The CIE have published a set of guidelines for lighting design for energy conservation, which if adhered to will ensure the creation of a lit environment that is appropriate, energy conscious and that should satisfy both EEC and UK lighting directives. These are as follows:

1. Analyse the task in terms of difficulty, duration, criticality and location, to determine the lighting needs throughout a space, taking into account the visual differences among people due to age and other factors.

2. Design the lighting so as to provide the necesssary illiumination on the task in accordance with current recommendations.

3. Select the most efficient lamps appropriate to the type of lighting to be specified, taking into account the need for colour rendering.

4. Select luminaires that are efficient, having light distribution characteristics appropriate for the tasks and the environment, and not producing discomfort glare or serious veiling reflections.

5. Use the highest practical room surface reflectances, so as to achieve the best overall efficiency of the entire lighting system.

6. Integrate the lighting with the heating and air-conditioning systems, as dictated by climatic conditions, to save energy for cooling and heating purposes.

7. Provide a flexible lighting system, so that sections can be turned off or the lighting reduced when not needed.

8. Coordinate , when appropriate and when space permits, daylighting with electric lighting, ensuring that this does not introduce glare or other brightness imbalance in the environment.

9. Establish an adequate maintenance programme for periodic cleaning of the luminaires and room surfaces and for lamp replacement.1

These guidelines specifically exclude mention of the aesthetic requirements of the project, and it must be up to the architect and his lighting designer to ensure that in satisfying the guidelines, this is not at the expense of the lit appearance planned for the space.

1CIE. The Commission International de L'Eclarage

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