FAQ: What is constant light control and how does it work?

FAQ: What is Constant Light Control and How Does it Work?

Constant light control, also known as daylight harvesting, is a control strategy commonly found in more advanced forms of lighting controls. This energy management tool uses natural light to offset the artificial lighting output required to sufficiently illuminate a space. Automatic dimming or switching off lights, when there is a sufficient level of ambient light reduces energy consumption and associated costs.

Sensors that use daylight harvesting functions work by measuring the overall light level within a zone and continually comparing this against the target LUX level. Light input is then very slowly increased or decreased to achieve and hold a constant level of illumination, creating a comfortable environment for work, leisure or relaxing.  

The diagrams above shows how the sensor, located near the window identifies that there is a low level of natural light in the room. To provide an efficient level of light, the sensor communicates with the ballast to increase the level of artificial light, according to pre-determined settings.

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