Thanks Brian. That seems like a promising approach. In my model (attached) the emissive light is also coming from the bottom of the disc, so it is a bit more challenging. (It’s easier to see the difference with just one table and light, so the light from the other doesn’t bleed in.)
Adding a small panel light mostly just brightens the floor, without changing the darkness of the shadow.
Adding a large panel light does lighten the outside of the shadow, but creates a double shadow which isn’t right for what it supposed to look like one light source.
Raising the light up higher creates another double shadow, so that doesn’t work.
Adding a giant panel light is the most promising so far, as it is so big it illuminates the floor under the table.
However it is still far brighter than the emissive light by itself, so I will play with intensity settings and likely still need Photoshop work at the end.
My model: Light-shadow-example.3dm (3.0 MB)
emissive plus small panel light
emissive plus large panel (double shadow)
emissive plus giant panel
light panel size comparison