Copyright © 2010, 2011 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree, the Cree logo and XLamp are registered trade-

marks of Cree, Inc.

5

XLAMP ML-E LEDS

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

0

100

200

300

400

500

600

0

25

50

75

100

125

150

Ambient Temperature (ºC)

Rj-a = 20°C/W

Rj-a = 30°C/W

Rj-a = 40°C/W

Rj-a = 50°C/W

0

20

40

60

80

100

120

-100

-80

-60

-40

-20

0

20

40

60

80

100

Angle (º)