In addition to lux level sensing, dimming detectors are able to provide automatic control of lighting output.
A dimming detector can be used to control the light output of luminaires that are fitted with dimming ballasts.
The detector measures the overall light level in the detection area and regulates the output of the luminaires, ensuring the correct lux level (maintained illuminance) for the area and saving energy when natural daylight can be used to replace/supplement luminaires (daylight harvesting).
Maintained illuminance with absence or presence detection
- Provides either presence or absence detection with maintained illuminance in an office or area, allowing the user to manually override the maintained level, by dimming up or down, or switching off and on via wall switch.
- After occupation and the time delay has ended, the dimming level can be programmed to dim for a time period before switching off, or programmed to never switch off, but instead stays at a low dimmed output during non-occupation. Very useful for warehousing with 24/7 operations, or corridors for health and safety reasons.
- Direct dimming detectors can also be programmed to switch on and off (at separate light levels) according to the local light level when the area is occupied, with or without a time delay (to avoid nuisance switch- ing). This can be programmed as well as maintained illuminance on the same sensor.
- Many lighting schemes can be 'over lit' because of the initial brightness of the new lamps, over compen- sation for dirt/lamp life, and over-design due to room shape and size. Dimming detectors allow installed lighting to be 'dimmed' to achieve the correct illuminance level, and increase gradually to compensate for the anticipated light loss over time.
- If the dimming and switched channels are separated, one channel can work in absence detection, whilst the other channel works in presence detection. For example, meeting room with: fixed output wall wash- ers in presence detection mode on Channel 1 (no dimming), always on when room is occupied; Dimming fittings in centre of room (over table) on Channel 2 in absence mode, for dimming down/extinguishing when making presentations, etc.
Combined maintained illuminance with switching
Combined maintained illuminance with switching. The dimming detector can be configured to dim a row of luminaires (those closest to window) whilst simultaneously switching the other luminaires in the room.