Abstract: A light source attachment intended for use as a lantern for camping or for use in the home. The light source attachment may function also as a container for drinking water or other fluids or solids or for the measurement of volume of fluids or solids for use in cooking. A light source is positioned in order to direct a beam of light through a non-opaque lid and into a non-opaque container. The container may be modified with reflectors at its bottom or around its sides. The light beam encounters the side and bottom of the container and naturally illuminates all of its surfaces. The container thereby emanates a glow and thereby provides general illumination. The container may be filled with water during its use.

Abstract: An optical device for collecting light and selectively outputting or concentrating the light. A wedge layer has an optical index of refraction n.sub.1, and top, bottom and side surfaces intersecting to define an angle of inclination d. A back surface spans the top, bottom and side surface. A first layer is coupled to the bottom surface of the layer and has an index of refraction n.sub.2. The first layer index n.sub.2 causes light input through the back surface of the layer to be preferentially output into the first layer. A second layer is coupled to the bottom of the first layer and selectively causes output of light into ambient. Additional layers, such as an air gap, can be provided adjacent to the wedge shaped layer. The wedge shaped layer can also have a variable index of refraction n (x,y,z).