Keep it simple. There seems to be great confusion about the nature of light. Actually, it is pretty simple. Think of a basic atom. You have a nucleus and electrons spinning around it.
Electrons are the stuff that makes electricity.
They have an electrical charge. Normally, the atom is a fairly balanced system. But, if you put energy into this system, you can pump it up. For instance, if you send electricity in, the electrons of the electricity bump up against the electrons of the atom. As they collide its like a billiard ball hitting another billiard ball.