DS21 LUMILEDS [Lumileds Lighting Company], DS21 Datasheet - Page 7

• Manufacturer Part Number: DS21
• Description: power light source Luxeon Line
• Manufacturer: LUMILEDS [Lumileds Lighting Company]

Average Lumen Maintenance Characteristics
Lifetime for solid state 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.
Luxeon Line
7
Document #: DS21 (10/05)