Emissive Decals?

Hello all,

I’m trying to create a detail with emissivity to simulate the light of a video projector. I want to use the decal as a placeholder for the ‘projected’ image, and I want it to bounce light back into the room the way that a video projector does.

When I try adding a constant or value to control the emissive brightness as I would on a regular material, I’m getting no light in the scene.

Blueprint screenshot attached.

Any ideas are much appreciated!