My husband and I were fortunate enough to be there the night of the "Lighting" and were were standing beside two men- one being the event planner and the other being responsible for the actual supervision of hanging the lights. They were both excited and so pleased with the crowds reaction. The second gentleman told me they were LED lights and some other types, controlled by just 3 plugs. I am pretty sure not the kind of plugs I use at home, but they were so interesting to talk too. It is unbelievable to see them go on in person.