Lighting tech Pete Pearce discovers ballast central. By Admin November 10, 2015 November 10, 2015 728 member, hollywood lighting partners set lighting designs, Lighting Facts, local 728, peter pearce, show lights, Uncategorized Some shows have dimmer rooms. This new tv show has a room full of HMI ballasts. The grid in the bar has a ring of 4k’s around it that get turned on and off depending on the direction the camera is looking.