Lighting is responsible for between 30 and 45 percent of the total energy consumption in an office block. A modern lighting installation can, however, halve the energy consumption.
This requires a combination of energy-efficient light sources and reflectors, as well as a system for managing the light. A side effect is that energy-efficient light fittings also produces less heat, which reduces the need for air conditioning and improves the indoor climate in an office block. Similar measures can be introduced in a domestic setting. The company Fagerhult, which develops, produces and sells lighting systems, suggests the following:
- Presence controls operated by movement detectors switch off the light automatically no more than 15 minutes after the last person has left the room or fallen asleep at their desk. Seldom-used spaces can be equipped with presence dampening instead. This means a basic level of 10 percent, so that the room is not left completely in the dark. When someone enters the room, the strength of the light is increased immediately to 100 percent.
- Efficient use of daylight can save further energy. By using daylight control technology, light sensors, the light can be adjusted in accordance with how much daylight reaches different parts of a room or office landscape. Light fittings in bright areas close to windows do not emit the same amount of light as fittings in the dark zones further into the building or room.
This article was first published in Advantage Environment printed in February 2008