Abstract: A zoom unit (1) of a light engine (5), comprising at least one lens (2), at least one first reflector (3) and at least one second reflector (4), other at least one lens (2) receives a collimated beam (LI) from a light source unit (6) of the light engine (5), the collimated beam (LI) being incident on the first reflector (3) after being converged by the lens (2), and being incident on the second reflector (4) after being reflected by the first reflector (3), to produce an output beam (L4) with its beam angle changed.

Abstract: A light source unit of a light engine is disclosed, wherein the light source unit includes a plurality of LED sub light source units each comprising at least one LED and an optical device corresponding to the at least one LED, the optical device is configured to modify a beam from each LED to be an approximately collimated beam.

Abstract: The present disclosure relates to an apparatus with a closed housing, as well as isolation and manufacture method thereof. The apparatus is arranged in a first medium during operating, and the inside of the apparatus is filled with a second medium the pressure of which is higher than the pressure of the first medium. By means of the apparatus with the closed housing and the isolation and manufacture method according to the embodiments of the present disclosure, at least one of the following objects may be achieved: achieving sufficient sealing with relatively low cost, improving the performance and/or lifetime of the devices contained in the apparatus, and facilitate the maintaining and replacing of the apparatus and the devices contained therein.

Abstract: A light source unit of a light engine is disclosed, wherein the light source unit includes a plurality of LED sub light source units each comprising at least one LED and an optical device corresponding to the at least one LED, the optical device is configured to modify a beam from each LED to be an approximately collimated beam.