An illuminating device (10) is provided with a casing configured from an outer cover (11) having a U shape, a transparent cover (12) provided so as to cover the opening of the U shape, a first side cover (13) provided on the left-hand side, and a second side cover (14) provided on the right-hand side. Further, the illuminating device (10) is provided with a light-emitting element package (21) mounted with a semiconductor light-emitting element in the casing, a circuit board (22) mounted with the light-emitting element package (21), a heat-dissipating base (24) to which the circuit board (22) is secured and which a coolant conduit (25) is provided in close contact with, a filmy insulating heat-dissipating member (23) for electrically insulating the circuit board (22) from the heat-dissipating base (24), and a reflector (26) for reflecting light. The inside of the casing is sealed. Therefore, the problems due to dew condensation and moisture absorption while the semiconductor light-emitting element is efficiently cooled by means of a coolant, such as water are solved, and an illuminating device for plant cultivation using the semiconductor light-emitting element, which has a long life and can maintain high efficiency, as the light source and a plant cultivation system using the same are provided.可提供解決藉由水等冷媒,將半導體發光元件效率佳地進行冷卻時因結露、吸濕所造成的不良情形者,且為使用長壽命且高效率維持的半導體發光元件作為光源之植物栽培用的照明裝置及使用其之植物栽培系統。照明裝置(10)係具備有由字型外裝蓋件(11)、以在字空出的部分加蓋的方式而設的透明蓋件(12)、設在左側面的第1側面蓋件(13)、設在右側面的第2側面蓋件(14)所構成的框體。此外,照明裝置(10)係具備有:在框體內搭載有半導體發光元件的發光元件封裝體(21)、搭載發光元件封裝體(21)的電路基板(22)、固定電路基板(22)並且與冷媒導管(25)密接而設的放熱基板(24)、將電路基板(22)與放熱基板(24)作電性絕緣的薄膜狀絕緣性放熱材(23)、及使光作反射的反射器(26)。框體的內部係呈密閉。10...照明裝置11...外裝蓋件12...透明蓋件13...第1側面蓋件14...第2側面蓋件15...配管接頭16...第1配管耦合器17...第2配管耦合器21...發光元件封裝體22...電路基板23...絕緣性放熱材24...放熱基板25...冷媒導管26...反射器27...反射面31...照明控制配線
