2-3. Chromaticity Characteristics
( Rated current, Tj=85C )
Oval parameter
Nominal
CCT
Center Point
( x, y )
Major Axis
a
Minor Axis
b
Ellipse
Rotation Angle
θ
Color Region
3-step
2-step
3-step
2-step
0.00774
0.00834
0.00951
0.00939
0.00822
0.00669
0.00516
0.00411
0.00408
0.00417
0.00402
0.00354
0.00285
0.00274
57.28
53.17
52.97
54.00
59.62
58.38
2,700K
3,000K
3,500K
4,000K
5,000K
6,500K
( 0.4577 , 0.4098 )
( 0.4339 , 0.4032 )
( 0.4078 , 0.3929 )
( 0.3818 , 0.3796 )
( 0.3446 , 0.3551 )
( 0.3123 , 0.3283 )
0.00556
0.00634
0.00626
0.00548
0.00446
0.00272
0.00278
0.00268
0.00236
0.00190
3-step MacAdamEllipse.
2-step MacAdamEllipse.
ANSIparameter
Nominal
CCT
Center Point
( x, y )
Color Region
a
b
c
d
( x, y )
( x, y )
( x, y )
( x, y )
3,000K
4,000K
5,000K
( 0.4339 , 0.4032 )
( 0.3818 , 0.3796 )
( 0.3446 , 0.3551 )
0.4561 0.4259
0.4302
0.4171
0.3879
0.3619
0.4149
0.3820
0.3583
0.3372
0.4373
0.3895
0.3514
0.3892
0.3708
0.3480
ANSI C78. 377:2011
0.4003
0.3550
0.4034
0.3752
0.3737
0.3375
0.3671
0.3366
* Color region stay within 3-step / 2-step MacAdamellipse fromthe chromaticity center.
* The chromaticity center refers to ANSI C78.377:2011.
* 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
Black
Body
2,700K
3,000K
3,500K
Locus
4,000K
0.40
5,000K
6,500K
0.35
ANSI
2-step
3-step
0.30
0.30
0.35
0.40
0.45
0.50
x
Note : Citizen Electronics maintains chromaticity ( x, y ) +/-0.005
4
Ref.CE-P3786 11/16
CITIZEN [ CITIZEN ELECTRONICS CO., LTD. ]
