| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an illumination system in which there is no appearance problem and energy is not wasted by lighting brightly only those lamps replaced, even when some lamps are replaced out of plural illumination apparatuses. SOLUTION: The controller 20 outputs an illumination adjustment signal that changes the illumination ratio corresponding to the accumulated lighting time so as to maintain the light output of the lamp 11 to the set value. The illumination apparatus 10 comprises a lamp replacement switch 15 that is manually operated at the replacement of the lamp 11, and the lighting circuit control section 13 controls the power to the lamp 11 by making corrections to the illumination ratio instructed by the illumination adjustment signal so that the light output of the lamp immediately after replacement may be close to the set value. And when the accumulated lighting time measured by the clocking section 23 is reset by the reset switch of the controller 20, in case the lighting circuit control section 13 is making corrections, the correction is released at that point.</p> |
