PROBLEM TO BE SOLVED: To provide a lighting device for growing plants or preventing disease damage to plants, wherein light distribution can be easily controlled in parallel with the degree of the growth of the plants and also light is radiated to the plants so as not to cause leaf scorch damage to the plants when the plants come close to the device when growing.SOLUTION: The lighting device 1 includes a straight pipe-shaped lamp 3 and a reflection plate 7 extending along the longitudinal direction of the lamp 3, and is disposed above the target plants to be irradiated. The reflection plate 7 takes a non-reflective position escaping to a location where direct light to the lower part of the lamp 3 is not shielded, and a reflective position which locates in an aspect intersecting with a vertical direction so as to reflect part of the direct light in a direction orthogonal to the longitudinal direction of the lamp 3. The reflection plate 7 can be flexibly exchanged to either the reflective position or the non-reflective position, and can easily adjust light distribution of the light illuminated to the plant from the lamp 3, so that the plants can be irradiated with the light at an appropriate quantity of light in parallel with the degree of the growth of the plants. Also, the light from the lamp 3 is not directly radiated to the plants located just below when the reflection plate 7 locates at the reflecting position, so as to reduce the leaf scorch damage to the plants.COPYRIGHT: (C)2012,JPO&INPIT【課題】植物育成用又は植物病害防除用の照明装置において、植物の成長度合いに応じて配光を容易に制御でき、また、植物が成長して装置に近づいた場合に植物に葉焼け障害を生じないように光照射する。【解決手段】照明装置1は、直管形状のランプ3と、ランプ3の長手方向に沿って延びる反射板7とを備え、被照射対象である植物の上方に配置される。反射板7は、ランプ3の下方への直射光を遮光しない位置に退避した非反射位置と、直射光の一部をランプ3長手方向に直交する方向に反射するように鉛直方向と交わる向きに位置する反射位置とを取る。反射板7が反射位置と非反射位置とのいずれかに切替自在で、ランプ3から植物に照射される光の配光を容易に調整できるので、植物の成長度合いに応じて適切な光量で植物に光照射できる。また、反射板7が反射位置にあるとき、ランプ3からの光が直下の植物に直接照射されないので、植物の葉焼け障害を少なくできる。【選択図】図3
