| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an interior room lighting system for lighting at nearly even illuminance by taking advantage of daylight and capable of lowering initial equipment cost, while reducing the number of optical sensors. SOLUTION: An interior ceiling surface provided with plural luminaires arranged with a space from each other and opening surfaces 1c is divided so that area is successively increased from the opening surface side, of which surface to be lighted receives the strong influence from the daylight, toward the depth direction, and divided into plural groups so that the number is reduced gradually in a direction parallel with the opening surface side, and one optical sensor 3 is arranged in each group, and luminaire 2 provided in each group is controlled in response to the output of the optical sensor 3. In the area, which is not affected by daylight, the number of the luminaire 2 to be controlled by one optical sensor 3 is increased in the depth direction and a direction at a right angle across the depth direction of the room-inside so as to reduce the number of optical sensors.</p> |
