Adjustable illumination device providing polarized light having an indication means for providing adjustment

Abstract

An illumination device () for illuminating an at least partially reflective surface (S) viewable by an observer (O) is disclosed. The illumination device () comprises a light-emitting module () adapted to generate polarized light having a selected direction of polarization. Further, the illumination device () is adapted to illuminate the at least partially reflective surface (S) with the polarized light, and is adjustable so as to effect adjustment in the direction of polarization of light illuminating the at least partially reflective surface (S) in relation to the orientation of a plane of incidence of light incident on the at least partially reflective surface. An indicator () is arranged such as to provide guidance for the observer (O) how to adjust the direction of polarization of light illuminating the at least partially reflective surface (S). Thereby, the extent of light reflection from the at least partially reflective surface (S) may be adjusted. A luminaire comprising such an illumination device () and a method for facilitating for the observer to adjust the extent of light reflection from the at least partially reflective surface (S) is also disclosed.