glad you like it. I probably should have mentioned that the default master_brightness value assumes there are a lot of interferring objects in the scene. If you want to generate realistic lighting, you might have to drop that value to around 8 to 10.
I am planning on adding a feature where a "sphere" is created by the tool that you can map the input image to. This way, reflections in the scene could math the lighting. I also want to increase the color accuracy of the R8 and R7 light sets.