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Copyright ? 2006-2013 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.
XLamp XR-E LEds
10
notes
lumen maintenance Projections
Cree now uses standardized IeS LM-80-08 and TM-21-11 methods for collecting long-term data and extrapolating LeD
lumen maintenance. For information on the specifc Lm-80 data sets available for this LED, refer to the public Lm-80
results document at www.cree.com/xlamp_app_notes/Lm80_results.
please read the XLamp Long-Term Lumen maintenance application note at www.cree.com/xlamp_app_notes/lumen_
maintenance for more details on Cree’s lumen maintenance testing and forecasting. please read the XLamp Thermal
management application note at www.cree.com/xlamp_app_notes/thermal_management 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 defnes 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 specifed below must be
baked according to the baking conditions listed below.
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.
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
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 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
defned in the moisture Sensitivity section above.
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