Developments in lamps and fittings over the past twenty years have solved many problems such as energy consumption, ambient temperatures, shock and vibration effects. Light sources are now available for mounting in the restricted spaces between ceiling and deck. The technique of providing the correct kind of illumination and degree
of brightness, particularly in passenger ship is a matter for lighting specialists. Suffice it to say that in a passenger ship each of the public spaces, e.g. lounges, dining rooms, bars, cabins, etc., will require different treatment. Nevertheless crew accommodation in cargo ships including tankers, tends to reach a higher standard of comfort and also deserves specialist attention.
The importance of adequate and effective lighting in machinery spaces needs no emphasis. Machinery rooms are usually of great height and obstructed by gangways, piping and other interference. Narrow beam light sources, e.g. 250w fluorescent-reflector lamps in firings with integral control gear, are desirable.
A suitably constructed fitting requires practically no maintenance being independent of atmospheric pollution. Local lighting of gauges switchboards, etc. requires higher illumination levels. Fittings with fiberglass bodies reduce maintenance, i.e. no painting or rust problems. In boiler rooms heat problems must be taken into to maintain the correct lumen output. For the shaft funnel fluorescents diffusing fittings are most suitable.
Fluorescent lamps are unsuitable for refrigerated spaces unless the temperature is high than -5oC. At lower temperature starting can be slow and light output poor. A suitable light source is the mercury fluorescent lamp which operate down to -5oC.