Datasheet

Copyright © 2009 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree, the
Cree logo and XLamp are registered trademarks of Cree, Inc.
5 CLD-DS23.000
Cree, Inc.
4600 Silicon Drive
Durham, NC 27703
USA Tel: [phone]
www.cree.com/xlamp
Thermal Design
The maximum forward current is determined by the thermal resistance between the LED junction and ambient. It is
crucial for the end product to be designed in a manner that minimizes the thermal resistance from the solder point to
ambient in order to optimize lamp life and optical characteristics.
Typical Spatial Distribution
Thermal Design
Cool White
0
50
100
150
200
250
300
350
400
0 25 50 75 100 125 150
Maximum Current (mA)
Ambient Temperature (ºC)
Rj-a = 10°C/W
Rj-a = 20°C/W
Rj-a = 30°C/W
Rj-a = 40°C/W
0
20
40
60
80
100
120
-100 -80 -60 -40 -20 0 20 40 60 80 100
Relative Luminous Intensity (%)
Angle (º)
Rj-a = 10°C/W
Rj-a = 20°C/W
Rj-a = 30°C/W
Rj-a = 40°C/W