LIGHTING DEVICE WITH AN OPTICAL ELEMENT HAVING A FLUID PASSAGE

摘要

A lighting device (1) comprises at least one light source (3) and at least one optical element (5). The optical element (5) may be arranged to transmit light emitted by the light source (3). The optical element (5) comprises a light transmissive material (7) and at least one passage (9) extending through the light transmissive material (7) for allowing a flow of fluid through said optical element (5). The passage (9) is arranged such that a major portion of the light (16) emitted by said light source (3) entering the passage (9) further propagates through the light transmissive material (7). The optical element (5) comprises a plurality of layers (18) of the light transmissive material (7) spaced apart from each other, each layer comprising at least one through-hole (11).