A luminaire 1 comprising a light-directing element 3, e.g. a reflector, having a light emission window 5. Said reflector has a shape for directing light originating from an electric light source 7 into an optical fiber system 9 positioned in front of the light emission window. The optical fiber system comprises a bundle of optical fibers 11. Said shape is calculated in accordance with a ray-tracing algorithm which takes into account that said light source is voluminous, e.g. a Light Emitting Diode. The reflector has a shape which is composed of n solids of revolution of parabolic sectors 13, wherein said (adjoining) parabolic sectors form an integral surface 15. The invention further relates to a dynamic road marking unit 19.

A lamp assembly having a reflector (102) holding a lamp element, or burner (104). The reflector (102) typically is an ellipse, with the burner arc positioned at one foci of the ellipse. A reflector extension (108) is designed to mate to the reflector (102). The reflector extension (108) has a first open end toward the reflector (102). The first open end typically is in contact with the reflector (102) to form a seal around the perimeter preventing glass shards from escaping between the reflector (102) and reflector extension (108). Preferably, the reflector extension (108) contacts the reflector (102) around the perimeter of the reflector (102). The second end of the reflector extension (108) also is open to allow the light from the arc to exit the reflector extension (108). A transparent plate (110) placed across this second open end prevents glass from leaving the reflector extension (108). The transparent plate (110) typically is glass, and may have an antireflective coating applied to the plate to limit the light reflected by the plate (110). Two or more ventilation ports (112) in the reflector extension (108) allow cooling airflow into the cavity around the burner (104). These ventilation ports alternatively are a series of small holes or slots in the reflector extension (108).

A light collection for an arc lamp includes a parabolic reflector having primary and secondary parabolic reflector sections, the secondary parabolic reflector section divided into subsections, resulting in multiple arc images. The light collection system combines high efficiency and etendue preserving aperture shaping, and is particularly useful in projection display systems.

A light-conducting unit which can effectively balance the light-leaking effect and the light-propagation effect of the prismatic films forming the light-conducting space, and satisfy the requirements to reduce the weight of the unit is disclosed. A light-conducting unit comprising the first prismatic film and the second prismatic film, each having two major surfaces, one of which is a prismatic surface, and the other of which is a flat surface, said prismatic surface carrying prisms arranged substantially parallel to each other, wherein said two prismatic films are arranged so that the first edges of said prismatic films are positioned to form an opening, a light-conducting space is formed between said prismatic films, and the height of said light-conducting space does not substantially increase from said opening to the remote edges of the prismatic films opposing said opening, and the major surface of said first prismatic film which faces outside said light-conducting space is a light-emitting surface, and the arrangement of the both prismatic films and the directions of the prisms of the both prismatic films in relation to the incident direction of light are defined under the specific conditions.