Dimmer modules manage low voltage switch and line voltage output controls of the dimmer's lighting loads. Stand-alone dimmers typically have status indicators, analog inputs for photocell or occupancy sensors, diagnostics, and are able to optimize responses for different types of lighting fixtures. Dimmers can be used for specific spaces, such as areas with audio-visual presentations, or throughout the total system for managing large facilities.
Like occupancy sensors, dimmer switches connected to a relay panel. Preset dimming controls from a relay panel provide predetermined dimming for several channels or loads. Presets are tamper-proof, that is to say, they will not allow anyone except the approved and authorized lighting control personnel to override the presets.
Dimming can be used to implement several energy savings strategies. For example, lights can be dimmed when the demand for electricity exceeds a predetermined level, possibly as part of an overall load shedding policy. Such reductions are typically unnoticeable for most users. Another example involves fluorescent lamps. The output of fluorescent lamps decreases over the life of the lamp (the expected depreciated output may be used as an initial design factor). Dimming can be used with new fluorescent lamps to produce the desired light level and then gradually manage the lighting level over the life of the lamps, to produce both a constant level of light output as well as a longer lamp life.