Hmmm.  Well, the standard plex is a 60% transparency ‘White Light’. That means it is 40% opaque. The fixture itself is designed to spread 120º and set to a middle Kelvin setting (The color temperature from 2700 warm incandescent to 3,500 household florescent). So changing the color or translucence of your plex introduces a variety of new variables. So, basically, if you want to experiment with various plex colors, such as amber, you can slip out one of the plex panels and take it to a Tap Plastics store and have them make 4 duplicate sizes in the color of your choice and see how it looks.   But before doing to, be sure to test the various brightness settings on the Dimmer button.