5 Behind the Scenes Details That Change How You See Movies | Cracked.com: "You see, he was an electrician. His job began and ended with setting up the lighting rig. When he set up the diffusion frame, he crossed over into the territory of the grips (lighting and rigging technicians), and crossing union barriers is a big no-no. Needless to say, when something as simple as setting up a light requires two people from different unions, things can get complicated in a hurry, and it's a large reason filming takes so long and costs so much."
'via Blog this'