I’m pretty new to UE, but if you’re using UE5 and Lumen, I believe the answer is no you can’t do that; instead you should add (1) a mesh with emissive material and (2) a light, so that you can control the color of the mesh surface independently from the color of the light it emanates. Related convo: Emissive material boost for lumen - #5 by topherhunt