A light radiator comprises a cylindrical optical conductor rod in which light rays are guided into the optical conductor rod from one end portion or both end portions thereof. The guided light rays into the optical conductor rod are radiated from the optical conductor rod in a radial direction. The optical conductor rod is divided into plural pieces in radical direction along its center line as a common line and the respective division surfaces are provided with a reflection surface.

A light fixture for providing a cool uniform illumination into a photography field which is adjustable in intensity while maintaining a uniform color temperature. The light fixture includes a light source, an adjustable shutter for adjusting the amount of light passing therethrough, a reflector mirror having a dichroic heat coating thereon for reflecting the light from the shutter while passing any heat contained therein, and a round reflector for receiving the light from the reflector mirror through an end face and for dispersing the light through the circumference thereof by internal reflectance.

A light transformer for converting light from a short arc lamp into an arcuate shape of uniform intensity. Mirror means associated with the short arc lamp projects light from the short arc lamp as a plurality of separate images conforming to the desired arcuate shape onto a plurality of reflecting facets also formed in the desired arcuate shape. Light pipe means formed in the desired arcuate shape is disposed at one end to receive light images via the facets and to emit light at the other end in the desired arcuate shape.

A lighting device mounted within a jewelry setting which is directed at a facet of a gemstone to increase the brilliance and brightness of the gemstone. The lighting means is a low dispersion, focused beam of light which is directed at a facet of a gemstone so that the gemstone captures the light. In the preferred embodiment, the lighting source is radioluminescent or electroluminescent and uses various focusing means to focus the light from the lighting means. Fiber optic material may be used to direct light at the gemstone. The fiber optic material may contain dyes which absorb ambient light and cause the light to be directed in desired wave lengths at the gemstone. The fiber optic material may absorb light from the lighting means, as well as ambient light, to provide additional illumination in relatively high ambient light situations.

An image scanning apparatus comprises a linear light source being arranged in parallel with a picture plane to be scanned. The linear light source is composed of a cylindrical rod made of a transparent material on which light diffusing reflecting layer of stripe-shaped is provided along a longitudinal axis of the cylindrical, rod and a lighting means for entering light fluxes into the inside of the rod at least from one end thereof to emit light fluxes each having directivity from the outer surface of the rod.