Abstract
Composite sources of “Yuko lamps” reflected type, 400W (DR400/T) and blue fluorescent tubes, 40W (FL40B-F) were tested for simulating the spectral quality of real phases of daylight in the visible range, using a light panel and a growth cabinet (Fig. 1) .
It was proved that the spectral distribution curves of the composite light were assemble closely to those of daylight in corresponded color temperatures from 4, 500 to 7, 500°K (Fig. 4), and that the deviation in the relative band energy ratios of the composite light to daylight was within ± 15% in the wavelengths from 400 to 750 nm (Table 1) and there was no remarkable difference in the band ratios of B/R, R/FR, and B/FR between the composite light and daylight (Table 2) .
The distribution of illuminance and spectral quality of irradiance in the cabinet was examined under the composite source of 4 Yuko lamps and 14 blue fluorescent tubes. As the result, it was found that the horizontal distribution of illuminance was within ±15% at the distance longer than 50 cm from the lamps (Fig. 5) and the rates of spectral components and the energy ratios were little different in the horizontal and vertical positions (Table 3) .
