It should be recognised that in earlier editions of BS 5266-1, a reduced level of illumination of 0.2 lx was permitted in escape routes, provided they were kept unobstructed at all times. Wider routes should be treated as a number of 2 m wide strips, or open area (anti-panic) lighting should be provided.
In addition, clause 4.2.1 of BS EN 1838 requires that the central band of the escape route (consisting of not less than half the width of the route) should be illuminated to at least 50 % of that value. For escape routes up to 2 m in width, the horizontal illuminance along the centre line (at floor level) should be at least 1 lx. The defined emergency escape routes within buildings should be provided with at least the minimum levels of illumination recommended by clause 5.2.5 of BS 5266-1.
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