How to turn an object into a light source in Rhino software. It is very simple. First, we select the grouped topic. Then we select the mesh light option. After that it becomes a light source. You can change the name of the mesh light through the lights option. We open the frame buffer. We take a rendering test. We edit the lights in the light mix list. Then, as you can see, our halogen turned on. If you want the desired object to be removed from the light source mode, just right-click on the light mesh option.