Importance

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Abstract

An optical device (101) for modifying a light distribution is made of transparent material and comprises a front wall (102) constituting a front portion (103), a coupling portion (104) for connecting to a light source system, and side walls (105, 106) between the coupling portion and the front portion. The front wall is configured to let through a first part of light emitted by the light source, and the side walls are configured to let through a second part of the light. The side walls have grooves (107) that refract at least 80% of the second part of the light obliquely rearwards with respect to a direction (d) from the coupling portion to the front portion. Thus, the Optical device can be used for illuminating both a floor and a ceiling so that light emitted to unwanted directions and potentially causing glare can be kept at a low level.

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First Claim