| 摘要 |
<p>PROBLEM TO BE SOLVED: To replace the lamp with a new lamp as appropriate without continuously using the dark lamp which has come near the end of life and to carry on daily activities always in a healthy illumination environment. SOLUTION: A light strength detecting element for detecting brightness of a lamp is incorporated in an illumination apparatus and compares its brightness with the brightness at the initial stage of use. Thereby, when the brightness has reached a maintenance level that is defined as a lifetime, the lamp is replaced individually. The replacement of the lamp is done by a dealer who visits the user, and the dealer takes back the replaced lamp for recovery.</p> |
