Looking at P12 in another window and I no longer even see "light Emitter" as an option. I don't really recall it since Poser Pro 2012. Mesh light in P12 is as easy as enabling a value above zero in Ambient_Value when using the PoserSurface node; or enabling a value higher than zero in EmissionStrength when using the PhysicalSurface node. As I look at P11 in yet another window I do no see the light emitter option any longer there either. Mesh lighting would be enabled the same way in P11 as mentioned for P12 when rendering with Superfly.