according to Krisna what is the universal light

As I understand it Krishna is the personification of the life-creating Divine Light, kind of like Christ is the personification of God's light in the Bible.

Brother

Chapter 7 Text 8

I am the taste of water, the light of the sun and the moon, the syllable om in the Vedic mantras; I am the sound in ether and ability in man.

Krishna is the Universal Light