An LED illumination system having a spectrum control unit for irradiating light for photosynthesis, the LED illumination system having a small variation in luminous intensity over a distance covered by a light source. For photosynthesis light irradiation having a spectrum control unit including at least a first panel having at least one LED of a first channel and at least one LED of a second channel. In this illumination system 100, the variation in luminous intensity is small over the distance covered by the light source, and the luminous intensity of the LED of the first channel 12 can be controlled independently of the luminous intensity of the LED of the second channel 13. [Selection] Figure 1【課題】スペクトル制御部を有する光合成用光照射のためのＬＥＤ式照明システムであって、光源がカバーする距離にわたって光度のばらつきが小さいＬＥＤ式照明システムを提供する。【解決手段】少なくとも一つの第１のチャネル１２のＬＥＤと、少なくとも一つの第２のチャネル１３のＬＥＤとを有する第１のパネル１０を少なくとも備えた、スペクトル制御部を有する光合成用光照射のための照明システム１００であって、光源がカバーする距離にわたって光度のばらつきが小さく、第１のチャネル１２のＬＥＤの光度が、第２のチャネル１３のＬＥＤの光度とは独立に制御可能である。【選択図】図１
