1. First demonstrated by Thomas Edison in 1879
2. Used a carbon filament contained in a evacuated glass
envelope, burned for 40 hours
3. Tungsten filament developed in 1909
4. First used by the Paris Opera House in 1880
5. The Savoy Theatre in London was the first theatre to use electric
light exclusively in 1881, powered by a 120 hp steam engine
6. Many theatres refurbished their gaslight system with electric
lights, vastly increasing the intensity of light in the theatre
7. The advent of dimmers allowed for precise control of intensities History of Lighting Design