Donnie, I just tried the Master lights and it works fine , may not be totally flexible but playing with this feature for a few minutes makes me wonder why I haven't used it before. Anyways here is what I did. Group all the lights that you want to change using the "Master Light" feature into a single group. Then select this group then look in Edit menue at the top of the screen then select "master light" from this menue. You can change the settings to effect only certain types of lights,or all the lights in your group. (bulb,distant etc. ) Go back to assembly room and all your lights are updated. Thanks for your comment about the lights ,now I think I am going to be using this feature in the future. Mike