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

XLAMP ML-B 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

20

40

60

80

100

120

140

160

180

200

0

25

50

75

100

125

150

Ambient Temperature (ºC)

Rj-a = 30

°C/W

Rj-a = 40

°C/W

Rj-a = 50

°C/W

Rj-a = 60

°C/W

0

20

40

60

80

100

120

-90

-70

-50

-30

-10

10

30

50

70

90

Angle (º)