Typical Side Emitting Representative Spatial Radiation Pattern, Continued
100
90
80
70
60
50
40
30
20
10
0
-120 -100 -80 -60 -40 -20
0
20 40 60 80 100 120
Angular Displacement (Degrees)
Figure 8b. Typical Representative Spatial Radiation Pattern
for LUXEON Emitter White, Green, Cyan, Blue and Royal Blue.
Average Lumen Maintenance Characteristics
Lifetime for solidꢀstate lighting devices (LEDs) is typically defined in terms of lumen maintenance—the percentage of initial light
output remaining after a specified period of time. Philips Lumileds projects that LUXEON products will deliver on average 70ꢁ
lumen maintenance at 50,000 hours of operation. This performance is based on independent test data, Philips Lumileds historꢀ
ical data from tests run on similar material systems, and internal LUXEON reliability testing. This projection is based on constant
current 350 mA operation 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 Emitter DS25 (5/07)
16
LUMILEDS [ LUMILEDS LIGHTING COMPANY ]
