Apparatus is provided for projecting light to simulate flames on a screen for use in an electric fireplace with an imitation flame display. The apparatus comprises a hollow cylinder enclosing an interior region, the cylinder being rotatable about an axis of the cylinder and having a sidewall with an exterior surface and a non-reflective interior surface with apertures through the sidewall. A light source in the interior region is operated to cause light to be transmitted through the apertures onto the screen to simulate moving flames when the cylinder is rotated. This arrangement provides an improved imitation flame display on the screen. When incorporated into an electric fireplace, the apparatus provides a pleasing illusion of active, dancing flames adjacent an artificial log set.