When psychedelia fell out of fashion from about 1970 onwards, elevated platforms of the type conventionally used for roof maintenance in high buildings were brought on tour and filled with lighting equipment to be raised and lowered during performances. Following Roger Waters' departure in 1985, the Pink Floyd light show reached a dazzling pinnacle. Marc Brickman, the group's lighting designer, utilized hundreds of automated intelligent lighting fixtures and lasers, which were state-of-the-art at the time. By the 1994 "Division Bell" tour, the band was using extremely powerful, isotope-splitting copper-vapour lasers. These gold-coloured lasers were worth over $120,000 apiece and previously had only been used in nuclear research and high speed photography.