Not so sure why not. Every single article I've read on visible light describes it quite specifically as an EM wave, with a period/frequency, and a corresponding amplitude. The fact that it has associated with it a particle interpretation should not invalidate its wave function.
In general...
So I was pondering an electron jumping to a lower energy state and releasing some light. And then I became stuck trying to figure out how long the light stays on for. (ie, how many waves of light will the "event" cause.) If it's as simple as it looks, it would make sense that one jump would...