PROBLEM TO BE SOLVED: To provide a plant cultivation luminaire capable of significantly reducing power cost of a light source of artificial light in a plant factory, relative to a prior art with a simple structure.SOLUTION: A plant cultivation luminaire comprises plural LEDs arranged on a reference plane 12 of a substrate and a lens for controlling so that emitted light beams B1, B2, B3 of these LEDs are emitted in a prescribed emission direction at a prescribed emission angle. An interval between the LEDs, the emission direction and the emission angle of the emitted light beams B1, B2, B3, and a distance L between the reference plane 12 and a virtual radiation plane P are adjusted so that the emitted light beams B1, B2, B3 are partially overlapped on the radiation plane P thereby forming overlapping areas 50, 51, 53. In use time, the emitted light beams B1, B2, B3 are radiated to a single cultivation object plant through the lens, and a core part of a radiated part (a leaf aggregation region) of the cultivation object plant is included in the overlapping areas.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2017,JPO&INPIT【課題】 簡単な構造で、植物工場における人工光光源の電力コストを先行技術よりも大幅に低減できる植物栽培用照明装置を提供する。【解決手段】 基板の基準面12に配置された複数のLEDと、それらLEDの出射光ビームB1、B2、B3が所定の出射方向に所定の出射角度で出射されるように制御するレンズを備える。前記LED間の間隔と、出射光ビームB1、B2、B3の前記出射方向及び前記出射角度と、基準面12と仮想の照射面Pとの距離Lは、照射面P上で出射光ビームB1、B2、B3が部分的に重なり合って重なり領域50、51、53が形成されるように調整される。使用時には、出射光ビームB1、B2、B3が前記レンズを介して単一の栽培対象植物に向けて照射され、前記栽培対象植物の被照射部(葉集合領域)の芯部が前記重なり領域に包含されるようにする。【選択図】 図2
