Copyright © 2010 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-DS31 Rev 1

Cree, Inc.

4600 Silicon Drive

Durham, NC 27703

USA Tel: +1.919.313.5300

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

Typical Spatial Radiation Pattern

0

20

40

60

80

100

120

-100

-80

-60

-40

-20

0

20

40

60

80

100

Angle (º)

Thermal Design

0

20

40

60

80

100

120

140

160

180

200

0

25

50

75

100

125

150

Ambient Temperature (ºC)

Rj-a = 10°C/W

Rj-a = 15°C/W

Rj-a = 20°C/W

Rj-a = 25°C/W