This is my first post. Bear with me, now that I'm being questioned by admin. My OCD is kicking in and I'm trying to learn. What I have figured out, we have a 96 circuit box , 48 with a sensor keypad, although some don't have breakers and this was installed in 05. The new teacher said they just purchased a new Etc color 20 control board. 90% of the lights don't work. She gave me headphones to talk and I started testing starting with the catwalk. The plug would have voltage. The light wouldn't have continuity. I would take the bulb out and it would have continuity and look good. Some were black and you could see they were burnt. I cut a wire jumper to connect the pin holes and the light fixture would have continuity. I then noticed most of the bulbs, one pin was arced but still had continuity and in the light it wouldn't. I took an end cap apart and the ceramic part fell apart where the bulb plugs in and one of the metal cups was dark. Years ago I would get a hand full of bulbs. One thing that has me puzzled. The circuits on the catwalk averaged 123 volts and the pipes above the stage averaged 113 to 115. Years and years ago, I would get a few 120 volt and a few 115 volt bulbs. Some were 750w and some were 575w. It's what the teacher asked for. Last few years they only asked for 115v and twice as many. Is there really a difference. I'm used to seeing it as a nomenclature.... 110, 115, 120. The new teacher said she wants to go LED but things needed to be changed in the panel and it would be costly. Where do I begin?