Abstract: A lighting system for a building having rooms (35) is disclosed which includes a plurality of light collectors (12, 14) for collecting ambient light, and a plurality of light guides (16) for conveying the light to a light accumulating vessel (20). The vessel (20) has an internal reflective surface (21). A plurality of second light guides (35) extend from the vessel (20) to the rooms (35) so that light which is collected in the vessel and which reflects in the vessel eventually finds it way to the light guides (34) supply to the rooms (35) to illuminate the rooms.

Abstract: A photodynamic therapy light source for treating skin conditions of a patient is disclosed which has a light source (10), a filter wheel (24), a light guide (60), and a control unit (40) for controlling the source. A spectral analyser (80) is included for analysing the spectrum received from a patient, and a camera (70) is also provided for taking images of the patient so that before and after treatment images can be taken for comparison purposes and for further diagnosis. A filter wheel (24) is provided which includes a number of filter elements (24?) for selectively enabling a particular bandwidth of illumination to be provided. The illumination from the unit (10) can be modulated so that a cyclic treatment of a period in which illumination is applied, followed by a period in which illumination is not applied is provided.

Abstract: A conveyor assembly (1), including a main conveyor (4) with engagement means (30) for securing articles (26) at selected positions along the conveyor (4), the conveyor (4) being arranged to travel along a path where the articles (26) are subject to a displacement force which acts to remove any articles (26) that are not secured by the engagement means (30).