In this episode of LIGHT TALK, The Lumen Brothers discuss everything from Lighting Holiday Shows to The Rockettes.    Join David, Steve, and Zak as they pontificate about: More cancellations on Broadway; The Pink Floyd "Their Mortal Remains" exhibition; Dissecting The Radio City Music Hall Christmas Spectacular; The "Great Wurlitzer Organ"; Smelling the camels; Bringing theatre into other peoples' worlds; Commercialism and Religion combined for family entertainment; Projecting snow; Cheap snow effects; Particle generators; Nutcracker rules; Lighting the floor; Are followspots passé?; and What to communicate to stage managers on holiday shows.    Nothing is Taboo, Nothing is Sacred, and Very Little Makes Sense.