| 摘要 |
<p>PROBLEM TO BE SOLVED: To exchange a plurality of lamps mounted at an elevation efficiently. SOLUTION: In the maintenance managing method of lamps, taking the average life of lamps 17-19 into consideration, all lamps are exchanged in every pre-determined period (for example, every four years when the kind of high rendering mercury lamp is a high brightness mercury discharge lamp 22), or, all lamps of the same kind are exchanged when a first lamp among the lamps 17-19 is broken. Thus, the frequency of changing lamps is reduced by changing a plurality of lamps mounted at an elevation in whole, and the frequency of dispatching a vehicle with scaling tower 24 is reduced and the cost for exchanging lamp can be reduced, moreover, a precautionary maintenance of the breakage of lamps can be carried out because all lamps are exchanged to new articles prior to their breakage.</p> |
