Commonly where light level control is required, the lighting control system will include the use of photocells that detect the level of daylight present. If that level of daylight rises above a pre-set level then the lights will be either switched off, or dimmed down (depending on the light fitting and the control).
If the level of natural light decreases below the set parameter, then the lighting is switched on, or dimmed at a higher pre-set level.
Lighting Control Allows for Pre-Programming
More sophisticated light level controls also allow for time delays to prevent nuisance switching. Without a time delay, dark clouds for example, could cause lights to switch on and off too frequently during a short time period.
Many systems also provide optional manual control via a local switch input, allowing the user to override the dimming levels and turn the lighting on or off.
‘Twilight’ switches detect light levels and designed to switch external security lights on at ‘twilight’, or to turn on display or sign lighting.
Lighting Control Balances Light
Daylight harvesting is a term used to describe the ability of the lighting control system to optimise the balance between natural and artificial lighting for the occupants of a building. Highly accurate photocells are required that can precisely measure the amount of light as a lux level on a desk surface, or as relative brightness from a window.
Artificial lighting is automatically adjusted up or down to maintain a constant brightness dependent on the amount of natural light available.
Studies suggest that the over illumination found in many workplaces is a common cause of worker fatigue. Maximising natural daylight increases productivity and increases a sense of wellbeing. It may increase your ability to retain quality staff.
Additionally all stakeholders can feel good from an environmental stance, knowing that energy is being used only where necessary. The added benefit when artificial lighting is reduced, is that there is a reduction in power usage, and therefore in energy costs!
To get more information, or for your free consultation, contact at Intelligent Environments today.