Average Lumen Maintenance Characteristics
Heat sink temperature, Drive Current, Average Lumen Maintenance after 500 hours of operation
35° C 700 mA 90%
75° C 700 mA 75%
85°C 600 mA 65%
Note:
Luxeon V Portable is designed primarily for portable lighting and other applications requiring operating lifetimes of 500 hours and less. While the device will operate past 500 hours, its lumen maintenance cannot yet be characterized.
Thats a cop out, they have had plenty of time to characterize it now
Average lumen maintenance is dependant on heat-sink temperature. A recoverable light output loss may occur during the first 500 hours of operation.
In our case, that would be the temperature of the pad where we attach our Luxeons to.
Over driving beyond this 700mA significantly accelerates the degredation of the Luxeon.