Product family data sheet
Copyright © 2015-2017 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, XLamp® and
EasyWhite® are registered trademarks and the Cree logo is a trademark of Cree, Inc. UL® and the UR logo are registered trademarks of UL LLC.
Cree, Inc.
4600 Silicon Drive
Durham, NC 27703
USA Tel: +1.919.313.5300
WWW.CREE.COM/XLAMP
CLD-DS120 REV 4
Cree® XLamp® CXB1820 LED
PRODUCT DESCRIPTION
The XLamp® CXB1820 LED Array is a
member of the second generation of
the CXA family that delivers up to 30%
higher efcacy and up to 20% higher
lumens than the rst generation in the
same LES. The higher performance
second generation CXA LED Arrays
provide a drop-in performance upgrade
to existing CXA LED designs to shorten
product development time. In addition,
the CXB LEDs also allow lighting
manufacturers to achieve the same
or better performance with a smaller
LES, enabling a smaller, more impactful
luminaire. Available in 2-step, 3-step
and 5-step EasyWhite® bins and 2-step
and 3-step Premium Color bins, the
CXB1820 LED delivers high lumen
output and high efcacy in a single,
easy-to-use package that eliminates the
need for reow soldering.
The CX Family LED Design Guide
provides basic information on the
requirements to use the CXB1820 LED
successfully in luminaire designs.
FEATURES
• 12-mm optical source
• Mechanical and optical design
consistent with other CXA18 and
CXB18 LEDs with a 12-mm optical
source
• Available in 70-, 80-, 90- and
95-minimum CRI options
• Cree EasyWhite® 2-, 3- and 5-step
binning
• Premium Color 2- and 3-step binning
• Forward voltage option: 36-V class
• 85°C binning and characterization
• Extremely uniform color over viewing
angle
• Top-side solder connections
• Thermocouple attach point
• NEMA SSL-3 2011 standard ux bins
• RoHS and REACh compliant
• UL® recognized component
(E349212)
TABLE OF CONTENTS
Characteristics ............................................2
Operating Limits ..........................................2
Flux Characteristics, EasyWhite® Order
Codes and Bins ...........................................3
Flux Characteristics, Premium Color
Order Codes and Bins .................................6
Relative Spectral Power Distribution,
EasyWhite® .................................................7
Relative Spectral Power Distribution,
Premium Color ............................................7
Electrical Characteristics ............................8
Relative Luminous Flux ...............................9
Typical Spatial Distribution ...................... 10
Performance Groups - Brightness .......... 10
EasyWhite® Performance Groups -
Chromaticity ............................................. 11
Premium Color Performance Groups -
Chromaticity ............................................. 12
Cree EasyWhite® Bins Plotted on the
1931 CIE Color Space .............................. 13
Cree Premium Color Bins Plotted on the
1931 CIE Color Space .............................. 14
Bin and Order Code Formats ................... 16
Mechanical Dimensions .......................... 16
Thermal Design ........................................ 17
Notes ........................................................ 18
Packaging ................................................. 19
Copyright © 2015-2017 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, XLamp® and EasyWhite® are registered trademarks and the Cree logo is a
trademark of Cree, Inc. UL® and the UR logo are registered trademarks of UL LLC.
2
XLamp® CXB1820 LED
CHARACTERISTICS
Characteristics Unit Minimum Typical Maximum
Viewing angle (FWHM) degrees 115
ESD withstand voltage (HBM per Mil-Std-883D) V 8000
DC forward current mA 1050*
Reverse current mA 0.1
Forward voltage (@ 550mA, 85°C) V 35 38
* Refer to the Operating Limits section.
OPERATING LIMITS
The maximum current rating of the CXB1820 depends on the case temperature (Tc) when the LED has reached thermal equilibrium under
steady-state operation. The graph shown below assumes that the system design employs good thermal management (thermal interface
material and heat sink) and may vary when poor thermal management is employed. Please refer to the Mechanical Dimensions section
on page 16 for the location of the Tc measurement point.
Another important factor in good thermal management is the temperature of the Light Emitting Surface (LES). Cree recommends a
maximum LES temperature of 135°C to ensure optimal LED lifetime. Please refer to the Thermal Design section on page 17 for more
information on LES temperature measurement.
CXB1820
0
200
400
600
800
1000
1200
025 50 75 100 125 150
If (mA)
Case Temperature (°C)
Copyright © 2015-2017 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, XLamp® and EasyWhite® are registered trademarks and the Cree logo is a
trademark of Cree, Inc. UL® and the UR logo are registered trademarks of UL LLC.
3
XLamp® CXB1820 LED
Notes
• Cree maintains a tolerance of ±7% on ux and power measurements, ±0.005 on chromaticity (CCx, CCy) measurements and a tolerance of ±2 on CRI
measurements. See the Measurements section (page 18).
• Cree XLamp CXB1820 LED order codes specify only a minimum ux bin and not a maximum. Cree may ship reels in ux bins higher than the minimum
specied by the order code without advance notice. Shipments will always adhere to the chromaticity bin restrictions specied by the order code.
* For 80 CRI minimum LEDs, CRI R9 minimum is 0 with a ±2 tolerance. For 90 CRI minimum LEDs, CRI R9 typical is 60.
** Flux values @ 25°C are calculated and for reference only.
FLUX CHARACTERISTICS, EASYWHITE® ORDER CODES AND BINS (IF mA, TJ 
The following table provides order codes for XLamp CXB1820 LEDs. For a complete description of the order code nomenclature, please
see the Bin and Order Code Formats section (page 16).
Nominal
CCT
CRI* Minimum Luminous Flux 2-Step 3-Step 5-Step
Min Typ Group 


 Group Order Code Group Order Code Group Order Code
6500K
70 ---
S2 2780 3050
65E
CXB1820-0000-
000N0BS265E
S4 2990 3280 CXB1820-0000-
000N0BS465E
T2 3200 3510 CXB1820-0000-
000N0BT265E
80 ---
S2 2780 3050
65E
CXB1820-0000-
000N0HS265E
S4 2990 3280 CXB1820-0000-
000N0HS465E
5700K
70 ---
S2 2780 3050
57E
CXB1820-0000-
000N0BS257E
S4 2990 3280 CXB1820-0000-
000N0BS457E
T2 3200 3510 CXB1820-0000-
000N0BT257E
80 ---
S2 2780 3050
57E
CXB1820-0000-
000N0HS257E
S4 2990 3280 CXB1820-0000-
000N0HS457E
5000K
70 ---
S2 2780 3050
50E
CXB1820-0000-
000N0BS250E
S4 2990 3280 CXB1820-0000-
000N0BS450E
T2 3200 3510 CXB1820-0000-
000N0BT250E
80 ---
S2 2780 3050
50G
CXB1820-0000-
000N0HS250G 50E
CXB1820-0000-
000N0HS250E
S4 2990 3280 CXB1820-0000-
000N0HS450G
CXB1820-0000-
000N0HS450E
90 92
R2 2420 2655
50G
CXB1820-0000-
000N0UR250G
R4 2600 2852 CXB1820-0000-
000N0UR450G
Copyright © 2015-2017 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, XLamp® and EasyWhite® are registered trademarks and the Cree logo is a
trademark of Cree, Inc. UL® and the UR logo are registered trademarks of UL LLC.
4
XLamp® CXB1820 LED
Notes
• Cree maintains a tolerance of ±7% on ux and power measurements, ±0.005 on chromaticity (CCx, CCy) measurements and a tolerance of ±2 on CRI
measurements. See the Measurements section (page 18).
• Cree XLamp CXB1820 LED order codes specify only a minimum ux bin and not a maximum. Cree may ship reels in ux bins higher than the minimum
specied by the order code without advance notice. Shipments will always adhere to the chromaticity bin restrictions specied by the order code.
* For 80 CRI minimum LEDs, CRI R9 minimum is 0 with a ±2 tolerance. For 90 CRI minimum LEDs, CRI R9 typical is 60.
** Flux values @ 25°C are calculated and for reference only.
Nominal
CCT
CRI* Minimum Luminous Flux 2-Step 3-Step 5-Step
Min Typ Group 


 Group Order Code Group Order Code Group Order Code
4000K
70 ---
S2 2780 3050
40E
CXB1820-0000-
000N0BS240E
S4 2990 3280 CXB1820-0000-
000N0BS440E
T2 3200 3510 CXB1820-0000-
000N0BT240E
80 ---
R4 2600 2852
40H
CXB1820-0000-
000N0HR440H
40G
CXB1820-0000-
000N0HR440G
S2 2780 3050 CXB1820-0000-
000N0HS240H
CXB1820-0000-
000N0HS240G
S4 2990 3280 CXB1820-0000-
000N0HS440H
CXB1820-0000-
000N0HS440G
90 92
Q4 2260 2479
40H
CXB1820-0000-
000N0UQ440H
40G
CXB1820-0000-
000N0UQ440G
R2 2420 2655 CXB1820-0000-
000N0UR240H
CXB1820-0000-
000N0UR240G
R4 2600 2852 CXB1820-0000-
000N0UR440H
CXB1820-0000-
000N0UR440G
3500K
80 ---
R4 2600 2852
35H
CXB1820-0000-
000N0HR435H 35G
CXB1820-0000-
000N0HR435G
S2 2780 3050 CXB1820-0000-
000N0HS235H
CXB1820-0000-
000N0HS235G
90 92
Q4 2260 2479
35H
CXB1820-0000-
000N0UQ435H 35G
CXB1820-0000-
000N0UQ435G
R2 2420 2655 CXB1820-0000-
000N0UR235H
CXB1820-0000-
000N0UR235G
3000K
80 ---
R2 2420 2655
30H
CXB1820-0000-
000N0HR230H
30G
CXB1820-0000-
000N0HR230G
R4 2600 2852 CXB1820-0000-
000N0HR430H
CXB1820-0000-
000N0HR430G
S2 2780 3050 CXB1820-0000-
000N0HS230H
CXB1820-0000-
000N0HS230G
90 92
Q2 2100 2304
30H
CXB1820-0000-
000N0UQ230H
30G
CXB1820-0000-
000N0UQ230G
Q4 2260 2479 CXB1820-0000-
000N0UQ430H
CXB1820-0000-
000N0UQ430G
R2 2420 2655 CXB1820-0000-
000N0UR230H
CXB1820-0000-
000N0UR230G
FLUX CHARACTERISTICS, EASYWHITE® ORDER CODES AND BINS (IF mA, TJ 
Copyright © 2015-2017 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, XLamp® and EasyWhite® are registered trademarks and the Cree logo is a
trademark of Cree, Inc. UL® and the UR logo are registered trademarks of UL LLC.
5
XLamp® CXB1820 LED
Notes
• Cree maintains a tolerance of ±7% on ux and power measurements, ±0.005 on chromaticity (CCx, CCy) measurements and a tolerance of ±2 on CRI
measurements. See the Measurements section (page 18).
• Cree XLamp CXB1820 LED order codes specify only a minimum ux bin and not a maximum. Cree may ship reels in ux bins higher than the minimum
specied by the order code without advance notice. Shipments will always adhere to the chromaticity bin restrictions specied by the order code.
* For 80 CRI minimum LEDs, CRI R9 minimum is 0 with a ±2 tolerance. For 90 CRI minimum LEDs, CRI R9 typical is 60.
** Flux values @ 25°C are calculated and for reference only.
Nominal
CCT
CRI* Minimum Luminous Flux 2-Step 3-Step 5-Step
Min Typ Group 


 Group Order Code Group Order Code Group Order Code
2700K
80 ---
R2 2420 2655
27H
CXB1820-0000-
000N0HR227H 27G
CXB1820-0000-
000N0HR227G
R4 2600 2852 CXB1820-0000-
000N0HR427H
CXB1820-0000-
000N0HR427G
90 92
P4 1965 2156
27H
CXB1820-0000-
000N0UP427H
27G
CXB1820-0000-
000N0UP427G
Q2 2100 2304 CXB1820-0000-
000N0UQ227H
CXB1820-0000-
000N0UQ227G
Q4 2260 2479 CXB1820-0000-
000N0UQ427H
CXB1820-0000-
000N0UQ427G
FLUX CHARACTERISTICS, EASYWHITE® ORDER CODES AND BINS (IF mA, TJ 
Copyright © 2015-2017 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, XLamp® and EasyWhite® are registered trademarks and the Cree logo is a
trademark of Cree, Inc. UL® and the UR logo are registered trademarks of UL LLC.
6
XLamp® CXB1820 LED
Notes
• Cree maintains a tolerance of ±7% on ux and power measurements, ±0.005 on chromaticity (CCx, CCy) measurements and a tolerance of ±2 on CRI
measurements. See the Measurements section (page 18).
• Cree XLamp CXB1820 LED order codes specify only a minimum ux bin and not a maximum. Cree may ship reels in ux bins higher than the minimum
specied by the order code without advance notice. Shipments will always adhere to the chromaticity bin restrictions specied by the order code.
* For 80 CRI minimum LEDs, CRI R9 minimum is 0 with a ±2 tolerance. For 90 CRI minimum LEDs, CRI R9 typical is 60.
** Flux values @ 25°C are calculated and for reference only.
FLUX CHARACTERISTICS, PREMIUM COLOR ORDER CODES AND BINS (IF mA, TJ 
Fidelity
Nominal
CCT
CRI* Minimum Luminous Flux Typical
Luminous


2-Step
Min Typ Group 


 Group Order Code
4000K 95 98 Q2 2100 2304 2297 L5A CXB1820-0000-000N0ZQ2L5A
3500K 95 98 Q2 2100 2304 2212 35H CXB1820-0000-000N0ZQ235H
3000K 95 98 P4 1965 2156 2127 30H CXB1820-0000-000N0ZP430H
2700K 95 98 P2 1830 2007 2006 27H CXB1820-0000-000N0ZP227H
Specialty
Nominal
CCT
CRI Minimum Luminous Flux Typical
Luminous


2-Step 3-Step
Min Typ Group 


 Group Order Code Group Order Code Group Order Code
3100K 90 92
N4 1710 1876
2451 31Q
CXB1820-0000-
000N0UN431Q
Q2 2100 2304 CXB1820-0000-
000N0UQ231Q
3000K
80 --- R2 2420 2655 2850 L7B CXB1820-0000-
000N0HR2L7B
90 92
P4 1965 2156
2451 30Q 30U
CXB1820-0000-
000N0UP430U
Q2 2100 2304 CXB1820-0000-
000N0UQ230Q
CXB1820-0000-
000N0UQ230U
Q4 2260 2479 CXB1820-0000-
000N0UQ430Q
CXB1820-0000-
000N0UQ430U
95 98 P2 1830 2007 2127 L7C CXB1820-0000-
000N0ZP2L7C
Copyright © 2015-2017 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, XLamp® and EasyWhite® are registered trademarks and the Cree logo is a
trademark of Cree, Inc. UL® and the UR logo are registered trademarks of UL LLC.
7
XLamp® CXB1820 LED
RELATIVE SPECTRAL POWER DISTRIBUTION, EASYWHITE®
The following graph is the result of a series of pulsed measurements at 550mA and TJ = 85°C.
RELATIVE SPECTRAL POWER DISTRIBUTION, PREMIUM COLOR
The following graphs are the result of a series of pulsed measurements at 550mA and TJ = 85°C.
Fidelity
Relative Spectral Power Distribution
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
380 430 480 530 580 630 680 730 780
Relative Spectral Power
Wavelength (nm)
5000 K, 70 CRI
4000 K, 70 CRI
3000 K, 80 CRI
3000 K, 90 CRI
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
380 430 480 530 580 630 680 730 780
Relative Spectral Power
Wavelength (nm)
4000 K, Z CRI
3500 K, Z CRI
3000 K, Z CRI
2700 K, Z CRI
Copyright © 2015-2017 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, XLamp® and EasyWhite® are registered trademarks and the Cree logo is a
trademark of Cree, Inc. UL® and the UR logo are registered trademarks of UL LLC.
8
XLamp® CXB1820 LED
RELATIVE SPECTRAL POWER DISTRIBUTION, PREMIUM COLOR - CONTINUED
Specialty
ELECTRICAL CHARACTERISTICS
The following graph is the result of a series of steady-state measurements.
Relative Spectral Power Distribution
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
380 430 480 530 580 630 680 730 780
Relative Spectral Power
Wavelength (nm)
31Q, 3100 K, 90 CRI
30Q, 3000 K, 90 CRI
30U, 3000 K, 90 CRI
L7B, 3000 K 80 CRI
L7C, 3000 K, Z CRI
33
34
35
36
37
38
39
350 450 550 650 750 850 950 1050
Voltage (V)
Current (mA)
Tc = 25 °C
Tc = 55 °C
Tc = 85 °C
Tc = 105 °C
Copyright © 2015-2017 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, XLamp® and EasyWhite® are registered trademarks and the Cree logo is a
trademark of Cree, Inc. UL® and the UR logo are registered trademarks of UL LLC.
9
XLamp® CXB1820 LED
RELATIVE LUMINOUS FLUX
The relative luminous ux values provided below are the ratio of measurements of the CXB1820 LED at steady-state operation at the given
conditions, divided by the ux measured during binning, which is a pulsed measurement at 550mA at TJ = 85°C.
For example, at steady-state operation of Tc = 55°C, IF = 650mA, the relative luminous ux ratio is 120% in the chart below. A CXB1820
LED that measures 2100lm during binning will deliver 2520lm (2100 * 1.2) at steady-state operation of Tc = 55°C, IF = 650mA.
0%
20%
40%
60%
80%
100%
120%
140%
160%
180%
200%
350 450 550 650 750 850 950 1050
Relative Luminous Flux
Current (mA)
Tc = 25 °C
Tc = 55 °C
Tc = 85 °C
Tc = 105 °C
Copyright © 2015-2017 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, XLamp® and EasyWhite® are registered trademarks and the Cree logo is a
trademark of Cree, Inc. UL® and the UR logo are registered trademarks of UL LLC.
10
XLamp® CXB1820 LED
TYPICAL SPATIAL DISTRIBUTION
PERFORMANCE GROUPS - BRIGHTNESS (IF mA, TJ 
XLamp CXB1820 LEDs are tested for luminous ux and placed into one of the following bins.
Group Code Minimum Luminous Flux Maximum Luminous Flux
N4 1710 1830
P2 1830 1965
P4 1965 2100
Q2 2100 2260
Q4 2260 2420
R2 2420 2600
R4 2600 2780
S2 2780 2990
S4 2990 3200
T2 3200 3440
T4 3440 3680
Far Field
0%
20%
40%
60%
80%
100%
-90 -70 -50 -30 -10 10 30 50 70 90
Relative Luminous Intensity
Angle (º)
Copyright © 2015-2017 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, XLamp® and EasyWhite® are registered trademarks and the Cree logo is a
trademark of Cree, Inc. UL® and the UR logo are registered trademarks of UL LLC.
11
XLamp® CXB1820 LED
EASYWHITE® PERFORMANCE GROUPS - CHROMATICITY (TJ 
XLamp CXB1820 LEDs are tested for chromaticity and placed into one of the regions dened by the following bounding coordinates.
EasyWhite Color Temperatures – 2-Step
Code CCT x y
40H 4000K
0.3777 0.3739
0.3797 0.3816
0.3861 0.3855
0.3838 0.3777
35H 3500K
0.4022 0.3858
0.4053 0.3942
0.4125 0.3977
0.4091 0.3891
30H 3000K
0.4287 0.3975
0.4328 0.4064
0.4390 0.4086
0.4347 0.3996
27H 2700K
0.4524 0.4048
0.4574 0.4140
0.4633 0.4154
0.4581 0.4062
EasyWhite Color Temperatures – 3-Step Ellipse
Bin Code CCT Center Point Major Axis Minor Axis Rotation Angle

x y a b
50G 5000K 0.3447 0.3553 0.00840 0.00312 65.0
40G 4000K 0.3818 0.3797 0.00939 0.00402 53.7
35G 3500K 0.4073 0.3917 0.00927 0.00414 54.0
30G 3000K 0.4338 0.4030 0.00834 0.00408 53.2
27G 2700K 0.4577 0.4099 0.00834 0.00420 48.5
EasyWhite Color Temperatures – 5-Step Ellipse
Bin Code CCT Center Point Major Axis Minor Axis Rotation Angle

x y a b
65E 6500K 0.3123 0.3282 0.01110 0.00550 61.0
57E 5700K 0.3287 0.3417 0.01230 0.00600 72.0
50E 5000K 0.3447 0.3553 0.01400 0.00520 65.0
40E 4000K 0.3818 0.3797 0.01565 0.00670 53.7
Copyright © 2015-2017 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, XLamp® and EasyWhite® are registered trademarks and the Cree logo is a
trademark of Cree, Inc. UL® and the UR logo are registered trademarks of UL LLC.
12
XLamp® CXB1820 LED
PREMIUM COLOR PERFORMANCE GROUPS - CHROMATICITY (TJ
XLamp CXB1820 LEDs are tested for chromaticity and placed into one of the regions dened by the following bounding coordinates.
Fidelity
EasyWhite Color Temperatures – 2-Step
Code CCT x y
L5A 4000K
0.3764 0.3711
0.3784 0.3787
0.3847 0.3826
0.3825 0.3748
35H 3500K
0.4022 0.3858
0.4053 0.3942
0.4125 0.3977
0.4091 0.3891
30H 3000K
0.4287 0.3975
0.4328 0.4064
0.4390 0.4086
0.4347 0.3996
27H 2700K
0.4524 0.4048
0.4574 0.4140
0.4633 0.4154
0.4581 0.4062
Specialty
EasyWhite Color Temperatures – 2-Step
Code CCT x y
L7B 3000K
0.4263 0.3848
0.4296 0.3916
0.4361 0.3938
0.4326 0.3868
L7C 3000K
0.4192 0.3754
0.4224 0.3823
0.4291 0.3847
0.4257 0.3777
EasyWhite Color Temperatures – 3-Step Ellipse
Bin Code CCT Center Point Major Axis Minor Axis Rotation Angle

x y a b
31Q 3100K 0.4236 0.3888 0.00848 0.00455 50.3
30Q 3000K 0.4305 0.3935 0.00834 0.00408 53.2
30U 3000K 0.4274 0.3837 0.00834 0.00408 53.2
Copyright © 2015-2017 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, XLamp® and EasyWhite® are registered trademarks and the Cree logo is a
trademark of Cree, Inc. UL® and the UR logo are registered trademarks of UL LLC.
13
XLamp® CXB1820 LED
CREE EASYWHITE® BINS PLOTTED ON THE 1931 CIE COLOR SPACE (TJ 
2700 K
3000 K
3500 K
4000 K
4500 K
5000 K
5700 K
6500 K
0.31
0.32
0.33
0.34
0.35
0.36
0.37
0.38
0.39
0.40
0.41
0.42
0.43
0.44
0.29
0.30
0.31
0.32
0.33
0.34
0.35
0.36
0.37
0.38
0.39
0.40
0.41
0.42
0.43
0.44
0.45
0.46
0.47
0.48
CCy
CCx
ANSI C78.377 Quadrangle
EasyWhite 5-step
EasyWhite 3-step
EasyWhite 2-step
Copyright © 2015-2017 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, XLamp® and EasyWhite® are registered trademarks and the Cree logo is a
trademark of Cree, Inc. UL® and the UR logo are registered trademarks of UL LLC.
14
XLamp® CXB1820 LED
CREE PREMIUM COLOR BINS PLOTTED ON THE 1931 CIE COLOR SPACE (TJ 

2700K
3000K
3500K
4000K
4500K
L5A
0.34
0.35
0.36
0.37
0.38
0.39
0.40
0.41
0.42
0.43
0.44
0.35
0.36
0.37
0.38
0.39
0.40
0.41
0.42
0.43
0.44
0.45
0.46
0.47
0.48
CCy
CCx
ANSI C78.377 Quadrangle
35H
30H
27H
Copyright © 2015-2017 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, XLamp® and EasyWhite® are registered trademarks and the Cree logo is a
trademark of Cree, Inc. UL® and the UR logo are registered trademarks of UL LLC.
15
XLamp® CXB1820 LED
CREE PREMIUM COLOR BINS PLOTTED ON THE 1931 CIE COLOR SPACE (TJ 


3000 K
3500 K
L7B
L7C
0.37
0.38
0.39
0.40
0.41
0.42
0.43
0.44
0.41
0.42
0.43
0.44
0.45
0.46
CCx
ANSI C78.377 Quadrangle
3000K
3500K
30Q
30U
31Q
0.37
0.38
0.39
0.40
0.41
0.42
0.43
0.44
0.41
0.42
0.43
0.44
0.45
0.46
CCy
CCx
ANSI C78.377 Quadrangle
Copyright © 2015-2017 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, XLamp® and EasyWhite® are registered trademarks and the Cree logo is a
trademark of Cree, Inc. UL® and the UR logo are registered trademarks of UL LLC.
16
XLamp® CXB1820 LED
BIN AND ORDER CODE FORMATS
Bin codes and order codes are congured as follows:
Order Code Bin Code
SSSSSCC-HHHH-HHHGGRNNNNN
Series = CXB18
Internal code
CRI Specification
B = 70 CRI minimum
H = 80 CRI minimum
U = 90 CRI minimum
Z = 95 CRI minimum
Kit code
Vf class
N0 = 36-V class
Performance class
SSSSSCC-WWW-FF-GGR-AAAAA
Series = CXB18
Chromaticity bin
Vf class
N0 = 36-V class
Internal code
CRI Specification
B = 70 CRI minimum
H = 80 CRI minimum
U = 90 CRI minimum
Z = 95 CRI minimum
Flux bin
Performance class
MECHANICAL DIMENSIONS
Dimensions are in mm.
Tolerances unless otherwise
specied: ±.13
x° ±1°
Meaning of B1820N
B1820N = 36-V CXB1820
B1820N
Copyright © 2015-2017 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, XLamp® and EasyWhite® are registered trademarks and the Cree logo is a
trademark of Cree, Inc. UL® and the UR logo are registered trademarks of UL LLC.
17
XLamp® CXB1820 LED
THERMAL DESIGN
The CXB family of LED arrays can include over a hundred different LED die inside one package, and thus over a hundred different junction
temperatures (TJ). Cree has intentionally removed junction-temperature-based operating limits and replaced the commonplace maximum
TJ calculations with maximum ratings based on forward current (IF) and case temperature (Tc). No additional calculations are required to
ensure that the CXB LED is being operated within its designed limits. LES temperature measurement provides additional verication of
good thermal design. Please refer to page 2 for the Operating Limit specications.
There is no need to calculate for TJ inside the package, as the thermal management design process, specically from TSP to ambient
(Ta), remains identical to any other LED component. For more information on thermal management of Cree XLamp LEDs, please refer to
the Thermal Management application note. For CXB soldering recommendations and more information on thermal interface materials
(TIM), LES temperature measurement, and connection methods, please refer to the Cree XLamp CX Family LEDs soldering and handling
document. The CX Family LED Design Guide provides basic information on the requirements to use Cree XLamp CXB LEDs successfully
in luminaire designs.
To keep the CXB1820 LED at or below the maximum rated Tc, the case to ambient temperature
thermal resistance (R_c-a) must be at or below the maximum R_c-a value shown on the following
graph, depending on the operating environment. The y-axis in the graph is a base 10 logarithmic
scale.
As the gure at right shows, the R_c-a value is the sum of the thermal resistance of the TIM (R_tim)
plus the thermal resistance of the heat sink (R_hs).
R_j-c
Tc
R_tim
R_hs
Ta
R_j-c
Tc
R_c-a
Ta
CXB1820
0.01
0.10
1.00
10.00
100.00
350 450 550 650 750 850 950 1050
Maximum R_c-a
Current (mA)
Ta = 25 °C
Ta = 55 °C
Ta = 85 °C
Ta = 105 °C
Copyright © 2015-2017 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, XLamp® and EasyWhite® are registered trademarks and the Cree logo is a
trademark of Cree, Inc. UL® and the UR logo are registered trademarks of UL LLC.
18
XLamp® CXB1820 LED
NOTES
Measurements
The luminous ux, radiant power, chromaticity, forward voltage and CRI measurements in this document are binning specications only
and solely represent product measurements as of the date of shipment. These measurements will change over time based on a number
of factors that are not within Cree’s control and are not intended or provided as operational specications for the products. Calculated
values are provided for informational purposes only and are not intended as specications.

Please read the LED Reliability Overview for details of the qualication process Cree applies to ensure long-term reliability for XLamp
LEDs and details of Cree’s pre-release qualication testing for XLamp LEDs.
Lumen Maintenance
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 specic LM-80 data sets available for this LED, refer to the public LM-80 results document.
Please read the Long-Term Lumen Maintenance application note for more details on Cree’s lumen maintenance testing and forecasting.
Please read the Thermal Management application note for details on how thermal design, ambient temperature, and drive current affect
the LED junction temperature.
RoHS Compliance
The levels of RoHS 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 2011/65/EC (RoHS2), as
implemented January 2, 2013. RoHS Declarations for this product can be obtained from your Cree representative or from the Product
Ecology section of the Cree website.
REACh Compliance
REACh substances of very high concern (SVHCs) information is available for this product. Since the European Chemical Agency (ECHA)
has published notice of their intent to frequently revise the SVHC listing for the foreseeable future, please contact a Cree representative
to insure you get the most up-to-date REACh Declaration. REACh banned substance information (REACh Article 67) is also available upon
request.
UL® Recognized Component
Level 4 enclosure consideration. The LED package or a portion thereof has been investigated as a re and electrical enclosure per ANSI/
UL 8750.
Vision Advisory
WARNING: Do not look at an exposed lamp in operation. Eye injury can result. For more information about LEDs and eye safety, please
refer to the LED Eye Safety application note.
Copyright © 2015-2017 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, XLamp® and EasyWhite® are registered trademarks and the Cree logo is a
trademark of Cree, Inc. UL® and the UR logo are registered trademarks of UL LLC.
19
XLamp® CXB1820 LED
PACKAGING
Cree CXB1820 LEDs are packaged in trays of 20. Five trays are sealed in an anti-static bag and placed inside a carton, for a total of 100
LEDs per carton. Each carton contains 100 LEDs from the same performance bin.
Dimensions are in inches.
Tolerances: +.13
x° +1°
SIZE
TITLE
OF
REV.
SHEET
C
DRAWING NO.
DATE
DATE
DATE
CHECK
FINAL PROTECTIVE FINISH
MATERIAL
APPROVED
DRAWN BY
THIRD ANGLE PROJECTION
.X ± 0.1
X° ± 2 °
.XXX ± .010
.XX ± .03
.X ± .06
FOR SHEET METAL PARTS ONLY
.XX ± .05
.XXX ± .005
X° ± 1 °
UNLESS OTHERWISE SPECIFIED
DIMENSIONS ARE IN
MILLIMETERS & BEFORE FINISH.
TOLERANCE UNLESS SPECIFIED:
SCALE
A
B
C
D
123456
6 5 4 3 2 1
A
B
C
D
Phone (919) 361-4770
Fax (919) 313-5303
4600 Silicon Drive
Durham, N.C 27703
UNAUTHORIZED PERSON WITHOUT
THE WRITTEN CONSENT
MAY NOT BE COPIED, REPRODUCED OR DISCLOSED TO ANY
CONFIDENTIAL INFORMATION OF CREE, INC. THIS PLOT
CONTAINED WITHIN ARE THE PROPRIETARY AND
CREE CONFIDENTIAL. THIS PLOT AND THE INFORMATION
OF CREE INC.
NOTICE
5.875
5.875
.38
R.375
.875
.875
1/10.500
A
CXA15XX_DATASHEET_BAG2013
CXA15XX_DATASHEET
LABEL WITH CREE
BIN CODE, QTY, LOT#
LABEL WITH CREE
BIN CODE, QTY, LOT#
BAG
LABEL WITH CREE
BIN CODE, QTY, LOT#
PATENT LABEL
IS LOCATED ON UNDERSIDE OF
CARTON
UNLESS OTHERWISE NOTED ALL
TOLERANCES ARE AS FOLLOWS:
PART DRAWING
DWG.TITLE
SIZE
B
DO NOT
SCALE DWG.
FRACT ±1/64 X.X" ±.030 X.0mm ±.75mm
ANGLES ±0°-30' X.XX" ±.015 X.Xmm ±.30mm
DRAFT ±1° X.XXX" ±.005 X.XXmm ±.10mm
THIS DRAWING CONTAINS PROPRIETARY DESIGN INFORMATION
AND REMAINS ALONG WITH THE PRODUCT OR PRODUCTS
REPRESENTED HEREIN THE PROPERTY OF TEK PAK, INCORPORATED.
THIS DOCUMENT AND THE INFORMATION IT CONTAINS
MAY NOT BE COPIED, TRANSMITTED, OR USED BY ANY
THIRD PARTY WITHOUT THE EXPRESS WRITTEN APPROVAL
OF TEK PAK, INCORPORATED.
.75
7.875
7.125
R.375
1.125
1.125
.75
.38 .19
SCALE: 0.750
DWG. NO.
022489-00
SHEET 2 OF 2
DATE:
4-3-13
DR. BY:
KJS
CHK. BY:
REV DESC. DATE BY CHK.
SECTION C-C
.38
PATENT LABEL IS LOCATED
ON UNDERSIDE OF CARTON
LABEL WITH CREE BIN
CODE, QUANTITY, LOT #
SIZE
TITLE
OF
REV.
SHEET
C
DRAWING NO.
DATE
DATE
DATE
CHECK
FINAL PROTECTIVE FINISH
MATERIAL
APPROVED
DRAWN BY
THIRD ANGLE PROJECTION
.X ± 0.1
X° ± 2 °
.XXX ± .010
.XX ± .03
.X ± .06
FOR SHEET METAL PARTS ONLY
.XX ± .05
.XXX ± .005
X° ± 1 °
UNLESS OTHERWISE SPECIFIED
DIMENSIONS ARE IN
MILLIMETERS & BEFORE FINISH.
TOLERANCE UNLESS SPECIFIED:
SCALE
A
B
C
D
123456
6 5 4 3 2 1
A
B
C
D
Phone (919) 361-4770
Fax (919) 313-5303
4600 Silicon Drive
Durham, N.C 27703
UNAUTHORIZED PERSON WITHOUT
THE WRITTEN CONSENT
MAY NOT BE COPIED, REPRODUCED OR DISCLOSED TO ANY
CONFIDENTIAL INFORMATION OF CREE, INC. THIS PLOT
CONTAINED WITHIN ARE THE PROPRIETARY AND
CREE CONFIDENTIAL. THIS PLOT AND THE INFORMATION
OF CREE INC.
NOTICE
5.875
5.875
.38
R.375
.875
.875
1/10.500
A
CXA15XX_DATASHEET_BAG2013
CXA15XX_DATASHEET
BAG
LABEL WITH CREE BIN
CODE, QUANTITY, LOT #
LABEL WITH CREE BIN
CODE, QUANTITY, LOT #
LABEL WITH CREE BIN
CODE, QUANTITY, LOT #
PATENT LABEL IS LOCATED
ON UNDERSIDE OF COVER
Mouser Electronics
Authorized Distributor
Click to View Pricing, Inventory, Delivery & Lifecycle Information:
Cree, Inc.:
CXB1820-0000-000N0UR235H CXB1820-0000-000N0HS465E CXB1820-0000-000N0UR240G CXB1820-0000-
000N0HR427H CXB1820-0000-000N0HR440G CXB1820-0000-000N0UR235G CXB1820-0000-000N0HS235G
CXB1820-0000-000N0HR430H CXB1820-0000-000N0HS450G CXB1820-0000-000N0HR435G CXB1820-0000-
000N0HS250E CXB1820-0000-000N0HS240H CXB1820-0000-000N0HS457E CXB1820-0000-000N0HS250G
CXB1820-0000-000N0UQ430H CXB1820-0000-000N0UP427H CXB1820-0000-000N0HR230H CXB1820-0000-
000N0UR240H CXB1820-0000-000N0BS257E CXB1820-0000-000N0HS257E CXB1820-0000-000N0BS457E
CXB1820-0000-000N0BS440E CXB1820-0000-000N0BS240E CXB1820-0000-000N0UQ227H CXB1820-0000-
000N0UR450G CXB1820-0000-000N0HS265E CXB1820-0000-000N0UR440G CXB1820-0000-000N0UR440H
CXB1820-0000-000N0BS465E CXB1820-0000-000N0HR227H CXB1820-0000-000N0HS450E CXB1820-0000-
000N0UQ435H CXB1820-0000-000N0BS450E CXB1820-0000-000N0BS265E CXB1820-0000-000N0UQ435G
CXB1820-0000-000N0BS250E CXB1820-0000-000N0HR440H CXB1820-0000-000N0UR250G CXB1820-0000-
000N0HS240G CXB1820-0000-000N0HR435H CXB1820-0000-000N0HS235H CXB1820-0000-000N0UQ230H
CXB1820-0000-000N0HR427G CXB1820-0000-000N0UQ430G CXB1820-0000-000N0HR430G CXB1820-0000-
000N0UQ230G CXB1820-0000-000N0UQ227G CXB1820-0000-000N0UP427G CXB1820-0000-000N0HR227G
CXB1820-0000-000N0HR230G CXB1820-0000-000N0UQ440G CXB1820-0000-000N0UQ440H CXB1820-0000-
000N0UQ430Q CXB1820-0000-000N0UP430U CXB1820-0000-000N0UQ230Q CXB1820-0000-000N0UQ230U
CXB1820-0000-000N0UQ430U CXB1820-0000-000N0HR2L7B CXB1820-0000-000N0ZP227H CXB1820-0000-
000N0ZP2L7C CXB1820-0000-000N0ZP430H CXB1820-0000-000N0ZQ235H CXB1820-0000-000N0ZQ2L5A
CXB1820-0000-000N0UQ231Q