2-3. Chromaticity Characteristics
( Rated current, Tj=85C )
Oval parameter
Nominal
CCT
Center Point
Ellipse
Rotation Angle
Color Region
Major Axis
a
Minor Axis
b
( x, y )
θ
0.00774
0.00834
0.00951
0.00939
0.00822
0.00669
0.00411
0.00408
0.00417
0.00402
0.00354
0.00285
57.28
2700K
3000K
3500K
4000K
5000K
6500K
( 0.4577 , 0.4098 )
( 0.4339 , 0.4032 )
( 0.4078 , 0.3929 )
( 0.3818 , 0.3796 )
( 0.3446 , 0.3551 )
( 0.3123 , 0.3283 )
53.17
52.97
54.00
59.62
58.38
3-step MacAdamellipse
ANSIparameter
Nominal
CCT
Center Point
( x, y )
Color Region
a
b
c
d
( x, y )
( x, y )
( x, y )
( 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
3000K
4000K
5000K
( 0.4339 , 0.4032 )
( 0.3818 , 0.3796 )
( 0.3446 , 0.3551 )
ANSI C78. 377:2011
* Color region stay within MacAdam 3-step ellipse fromthe 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
Black
Body
Locus
4,000K
0.40
0.35
0.30
5,000K
6,500K
ANSI
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-P3076 04/15