Sorry Paul, I took for granted that Revit studio lights were not relevant as there was no geometry to use as an emitter surface.
Also I have been adding geometry to some light fittings to simulate light bulbs that emit rather than glass diffusers, etc.
We don't have planes in Revit as such, so a quick and dirty way is to define special 'screen' wall types to add emitter materials, or to create parametric generic or entourage families of thin panels. Of course all of these will show up on your Revit model. This is where the Proxy objects come in to their own. A family component consisting of a spot, cross, etc can be substituted in the viewport with a Proxy object. The use of Proxy objects works well because you can have a graphically pleasing 3D model in your Revit project and replace it with a high-poly OBJ as a Proxy in your rendering. This also gives you the benefit of keeping the Revit Project file size down.
In the crude Revit project for beta testing below the crosses are replaced by Proxy objects of the boardroom furniture, plant and overhead projector in the Plugin. A curved wall was added with the cityscape image set in the material. You have to be a bit creative with the texture mapping in Revit. The material in the Plugin is set as an Emitter. Using a Texture Environment with an HDRI image in the Plugin is usually a better option.