Today I'd like to talk about the meaning of that chant. Obviously I don't speak Pali. But I don't think that what the Buddha was saying here at all. He's not saying you have a light inside you, he's saying you ARE light. Light is something we literally can't grasp, it's insubstantial, without boundary.
Light then is formlessness, and boundaryless, and in itself empty of particularity.
So to assert the identity of self and light is to assert something that deeply challenges our picture of who we are. Trust, take refuge in THIS realization of the self as light. We traditionally think of Buddhism as fundamentally concerned with the problem of suffering and how to end it. We all come to practice seeking some refuge from our suffering. The dharma is light.