Thank you for responding.
Your Checkerboard recommendation is creative, but I am working from what will be a delivered piece of Content. As such, I have mapped my Content Area to the Rectangular Light. (See attachment)(the black area is alpha in the Compo feeding the Content Map)
Here is my Project breakdown; I am in a Processor I have labeled ‘Pre-Viz’ that my 3D assets and lights live in. I have also tried putting my LED 3D geometry in my Stage, and I have tried both the Stage Preview and the Stage Simulation with slightly different results in brightness. Neither the Stage Preview or the Stage Simulation offer the same emissive effect that Rectangular Lights do. (see the attached image)
The Stage Simulation does work better than the Stage Preview for screen brightness (thank you for that recommendation), but it does not reflect on the other mesh objects as dynamically as the Rectangular Light solution. I was hoping there would be a way to Mask/Boole the light so that I can preserve the deadspace between the LED bars without creating 160 (give or take) individually mapped Rectangular Lights. So far, the Alpha in my Compo comes through as black, and I am unable to add any kind of mask (that I know of) to the Rectangular Lights.