| 摘要 |
A method and apparatus is provided that enables the rotational adjustment of a non rotationally-symmetrical optical element (24) in order to change the direction of the emitted light from an LED emitter (12) of a lighting unit (10) or to change the overall luminous distribution pattern in a luminaire (30) including a plurality of LED emitters (12) and optical elements (24A, 24B). The apparatus enables simple and accurate rotational adjustment, while providing for the retaining of the selected rotational position of the optical element (24). The adjustment can be made before or after the installation of the lighting unit (10) or luminaire (30), and can be accomplished without requiring tools and expert personnel. |
