PROBLEM TO BE SOLVED: To irradiate the whole horizont wall surface at extremely uniform illuminance by changing a reflecting surface shape and the size and the density of beads particles and changing an angle formed from the main axis of a parabolic surface and a perpendicular drawn from a ceiling to a floor. ;SOLUTION: In a reflecting surface 3 composed of a parabolic curve (A) (an arc qr), a parabolic curve (B) (an arc qr'), and an elliptic curve (C) (an arc pr'), the shape of the surface 3 is changed so as to irradiate a direct light from a light source and a reflecting light from the surface 3 on a horizont wall surface at the maximum efficiency and a uniform illuminance. The size and the density of beads particles are changed to change the reflectance of the surface 3 and an angle formed from the main axis of the parabolic surface constituting a reflecting mirror and a perpendicular drawn from a ceiling to a floor. The position of the light source is so arranged as to be deviated from a focal point and a filter is arranged in an opening opposed to the surface 3 of the horizont light. The optimized positional constitution obtained by changing the height of the horizont wall surface is reviewed so that the radiation light from the horizont light can irradiate on the wall surface at the high and uniform illuminance.;COPYRIGHT: (C)1997,JPO
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