Newbie question: Creating spotligth effect on a stage

I have some cut out pngs on a black background, like say, puppets on a stage. I want to light them one by one, using a spotlight.

Thanks for any answer on how to do this.

Like this?

Spotlight.sifz (2.9 KB)

Thanks, but not exactly. Like we are sitting in the auditorium, and the light source is behind us.

I tried using a gradient layer, but the spotlight circle goes from black to white, not black to transparent.