Ref.CE-P3122 04/15

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

Black

Body

Locus

3-step

4

2700K

( 0.4577 , 0.4098 )

3000K

( 0.4339 , 0.4032 )

3500K

( 0.4078 , 0.3929 )

4000K

( 0.3818 , 0.3796 )

( Rated current, Tj=85C )

Color Region

Nominal

CCT

Center Point

( x, y )

Oval parameter

Major Axis

a

Minor Axis

b

Ellipse

Rotation Angle

θ

* 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)

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