| 摘要 |
PROBLEM TO BE SOLVED: To reduce the dimension of an opening part of a ceiling, and obtain the sufficient illuminance by arranging multiple semi-conductor light sources in a light source fitting body so that an optical axis passes through a nearly center of an opening part of a device fitting surface, and setting dimension of the opening part at a degree that the optical axis of the light source, which are arranged at the specified angle of elevation, can be passed through there. SOLUTION: Multiple semi-conductor light source LEDs 12 are arranged in a light source fitting body 11 so that an optical axes L of the LEDs 12 pass through a nearly center of an opening part of the fitting body 11. Each LED 12 is arranged at a position at 30 degree or more of angle of elevation. Consequently, when the fitting body 11 is fitted so that the center of the opening surface of the fitting body 11 is positioned at the center of the opening part 13 provided in a ceiling surface 13, the optical axis L of each LED 12 passes through the center of the opening part 14. At the time of looking at a down light from inside of a room, the light is seen as it is emitted at about 67 degree from the opening part having a diameter at 30mm. Since the opening part 14 is small, the light source is not directly seen except for a position just under the down light, and even in the case where the light source is seen, it is not dazzle in comparison with a compact point light source. |
