To provide a light source which is rapidly popularized but has a strong directivity and a large wavelength distribution, a problem arises depending on the application. With respect to applications in plant factories and the like in particular, a light source device complementing directivity and wavelength distribution is required.SOLUTION: A light source device including an LED and an electrodeless discharge lamp is realized, and by using such a light source device, it can cope with control including broad irradiation and irradiation of a wide wavelength and use of light intensity, blinking, spotlight and the like And realized a plant growing method using a light source device and a light source device which are suitable for application to a plant factory, which can obtain light quantity in a necessary wavelength range, in particular.BACKGROUND OF THE INVENTION【課題】LEDは急激に普及した光源であるが指向性が強く波長分布が大きいでことから用途によっては問題が生じる。特に植物工場等での応用に関しては、指向性及び波長分布を補完した光源装置が求められている。【解決手段】LED及び無電極放電灯を含む光源装置を実現し、かかる光源装置を用いることにより、広域照射や広域波長の照射と光の強弱、点滅、スポットライト的な使用を含む制御に対応するとともに、必要な波長域の光量を得ることの出来る、特に植物工場への応用に適した光源装置及び光源装置を用いた植物の育成方法を実現した。【選択図】図1
