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The economics of lighting: collective replacement of light bulbs (tubes)

For discharge lamps (tubes) with a long life of 5,000 to 7,000 hours, collective replacement of lamps (tubes) can be adopted, which will be more economical than replacing individual lamps (tubes) after they are damaged. During the 70% period of the average life of a batch of discharge lamps, the damage rate is generally only 10% to 20%. If collective replacement can be carried out during 2/3 of the rated life, it is still relatively economical. Collective replacement of lamps (tubes) can be carried out at the same time as cleaning the lamps, because the working time spent on replacing lamps (tubes) is not more than cleaning.

Regular cleaning and collective replacement of lamps (tubes) have the following advantages:

(1) A high illumination can be maintained.

(2) Maintenance work can be planned in advance to reduce trouble. In factories, it can be carried out during the shutdown period at the end of the year.

(3) Because the collectively replaced lamps (tubes) are purchased in batches, their color and brightness are relatively consistent. If they are replaced sporadically, there will be a sense of disharmony.

(4) The labor cost of replacing individual bulbs (tubes) can far outweigh the additional cost of collective replacement. A small number of old bulbs (tubes) can be saved for use in sporadic replacements.

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