। ॥ ५३४ ॥
In plain words
Everything in this universe is lit up by his light, the way the world is lit by the sun. So what could possibly shine a light on him? Nothing that isn't him is even real enough to try.
Close to the Sanskrit
By whose radiance the whole world shines, as it shines by the sun—what unreal, insubstantial non-Self object could possibly illumine that Self?