Textures cannot light objects, they only glow. You could try to get a more realistic effect by adding a generic bulb, behind a translucent surface (possibly with an alpha channel) and set Cast shadows of the object to No.

Hmm, I see. I’ve used the «translusent method» before to create the illution of a translusent fabric like a peppers ghost scrim. But in this case I need the objects that should emit/bounce light to be solid and not translucent.

Is it perhaps possible in some way to make the physical body of a fixture in capture invisible in the render, but keep the light emited from it visible?

If so, I could «hide» some led-panels to get the soft light from the objects and projector screen, that I need