I have a sign on a model, in real life it could be lit from within, with fluorescent lamps. Lit from outside with fluorescent lamps shining on it.
Here is what I tried so far, an 8' fluorescent ies from below, and above. I get bright spots that look like point lights 8 ft apart, not right.
I tired a emitter material on the surface of the sign, long render time. I tried a lampshade material (which I really do not know how to use) long render time no light. Subsurface scattering (wax) no light output. I really need a fast simple solution. Along the same lines perhaps some pointers on using long lamps and ies. The 2x4 troffers I used inside this same model look great, using the twilight light components.
I will keep trying things on my own but some ideas would be of great help.