This is a repost since part of the post got chopped.

 

 Tony Durizzi's IVP was built earlier and had the same ice light as this.
  There was a piece of plexiglass bonded over the top to protect it. It worked
  well, but I think the surface began to crack around it if memory serves.
  Could have been due to flexure.
 
  John Barrett

 

The subsequent owner of the aircraft had the lights removed during a repaint
of the entire airframe (I worked on the re-paint).  The lights were not in
very good condition.  There were cracks and the plexiglass type lenses were
scratched and foggy looking.
  
Gary Edwards