1. XLamp XR-E Lighting-Class LEDLumen Maintenance July 2009

2. Semiconductor Reliability Testing

Reliability test methods and acceptance criteria for semiconductor components have been standardized (JEDEC, EIAJ, others) and practiced for decades

• Think:processors, regulators, microcontrollers, etc..

3. LED Reliability Testing

LEDs are semiconductorcomponents that happen to emit light

Cree conducts all the traditional standardized semiconductor component reliability testing on all of our LED lamps( http://www.cree.com/products/pdf/XLamp_Reliability.pdf )

Cree has been active in leading the industry standardization of an additional test series IES LM-80-2008 to characterize the Lumen Maintenance aspect of LED semiconductor components

4. Lumen Maintenance Definition L 70= 10,000 hours

Definition: change in light output of a light source over operational life, relative to initially measured light output

L xx= time to xx% of original light output

L 70= time to 70% of original light output

L 50= time to 50% of original light output

Lumen Maintenance:400W metal halide lamp Traditional light sources gradually dim then fail catastrophically (burn out) 5. LED Lumen Maintenance History