Hán Guāng 含光 (fl. mid-8th c.) — one of the six principal disciples (六哲 / 六大弟子) of Amoghavajra 不空 in the Tang Esoteric (Tángmì 唐密) school. Together with Huì-guǒ 惠果, Huì-lǎng 慧朗, Tán-zhēn 曇貞, Yuán-jiǎo 元皎, and Jué-chāo 覺超, he received the full Vajraśekhara/Garbhadhātu transmission directly from Bù-kōng. He served as Bù-kōng’s emissary to Mt. Wǔtái 五臺山, where he was instrumental in the establishment of the Jīn-gé-sì 金閣寺 (Golden Pavilion) and of the cult of Mañjuśrī as the imperial guardian of the Tang. The Esoteric chronicler Zàn-níng 贊寧 (in the Sòng Gāosēng-zhuàn) lists him among Bù-kōng’s foremost transmitters and describes his oral teaching as the source for several of the Vināyaka-cycle ritual manuals — notably KR6j0504 (T1273), recorded by him as a digest of the secret meaning, and KR6j0505 (T1274), compiled by his disciple Jǐng-sè 憬瑟 from his oral transmission.
Source: DILA Buddhist Person Authority A001396; Sòng Gāosēngzhuàn 宋高僧傳 fasc. 27 (T50n2061); Chou Yi-liang, “Tantrism in China,” Harvard Journal of Asiatic Studies 8 (1945): 241–332; Geoffrey Goble, Chinese Esoteric Buddhism: Amoghavajra, the Ruling Elite, and the Emergence of a Tradition (Columbia UP, 2019).