my question deals with variable light transmission (VLT)
This depends on the color of the glass (clear, dark green, etc) and the thickness. If you don't believe me, look through a window, and then try to look through an empty wine bottle.....
The clearest uncoated optical glass has 4% losses due to reflection on its surface. We can bring this up to 99.9% with dielectric coating. The losses due to absorption in ultra-pure optical fibers are extremely low.
it depends upon the color of light and the color of glass.. if the color of light is absorbed by the glass, little percentage of light will pass through coz it was already absorbed by the glass and the color which are present in the glass are the only colors that are reflected by the glass and then the only percentage of light that will pass..for ex. red light passing black glass, theres no light that can pass because black is absence of all colors..therefore the red light was being absorbed by the black glass without any light reflected..we can just simply observe that only the heat or what we call light energy is the thing that can be transmitted lesser compared to the light passing through white glass..so, the answer of the question will depends upon the glass, the light and the kind of glass..diamond form of glass will store light inside and will not allow all light to pass through. so, the percentage of light transmission will lessen ;-)
