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For intermittently used areas it is often best to have fast response lighting, eg fluorescent lighting (including energy saving bulbs) connected to occupancy sensors. Automatic on/off switches prevent these lights being left on accidentally.
For slow response lighting (eg metal halides or sodium lighting), it is best to use time controls to ensure lights are switched off out of occupancy hours.
For areas with large numbers of lights, there should be enough switches to allow staff to choose only those lights that are required. Label switches according to the lights they control.
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Controlling lights in parallel to windows allows lights to be switched off when there is adequate daylight.
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External lights should have both daylight sensors and a timer to ensure lights are only on when it is dark enough. Consider whether external lights have to be on all night - would switching them off late in the evening and back on again in the early morning still meet requirements?
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