The lifts and winding gear were again replaced in 1992. The same year the tower complex was renamed Tower World, and was opened by Diana, Princess of Wales. The tower is usually painted in dark red, except for its centenary year in 1994 when it was painted gold by abseiling painters. In 1998, a "Walk of Faith" glass floor panel was opened at the top of the tower. Made up of two sheets of laminated glass, it weighs half a tonne and is two inches thick. In October 2007, a laser beam installed on the Tower for the duration of the annual Illuminations was criticised by astronomer Sir Patrick Moore, presenter of television programme "The Sky at Night", who said: "Light pollution is a huge problem. I am not saying we should turn all the lights out, that is not practical, but there are some things which are very unnecessary. The Blackpool Tower light is certainly something I do not think we should be doing. I very much oppose it." The beam could be seen away; Moore called for it to be stopped. The centre for Astrophysics at the University of Central Lancashire in Preston said the laser has added to a spiralling problem affecting astronomy.