CLU026-1204C1 Datasheet, PDF (4/15 Pages) CITIZEN ELECTRONICS CO., LTD. – CITILED COB Series Standard Type

2-3. Chromaticity Characteristics
Color Region
Nominal
CCT
3-step MacAdam ellipse
2700K
3000K
3500K
4000K
5000K
6500K
Center Point
( x, y )
( 0.4577 , 0.4098 )
( 0.4339 , 0.4032 )
( 0.4078 , 0.3929 )
( 0.3818 , 0.3796 )
( 0.3446 , 0.3551 )
( 0.3123 , 0.3283 )
Major Axis
a
0.00774
0.00834
0.00951
0.00939
0.00822
0.00669
( Rated current, Tj=85C )
Oval parameter
Minor Axis
b
0.00411
Ellips e
Rotation Angle
θ
57.28
0.00408
53.17
0.00417
52.97
0.00402
54.00
0.00354
59.62
0.00285
58.38
Color Region
ANSI C78. 377:2011
Nominal
CCT
3000K
4000K
5000K
Center Point
( x, y )
( 0.4339 , 0.4032 )
( 0.3818 , 0.3796 )
( 0.3446 , 0.3551 )
ANSI parameter
a
( x, y )
b
( x, y )
c
( x, y )
d
( x, y )
0.4561 0.4259 0.4302 0.4171 0.4149 0.3820 0.4373 0.3892
0.4003 0.4034 0.3737 0.3879 0.3671 0.3583 0.3895 0.3708
0.3550 0.3752 0.3375 0.3619 0.3366 0.3372 0.3514 0.3480
* Color region stay within MacAdam 3-step ellipse from the chromaticity center.
* The chromaticity center refers to ANSI C78.377:2011.
Please refer to ANSI C78. 377 for the chromaticity center.
* θ is the angle between the major axis of the ellipse and the x-axis, and a and b are the major and minor semi-axes of an ellipse.
(Ref. IEC 60081:1997 AnnexD)
x-y chart CIE1931
0.45
2,700K
3,000K
3,500K
0.40
4,000K
5,000K
Black
Body
Locus
0.35 _6,500K
0.30
0.30
0.35
0.40
x
Note : Citizen Electronics maintains chromaticity ( x, y ) +/-0.005
ANSI
3-s tep
0.45
0.50
4
Ref.CE-P3079 04/15