The lighting industry as a whole, including small specialist sectors such as tunnels, has been undergoing great changes in the last decade. Changes in light source technology, more product suppliers, low energy and maintenance requirements, and even the design of longer and wider tunnels are the leading factors in a sometimes confusing array of procurement considerations. Maurice Jones tries to unravel some of the major trends Maintaining safety whilst keeping running costs down is a major and growing concern of tunnel operators, and to some extent this includes metro companies, mines and other managers of underground space. Riding into this scenario has come the 'White Knight white light' of the large LED, the heralds of which often seem to promise to sweep away all cost problems with the capabilities of low power requirements, low maintenance, long life and easy replacement when required.
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