the reflector channel may be made of a soft metal from which the reflector shape can be stamped if the reflector channel is formed from a polymer or plastic it may require some further processing to ensure high reflectivity a reflective coating may be added to the reflector structure using thin film processes or other type of coating processes one example coating includes alzak u2122 by the aluminum company of america alcoa the reflector channel may be formed by cutting stamping injection molding or extrusion designs that use individual reflectors for each light source generate a high irradiance spot when these spots are stacked end to end to create a line of light at a target surface there is a trade off between uniformity and irradiance the reflector channel could be extruded to a desired length with the curved inner surface or surfaces as needed which maintains uniform high irradiance light over the entire length at the target surface in one example the light pattern desired at the surface 24 is a single or multi line pattern the lines of light need relatively high radiance in a relatively narrow space the concentration or collimation of the light from the light source into the line pattern increases the irradiance at the surface fig2 shows an array of light sources such as 14 arranged.