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XLamp Xr-c Leds
Copyright © 2007-2011 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.
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 maintained 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 denes 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 specied below must be baked according to
the baking conditions listed below.
Temp. Maximum Percent Relative Humidity
30% 40% 50% 60% 70% 80% 90%
30 ºC 9 5 4 3 1 1 1
25 ºC 12 7 5 4 2 1 1
20 ºC 17 9 7 6 2 2 1
Cree recommends keeping XLamp LEDs in their sealed
moisture-barrier packaging until immediately prior to use.
Cree also recommends returning any unused LEDS to
the resealable moisture-barrier bag and closing the bag
immediately after use.
Baking Conditions
It is not necessary to bake all XLamp LEDs. Only the LEDs
that meet all of the following criteria must be baked:
• LEDs that have been removed from the original MBB
packaging.
• LEDs that have been exposed to a humid environment
longer than listed in the Moisture Sensitivity section
above.
• LEDs that have not been soldered.
LEDs should be baked at 80 ºC 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 80 ºC. This baking operation
resets the exposure time as dened 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 ± 5 ºC
and no greater than 10% RH (relative humidity). For LEDs
stored in these conditions, storage time does not add
to exposure time as dened in the Moisture Sensitivity
section above.
RoHS Compliance
The levels of environmentally sensitive, persistent
biologically toxic (PBT), persistent organic pollutants
(POP), or otherwise restricted materials in this product are
below the maximum concentration values (also referred to
as the threshold 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
WARNING: Do not look at exposed lamp in operation. Eye
injury can result. See LED Eye Safety at www.cree.com/
products/pdf/XLamp_EyeSafety.pdf.
Intellectual Property
For remote phosphor applications, a separate license to
certain Cree patents is required.