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
0.00760
0.00669
0.00516
0.00411
0.00408
0.00417
0.00402
0.00354
0.00296
0.00285
0.00274
57.28
53.17
52.97
54.00
59.62
59.46
58.38
2,700K
3,000K
3,500K
4,000K
5,000K
5,700K
6,500K
( 0.4577 , 0.4098 )
( 0.4339 , 0.4032 )
( 0.4078 , 0.3929 )
( 0.3818 , 0.3796 )
( 0.3446 , 0.3551 )
( 0.3287 , 0.3417 )
( 0.3123 , 0.3283 )
0.00556
0.00634
0.00626
0.00548
0.00507
0.00446
0.00272
0.00278
0.00268
0.00236
0.00198
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
Locus
3,500K
4,000K
0.40
0.35
0.30
5,000K
5,700K
6,500K
ANSI
2-step
3-step
0.30
0.35
0.40
0.45
0.50
x
Note : Citizen Electronics maintains chromaticity ( x, y ) +/-0.005
4
Ref.CE-0080P-201710