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Hi EQUINOX,

According to GE Technical Pamphlet TP-105 typical lumen loss is -10% at 1,500 hours use; -20% at 2,500 hours use; -30% at 5,000 hours use; and -40% at 11,000 hours use. So after a year of 8 hours use per day, your lumens are reduced about 20%.
 
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