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Controlling lighting

Why control lighting?

Switching to LED from traditional lighting technology, such as halogen or fluorescent, can provide up to 90% energy savings. However,
LED lighting can provide other benefits, such as instantly controlling on/off without deterioration in the fittings operating life. These
benefits are suitable for lighting control and allow for significantly improved energy savings and a better lit environment.

Lighting controls can provide an additional 50% energy saving

The government recognises the benefit of lighting control and is starting to introduce regulation that focuses on improvements in
the energy efficiency of a complete building. The introduction of Building Regulations Part L (2013) is an example of this change and
introduces the concept of a Lighting Energy Numeric Indicator (LENI – see page 256) that calculates the energy usage of a building
2
per metre .
LENI

LENI is a new measurement of lighting that changes the focus from the performance of an individual fitting, to the performance of
the full lighting installation (see page 256).

What are the types of lighting control?

Good lighting control systems should adjust the lighting to compensate for changes in daylight levels and the usage of the area.
The main types of control are:

1 ABSENCE DETECTION
Manual on, auto off

Lighting is switched on using a time switch The lighting stays on using a timer. The lighting is automatically switched off
or detection from an occupancy sensor. after a specified period of time.

2 PRESENCE DETECTION
Auto on, auto off

The lighting is switched on after detection The sensor detects any further activity. The lighting is switched off when the
by an occupancy sensor. sensor doesn’t detect any further activity.

258 Technical jcc.co.uk