Ref.CE-P3326 09/15

2-3. Chromaticity Characteristics

Note : Citizen Electronics maintains chromaticity ( x, y ) +/-0.005

0.30

0.35

0.40

0.45

0.30

0.35

0.40

0.45

0.50

x

x-y chart CIE1931

4,000K

3,500K

3,000K

2,700K

5,000K

Black

Body

Locus

6,500K

ANSI

3-step

4

2700K

( 0.4577 , 0.4098 )

3000K

( 0.4339 , 0.4032 )

3500K

( 0.4078 , 0.3929 )

4000K

( 0.3818 , 0.3796 )

5000K

( 0.3446 , 0.3551 )

6500K

( 0.3123 , 0.3283 )

3000K

( 0.4339 , 0.4032 )

4000K

( 0.3818 , 0.3796 )

5000K

( 0.3446 , 0.3551 )

6500K

( 0.3123 , 0.3283 )

0.4149

0.00669

0.00285

0.3820

58.38

0.4373

0.3892

( Rated current, Tj=85C )

Color Region

Nominal

CCT

Center Point

( x, y )

Oval parameter

Major Axis

a

Minor Axis

b

Ellipse

Rotation Angle

θ

3-step MacAdam ellipse

0.00774

0.00411

57.28

0.00834

0.00408

53.17

0.00951

0.00417

52.97

0.00939

0.00402

54.00

0.00822

0.00354

59.62

Color Region

Nominal

CCT

Center Point

( x, y )

ANSI parameter

a

( x, y )

b

( x, y )

c

( x, y )

d

( x, y )

* 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)

0.3708

0.3550

0.3752

0.3375

0.3619

0.3366

0.3372

0.3514

0.3480

0.4003

0.4034

0.3737

0.3879

0.3671

0.3067

* 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.

0.3221

0.3221

0.3366

ANSI C78. 377:2011

0.3205

0.3375

0.3027

0.3205

0.3583

0.3895

0.4561

0.4259

0.4302

0.4171