An even level of illumination is more important than absolute light levels.
This prevents dark areas in which intruders can lurk.
This provides a well-lit area in the form of a strip around the perimeter. To be effective an intruder must have to pass through this well-lit area. The lighting column should not be an aid to scaling the fence.
This generally refers to the areas around buildings within the protected area. The aim is to produce even illumination without dense shadows.
This is used to cast a strong light on the walls of buildings so that intruders are visible either in silhouette or by the shadows which they cast. Lights should be mounted up high, out of reach of intruders.
This is used at the perimeter entrance and gatehouse in order to:
· reveal approaching vehicles and pedestrians and allow guards to identify them, verify passes, carry out vehicle searches, and
· Conceal guards within the gatehouse while allowing them to see out.
Topping up lighting
This is used to eliminate dark areas not adequately lit by area lighting or floodlighting. Such areas may be lit locally by small light fittings (eg bulkhead fittings) or from a distance by narrow angle flood lights.