Which detail shows that Kamen's light-controlled systems were very good? Kamen was introduced to a man who sold audio-visual equipment for big light and music shows. When he was sixteen, Kamen spent all summer building high-powered light-controlled systems. One of his inventions was used in theaters, the Museum of Natural History, and the New York Planetarium. To make one of his devices, he bought every kind of electrical equipment that he could find.