XREWHT-L1-0000-00601 Datasheet, PDF (9/12 Pages) Cree, Inc – XLamp® XR-E LED

Notes
Lumen Maintenance Projections
Based on internal long-term reliability testing and standardized forecasting methods, Cree projects XLamp LEDs to
maintain an average of 70% lumen maintenance after 50,000 hours, provided the LED junction temperature is main-
tained at or below 80°C.
Please read the XLamp Reliability application note for more details on Cree’s lumen maintenance testing and forecasting.
Please read the XLamp Thermal Management application note for details on how thermal design, ambient temperature,
and drive current affect the LED junction temperature.
Moisture Sensitivity
XLamp LEDs are shipped in sealed, moisture-barrier bags (MBB) designed for long shelf life. If XLamp LEDs are exposed
to moist environments after opening the MBB packaging but before soldering, damage to the LED may occur during the
soldering operation. The following derating table defines the maximum exposure time (in days) for an XLamp LED in
the listed humidity and temperature conditions. LEDs with exposure time longer than the time specified below must be
baked according to the baking conditions listed below.
Temperature
30ºC
25ºC
20ºC
30%
9
12
17
40%
5
7
9
Maximum Percent Relative Humidity
50%
60%
70%
4
3
1
5
4
2
7
6
2
80%
1
1
2
90%
1
1
1
Baking Conditions
It is not necessary to bake all XLamp LEDs. Only the LEDs that meet all of the following criteria must be baked:
1. LEDs that have been removed from the original MBB packaging
2. LEDs that have been exposed to a humid environment longer than listed in the Moisture Sensitivity section above
3. LEDs that have not been soldered
LEDs should be baked at 80ºC for 24 hours. LEDs may be baked on the original reels. Remove LEDs from MBB packaging
before baking. Do not bake parts at temperatures higher than 80ºC. This baking operation resets the exposure time as
defined in the Moisture Sensitivity section above.
Storage Conditions
XLamp LEDs that have been removed from original MBB packaging but not soldered yet should be stored in a room or
cabinet that will maintain an atmosphere of 25 ± 5ºC and no greater than 10% RH (relative humidity). For LEDs stored
in these conditions, storage time does not add to exposure time as defined in the Moisture Sensitivity section above.
RoHS Compliance
The levels of environmentally sensitive, persistent biologically toxic (PBT), persistent organic pollutants (POP), or oth-
erwise restricted materials in this product are below the maximum concentration values (also referred to as the thresh-
old limits) permitted for such substances, or are used in an exempted application, in accordance with EU Directive
2002/95/EC on the restriction of the use of certain hazardous substances in electrical and electronic equipment (RoHS),
as amended through April 21, 2006.
Vision Advisory Claim
Users should be cautioned not to stare at the light of this LED product. The bright light can damage the eye.
Copyright © 2006-2007 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.

CLD-DS05.006
Cree, Inc.
4600 Silicon Drive
Durham, NC 27703
USA Tel: [phone]
www.cree.com/xlamp