This divine radiance is called tejas in Sanskrit, and Sri Krishna is telling us here that this same light is within everyone, and it is the same radiance in the sun, in the stars, as in us all.
Easwaran identifies Tejas as the Sanskrit name for the divine luminosity that kundalinī becomes after its completed descent, equating it with the universal inner light declared by Krishna to pervade all beings and all cosmic bodies.
, The Bhagavad Gita for Daily Living: A Verse-by-Verse Commentary, 1975thesis