CLU048-1818C4 Datasheet, PDF (4/15 Pages) CITIZEN ELECTRONICS CO., LTD. – CITILED COB Series Standard Type Ra90 Model

2-3. Chromaticity Characteristics
Color Region
Nominal
CCT
3-step MacAdam ellipse
2700K
3000K
3500K
4000K
Center Point
( x, y )
( 0.4577 , 0.4098 )
( 0.4339 , 0.4032 )
( 0.4078 , 0.3929 )
( 0.3818 , 0.3796 )
Major Axis
a
0.00774
0.00834
0.00951
0.00939
( Rated current, Tj=85C )
Oval parameter
Minor Axis
b
0.00411
Ellipse
Rotation Angle
θ
57.28
0.00408
53.17
0.00417
52.97
0.00402
54.00
* Color region stay within MacAdam 3-s tep ellips e 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)
x-y chart CIE1931
0.45
2,700K
3,000K
3,500K
0.40
4,000K
Black
Body
Locus
0.35
0.30
0.30
0.35
0.40
x
Note : Citizen Electronics maintains chromaticity ( x, y ) +/-0.005
4
3-step
0.45
0.50
Ref.CE-P3544 02/16