Optical device for LED light sources

Optical device and optical component part for the targeted reproduction of light emitted by LED light sources. The optical device comprises at least two component parts, a first optical component part in the form of a solid waveguide and another component part for connection to the LED light source. In a system of Cartesian co-ordinates, the first optical component part has a length in the y direction shorter than or equal to its length in the z direction and shorter than or equal to its length in the x direction. An envelope of the first optical component part projected in an x-y plane forms essentially a rectangle. Proceeding from an x-y plane, the optical component part (′) tapers in the z direction to maximum ¼ of the largest width measured along y (By, max), with any design of the y-z flanks of the optical component part (′).