guāng dù | guang1 du4 | luminosity | | |
| 20 | 光绪 | 光緒 | guāng xù | Guang1 xu4 | reign name of penultimate Qing emperor Guangxu or Guang-hsu (1875-1908) | | |
| 21 | 光能 | 光能 | guāng néng | guang1 neng2 | light energy (e.g. solar) | | |
| 22 | 光是 | 光是 | guāng shì | guang1 shi4 | solely; just | | |
| 23 | 光临 | 光臨 | guāng lín | guang1 lin2 | (formal) to honor with one's presence; to attend | | |
| 24 | 光年 | 光年 | guāng nián | guang1 nian2 | light-year | | |
| 25 | 光束 | 光束 | guāng shù | guang1 shu4 | light beam | | |