S.L. 260.3 Art. 20Lighting.

In all places where prisoners are required to live or work -

(a) the windows shall be such as to enable the prisoners to read or work by natural light in normal conditions and shall be so constructed that they can allow the entrance of fresh air, and shall, with due regard to security requirements, present in their size, location and construction as normal an appearance as possible;

(b) artificial light shall satisfy recognised technical standards and, as regards the cells, shall be capable of being dimmed at night in such a way as to permit supervision.