Whom did Sri Bhagavadpada refer to?

यो ब्रह्माणं विदधाति

पूर्वं यो वै वेदांश्च प्रहिणोति तस्मै

तं ह देवमात्मबुद्धिप्रकाशं

मुमुक्षुर्वै शरणमहं प्रपद्ये

Yo BrahmaNam vidadhaati

poorvam yO vai vEdaamshca prahiNOti tasmai

taM ha dEvamaatmabuddhiprakaashaM

mumukshurvai sharaNamahaM prapradyE

Shloka Meaning:

Which has specially created this universe

Which beholds the Vedas in it

To that, I bow deeply and willing to give this

Intelligent Light of Godly Soul for salvation

By Saying so, Sri Sri Bhagavadpada is talking about the great light which controls the senses and everything in this Universe. He says I bow to that light which has created this and I would give away the light that it has given to me as a Soul in order to reach the salvation. This shloka was mentioned by him before the commencement of his Brahmasutra Bhashyam.