Correlated colour Specifies the colour ‘shade’ of white CCT helps consumers select the ANSI C78.377 Follow ANSI C78.377, excluding flexible CCT temperature (CCT) in light emitted by a lamp, relating to appropriate product depending on defines target Kelvin (K) the colour of light from a reference their light colour preference and colour source when heated to a particular match light colour across different temperatures temperature, measured in Kelvin. manufacturer lighting products. This and allowable Spectrally, light sources which appear way, when lighting products from tolerances a “warm” white contain more red different manufacturers are used in (below) light content and are at lower Kelvin the same space there is not an (2700-3500 K), while those unintended assortment of light IEC 62612 (Self appearing “cool” white contain more sources with some appearing a ballasted LED) blue (4000-6500+ K) to create their coolish white and others a warmish appearance. white. IEC 62717 (LED modules) Colour spatial The maximum allowable variation in Ensures that there are no extreme, Energy Star To be considered only for inclusion uniformity the colour appearance of a light perceptible colour variations in light Product in the standard. source when viewed from different output of a lamp. (Colour blotches are Specification Directional lamps: The variation of angles. often perceptible in poor quality for Lamps V1.1 chromaticity across the beam and products) field angles shall be within 0.007 from the weighted average point on the CIE 1976 (u'v') diagram
Correlated colour temperature (CCT) in Kelvin (K) Specifies the colour ‘shade’ of white light emitted by a lamp, relating to the colour of light from a reference source when heated to a particular temperature, measured in Kelvin. Spectrally, light sources which appear a “warm” white contain more red light content and are at lower Kelvin (2700-3500 K), while those appearing “cool” white contain more blue (4000-6500+ K) to create their appearance. CCT helps consumers select the appropriate product depending on their light colour preference and match light colour across different manufacturer lighting products. This way, when lighting products from different manufacturers are used in the same space there is not an unintended assortment of light sources with some appearing a coolish white and others a warmish white. ANSI C78.377 defines target colour temperatures and allowable tolerances (below) IEC 62612 (Self ballasted LED) IEC 62717 (LED modules) Follow ANSI C78.377, excluding flexible CCT Colour spatial uniformity The maximum allowable variation in the colour appearance of a light source when viewed from different angles. Ensures that there are no extreme, perceptible colour variations in light output of a lamp. (Colour blotches are often perceptible in poor quality products) Energy Star Product Specification for Lamps V1.1 To be considered only for inclusion in the standard. Directional lamps: The variation of chromaticity across the beam and field angles shall be within 0.007 from the weighted average point on the CIE 1976 (u'v') diagram
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