The source of illumination for a cinema projector is
The source of illumination for a cinema projector is Carbon Arc lamp.
Carbon Arc lamps work by creating an arc of electricity between two carbon electrodes.
This arc produces a bright light that can be used to project images onto a screen.
They require regular maintenance, as the electrodes need to be frequently replaced, and they produce a lot of heat and noise, which can be problematic in a cinema setting.
Today, most cinemas use xenon lamps or digital projectors. Xenon lamps are similar to Carbon Arc lamps in that they produce a bright light by creating an electrical arc, but they are more efficient and produce less heat and noise.