ABSTRACT
The optical path, and everything in it, helps to determine the amount of light a fixture collects from the lamp source and outputs. That includes the lamp, reflector, filters, patterns, effects, mirrors, lenses, and the exit glass. All reflectors, regardless of their geometry, present a specular or mirror-like surface, which reflects light uniformly. When light strikes a specular surface it is reflected at an angle equal to the angle of incidence. In addition to the light source, the reflector geometry—or, in the case of Light-emitting diodes, the lenses—have a great influence on the intensity, efficiency, uniformity of the beam, and cost. Although parabolic aluminized reflector cans are very common in entertainment lighting, parabolic reflectors in automated lighting are rare. Ultraviolet (UV) light is not visible light, but it is present in the spectrum of light from discharge lamps. A UV/Infrared (IR) filter is a band-pass filter that lets visible light through but blocks most of the UV and IR energy.
