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Increased Energy Savings by Individual Light Control
Rob Embrechts, Chris Van Bellegem
Etap NV, Malle
Belgium
Abstract
Modern lighting equipment only consumes a fourth of the energy that a typical lighting system of the seventies would need, thanks to a clear progress in lamp, ballast and reflector design. To save even more energy, without endangering lighting quality, we could use additional control techniques, such as daylight-dependent regulation. However, numerous case studies show that centralised control systems often cause annoyance and complaints. Dissatisfied users will sabotage such disturbing control systems. which reduces the theoretically expected energy savings to zero.
Only control systems, that function unnoticeably for the user, have a chance to save energy. Such systems control the lighting individually for each luminaire, dependent on the luminance level under this luminaire. At different test sites, such individual control systems were monitored for almost two years. The results do not only show additional energy savings between 20 and 50%, but also a very high user satisfaction.
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