Patent ID: 11879774
Assignee: SIGNIFY HOLDING B.V.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 8:
9. A kit of parts comprising:
a light indicator for use in evaluating melanopsin active radiation of light, the light indicator comprising a first light indicator element comprising a first light reflective element and a second light indicator element comprising a second light reflective element, the light reflecting elements having different wavelength dependencies of the spectral reflectivity, wherein the light reflecting elements are selected to provide the same intensity ratio of reflected light of two or more different types of light irradiating on the light indicator elements, wherein the two or more different types of light have different spectral power distributions in the visible wavelength range but have the same ratios of the melanopic flux to the luminous flux, wherein the ratio of the melanopic flux to the luminous flux of light is defined as

MEF=1.22(Σ(λ=380){circumflex over ( )}780SPD(λ)m(λ)Δλ)/(Σ(λ=380){circumflex over ( )}780SPD(λ)V(λ)Δλ)   (Eq. 1), wherein SPD(λ) is the spectral power distribution of the light, m(λ) is the melanopic sensitivity function, and V(λ) is the photopic sensitivity, and wherein the light reflecting elements are further selected to provide a different intensity ratio of reflected light of two or more different types of light irradiating on the light indicator elements, wherein the two or more different types of light have different ratios of the melanopic flux to the luminous flux; and
reference information or a reference to such reference information which is available on one or more of the light indicator, a data carrier, and another tangible element, and wherein the reference information contains information allowing one or more of a qualitative analysis and a quantitative analysis of a ratio of the melanopic flux and the luminous flux of light on the light indicator elements, of the light indicator.