A braking system for electric step motors that operate in conjunction with a light assembly, including a moving head for pan or tilt thereof or for moving internal optical components. Three embodiments are provided, depending on the presence of a gas or an electric model, each further comprises a combination heat and smoke detector located on the ceiling immediately above the appliance. Alternatively, an organosilicon compound covering layer is provided on a surface of the transparent electroconductive oxide layer. Detectors may be positioned at places where the fluid may flow. The cathode may be a carbon fiber substrate with gold deposited thereon.