Look up Layers in the manual. You can assign each level to a named Layer, and assign its lights to that same Layer. I haven't tried this particular scenario, but it should work properly.
You can colorize elements further. Split into individual layers and/or use mask layers. Then use use color adjustment clip layer(s) of your choice. Couple of themes from me:
Update 3: Ground layer has been updated with shadows and mountains,
stars and moon have been added to upper layer. Final adjustments to layer
position on model have been made
Yoooo I'm unemployed! If you got a job for me, hit me up!! BUT I've had some ideas for a fun Looney Tunes inspired Space Western which would be an arena shooter. This is what I got so far... Been starting on some kits for the buildings. Not nearly finished but I've been having fun with the blockout. This is going to be a…