These are a bit different than expected. So I misread 1.6 feet = 19.2 inches NOT 1 ft 6 inches. NBD (they ended up measuring 19.5 inches in reality) 
Color - they are styrofoam - expect that bit of shine like a take out box. Doesn’t really look bad at the ceiling level.
Application/installation- don’t trust that video 100% we used the lathes (ferring strips) the middles sag a bit just having the edges along 2 sides glued. We ended up using our pneumatic nail gun with finish nails in the corners. They were light weight enough that this 5’1” F did it with my husband who currently only has use of one hand. They are pretty easy to cut for the light and the edges