Abstract: A lamp assembly comprises a lamp housing having a removable top cover and a removable end cover. A pair of cradle arrangements are contained in the lamp housing. One of the cradle arrangements comprises two individual lamp cradles, while the other cradle arrangement comprises three individual cradles. The cradle arrangements may be removed from the lamp housing by removing the top cover or, alternatively, by removing the end cover. Each of the individual cradles has an ultra violet lamp mounted thereon. When the cradle arrangements are positioned in the lamp housing, the individual cradles are disposed successively along a common axis but in a staggered fashion with respect to the common axis. The cradles are arranged so that the individual lamps are substantially parallel to the common axis and so that the ends of neighbouring cradles overlap each other. It is thus possible to achieve a relatively long light source using relatively short lamps.