Datasheet

2121
xlamp
®
xT-E lEDs
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.
21
Copyright © 2011-2015 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. UL
®
and the UR logo are registered trademarks of UL LLC.
21
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.
PERFORMANCE GROUPS – LUMINOUS FLUX (T
J
= 85 °C)
XLampXT-EwhiteLEDsaretestedforluminousuxandplacedintooneofthefollowingluminous-uxgroups.
Group Code Min. Luminous Flux Max. Luminous Flux
P3 73.9 80.6
P4 80.6 87.4
Q2 87.4 93.9
Q3 93.9 100
Q4 100 107
Q5 107 114
R2 114 122
R3 122 130
R4 130 139
R5 139 148
S2 148 156
S3 156 164
S4 164 172
Relative Intensity vs. Current (Tj = 85ºC)
0
200
400
600
800
1000
1200
1400
1600
0 20 40 60 80 100 120 140
Maximum Current (mA)
Ambient Temperature (ºC)
Rj-a = 10°C/W
Rj-a = 15°C/W
Rj-a = 20°C/W
Rj-a = 25°C/W