Not all inhabitants of bodies are beings of light. One would hope, one would admire, one would pray and enjoy all inhabitants of bodies being enlightened, that is not the case. Yes, the energy you speak of, as you call light, is the source. The source of light is light, for light comes from thought and thought creates all. To use the energy from the source, as thought creates the light which would protect you, your thought is the actor creating the protection as you give the direction of the thought to energy.
Energy then performs the function.
You, then are protected, by the function of energy created by thought acting upon the protection of your physical body. What ever words you use. It is the thought that gives direction. Remember that light is the energy source and thought is the creator. I speak of Spirit of Light as a thing that is in specifics.