Light is not excited electrons. Light can be produced by excited electrons, but it can also be produced by excitations of anything that has a charge. And even when light is produced by electrons, the light itself still isn’t electrons: The electromagnetic field which is the light can travel far, far away from the electron. When we see light from the Andromeda Galaxy, we’re seeing photons which were emitted by some electron or another in that galaxy, but the electrons are still there, even though the photons made it all the way to us.