I saw a show at a local theatre over the weekend that used a few 14" scoops as house lights, not uncommon. However, the method in which the gelled the scoop was unique. They took some sheets of the plastic sheet material used to diffuse the light from tubular fluorescent drop ceiling fixtures, cut it into squares and put it into the gel frame holder on the scoops. They looked to have been there for quite some time, so I assume heat hasn't been an issue in their case. I liked the look as a cheap way to "dress up" scoops as house lights.