It is also explained in the Gītā that impersonal Brahman is also subordinate to the complete Supreme Person (brahmaṇo hi pratiṣṭhāham). Brahman is more explicitly explained in the Brahma-sūtra to be like the rays of the sunshine. The impersonal Brahman is the shining rays of the Supreme Personality of Godhead. Impersonal Brahman is incomplete realization of the absolute whole, and so also is the conception of Paramātmā. In the Fifteenth Chapter it shall be seen that the Supreme Personality of Godhead, Puruṣottama, is above both impersonal Brahman and the partial realization of Paramātmā.
Shining (BG and SB)
Bhagavad-gita As It Is
BG Preface and Introduction
BG Chapters 7 - 12
BG 10.11, Translation:
To show them special mercy, I, dwelling in their hearts, destroy with the shining lamp of knowledge the darkness born of ignorance.
BG 10.21, Purport:
There are twelve Ādityas, of which Kṛṣṇa is the principal. Among all the luminaries shining in the sky, the sun is the chief, and in the Brahma-saṁhitā the sun is accepted as the glowing eye of the Supreme Lord. There are fifty varieties of wind blowing in space, and of these winds the controlling deity, Marīci, represents Kṛṣṇa.