A light guide for illuminating display elements in a vehicle, which elements are on the dashboard, or the like; the guide comprises a light source, and a light guide positioned over both the elements to be illuminated and the light source; the light guide has an exterior surface which is spaced away from the elements being illuminated and which curves gradually toward the surface to be illuminated along the direction away from the light source thereby to concentrate light in the light guide body remote from the source; in certain embodiments, a prismatically shaped light guiding body intersects the principal light guide for concentrating light at a particular display element.
A flow cytometry apparatus for determining one or more characteristics of particles or the like flowing in a liquid stream includes a nozzle for generating a liquid flow stream for moving particles therethrough substantially one at a time. An arc lamp provides a beam of incoherent light to illuminate the particles moving in the flow stream. A prism in the light beam modifies non-uniform incoherent light, as provided by said arc lamp, to a more uniform beam of illumination which is directed to the flowing particles. A detector is included for detecting light with respect to each moving particle and for associating the detected light with one or more characteristics of the particles.
An illuminated vanity mirror visor includes a light-transmitting housing which allows the utilization of a single light source such as a bulb which can be located behind the mirror to transmit light to opposite sides of the mirror through integral lenses for directing the light outwardly for use of the mirror in low ambient light conditions. The light-transmitting housing includes opposed spaced and curved light collecting surfaces at legs which extend towards opposite ends of the housing and terminate in integrally molded lens. In an alternative embodiment of the invention, the light source mounted between the facing spaced surfaces of the light-transmitting housing is rotatably mounted and includes multi-colored surfaces such that the color temperature of the light can be varied to provide different lighting effects for the user.
