抄録
An experiment on luminous environment by artificial lighting, using an incandescent lamp and three types of fluorescent lamp respectively has been carried out in the living room of a prefabricated model house completely furnished. The relationships between the evaluation of pleasantness by lighting and the physical measurements were analyzed. The main results were obtained as follows. 1) The evaluation of first impression depends more on the level of illuminance than on the kind of lamp. The higher the illuminance level the better the first impression is obtained. In case of incandescent lamp the best result of first impression is reached at the level of 400lx (horizontal illuminance on the table). 2) The most suitable brightness pattern in the living room is realized by the iluminance range betwen 200 and 500lx. When compared the incandescent lamp with fluorescetnt ones, it is found that the ideal illuminance for the first is lower than for any of the latter. In case of fluorescent lamps, the higher the value of general color rendering index the lower the level of illuminance. 3) The evaluation of color rendering increases with the rise of the illuminance level, within the range used in the experiment. 4) The evaluation values of some items (such as "limpid-turbid" and "vivid-dull") on the impression appreciated vary according to the level of illuminance regardless the kind of the lamp used, on the contrary the values of another item ("cool-warm") varys according to the types of lamp. 5) The most ideal illuminance level for pleasantness in a living room has to be decided taking into consideration not only the most suitable lightness but also the other evaluation items.
