Ref.CE-P3126 04/15

Preliminary

2-3. Chromaticity Characteristics

4

3-step MacAdam ellipse

2700K

( 0.4577 , 0.4098 )

* Color region stays within MacAdam 3-step ellipse from 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.

( Tc=25C )

Color Region

Nominal

CCT

Center Point

( x, y )

Oval parameter

Major Axis

a

Minor Axis

b

Ellipse

Rotation Angle

θ

(Ref. IEC 60081:1997 AnnexD)

0.00774

0.00411

57.28

Color Region

Nominal

CCT

Center Point

( x, y )

Coordinates of Four Corners

7-Step Quadrangles

0.5472

0.3901

1800K

( 0.5494 , 0.4082 )

x

Point 4

0.5272

0.3893

Point 1

Point 2

Point 3

y

0.5739

0.4276

0.5518

0.4270

0.36

0.41

0.46

0.42

0.47

0.52

0.57

x

Color region

Center point

2700K(3step)

B.B. Locus

2,700K

1,800K