[@Divinity]
There are many types of light, but not all electromagnetic phenomena are light. For example, the forces within atoms caused by electromagnetism can't be logically classified as light. Therefore controlling light grants you control of a specific electromagnetic phenomenon, not control over the entire spectrum.

Although you do make a good case for why electricity control also means light control, meaning that I can add that to my repertoire of bullshit things an electricity-based character could do.