Luxeon Line

7

Document #: DS21 (10/05)

Average Lumen Maintenance Characteristics

Lifetime for solidstate lighting devices (LEDs) is typically defined in terms of

lumen maintenance—the percentage of initial light output remaining after a

specified period of time. Lumileds projects that Luxeon products will deliver on

average 70% lumen maintenance at 50,000 hours of operation. This

performance is based on independent test data, Lumileds historical data from

tests run on similar material systems, and internal Luxeon reliability testing. This

projection is based on constant current 350 mA operation per LED (700 mA for

Line) with junction temperature maintained at or below 90

°C. Observation of

design limits included in this data sheet is required in order to achieve this

projected lumen maintenance.