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Electrical Applications 2 by David W. Tyler

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124 Illumination
and as far as possible, vandal-proof. The transparent parts are made
of prestressed glass or impact resistance plastic. To minimise main-
tenance, the surfaces should be self-cleaning by the action of wind
and rain. Therefore any patterns or prisms are on the inner surface
of the glass. Electrical connections to them are generally by means
of conduit or mineral insulated cables.
In most buildings use is made of daylight when available, sup-
plemented by artificial light. The correct balance between the two is
difficult especially when the rooms are deep when the variation in
daylighting from a position near a window to that severa