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Definition of "ILL" |
The initial lamp lumen rating is measured after the first 100 hours of operation. The mean lamp lumen rating is measured when the lamp reaches 40% of its average rated life. Together, these two ratings measure the lamp lumen depreciation that occurs during a lamp's life. Lumenus T5 lamps maintain 95% of their light output during their lifetime. |
Definition of "ILL" |
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