Patent ID: 7661834

Claim:
A lighting unit for producing linearly polarized light directed onto a target surface, said lighting unit comprises at least a source unit producing light in the visible spectral range and an optically translucent polarizing front unit providing protection against external effects, said source unit and said polarizing front unit are placed in a housing in which an electric cable passes through, characterized in that said source unit contains at least one panel having a number of high intensity LED devices arranged in a predetermined pattern on one of its sides; said polarizing front unit contains at least one optically transparent rigid carrier and a polarizing filter foil applied onto said carrier; at least a portion of said housing is made from heat conductive material, and it keeps said polarizing front unit in a fixed position so that they confine a hermetically closed inner space; said panel is positioned in a fixed way parallel with said polarizing unit within said inner space so that said high intensity LED devices face towards said polarizing front unit and wherein the intensity of the resultant light measured at a distance of 0.5 m from said polarizing front unit is between 5-60 mW/cm 2 .