It is important that any lighting system is fit for purpose: It should provide a quality and quantity of light that is appropriate for
the environment in which it is being used; enable tasks to be performed efficiently and effectively; be perceived as comfortable and give
people a high level of satisfaction. The aim is to achieve this whilst providing a good balance of cost and energy consumption through
good design and optimum selection of products.
Lighting accounts for between 5 and 15% of residential energy use and up to 30% of commercial building energy use, and continues to
increase. In certain business types, for example the retail sector, lighting can account for up to 80% of energy use.
This is due to long operating hours and the need to “keep things bright” and stand out from the competition.
Therefore, in this context, greater sustainability can be achieved by making a conscious decision to reduce the amount of electricity
used through appropriate lighting design (including the use of natural light and design techniques to reduce the amount of artificial
lighting needed) and by selecting energy efficient luminaires and effective control systems.