We replaced all our profiles with ETC Source Four models some 3 years ago. All the 19 degrees reflectors has burned out. The silver coating is disintegrating and the insides of the lamps is full of this shavings that looks like glitter. (And we all know how we hate glitter on the stage) All the other models are fine. This will be a major cost to the theatre to replace all the reflectors. Does any one else have this problem.