Adding light to a table?

I added the light resource at Warehouse>Light. I also vertex painted the mesh.

The light does work, but it does not affect/light up the table itself.

I took a look at the shaders, changed it the same way as it is for a light object but nothing changed either.

I know it's easier to close an already existing lamp, but for this object in specific it won't be possible because of the amout of meshes I'll need.

Does anyone know what else could be missing?