Thanks Alien and Burd. Lighting = Mood and the best shows have the best 'artists' running the visual aspect. These types of lights suffer mostly from heat if they contain metal halide lamps, but road use and lack of servicing also hurts them. Older (cigarette) smoke filled venues deteriorated them the most, but modern smoke and haze also fills these fixtures with glycerine or glycol based atmospheric contamination.

I love firing up each fixture after refurb and putting it through its motions including pan, tilt, colour and gobo type.