Fig. 3. Concept of SRSS in space station. switching devices, intensity controllers and an illuminating device. In order to meet the requirement of a light supply during the night period, an auxiliary artificial light source will be used to supply light using the same light path as that of the solar ray. REQUIREMENTS OF JAPANESE CELSS STUDY Japanese CELSS (Controlled Ecological Life Support System) study requires the luminous flux shown in Table 1 for the cultivation experiment of higher plants and algae, room illumination and sunbathing. A total luminous flux of 363,000 Im during the daytime and 106,000 Im during nighttime are required for this system. The Japanese CELSS study also requires the spectral bandwidth between 350 and 850 nm
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