| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent illumination intensity of an irradiated surface from being shifted from a substantially constant value, and enhance operating performance under a lighting while both the difference in illumination intensity of the irradiated surface due to the difference in height of the irradiated surface from each light source and the shift in luminous energy to the irradiated surface due to ornaments attached to the lighting system are taken into consideration in the lighting system having fluctuation characteristics allowing the luminous energy of each lighting source to be changed with time. SOLUTION: The change in the range between the upper limit and the lower limit of the change in luminous energy for lighting sources 2b and 2d located at the intermediate position of a luminaire 1, is made broader than the change in range of luminous energy for a lighting source 2c located at the lower part of the luminaire 1. And the change in the range between the upper limit and the lower limit of the change in luminous energy of lighting sourses 2a and 2e is made broader than the change in range of luminous energy for the lighting sources 2b and 2d located at the intermediate position of the luminaire 1.</p> |
