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

Claim 4:
5. The light indicator according to claim 1, wherein,
the first light indicator element comprising a first sensing area, wherein the first light reflecting element being configured to reflect at least part of light illuminating the first sensing area having one or more wavelengths selected from the wavelength range of an absorption band of melanopsin in the visible wavelength range and configured to absorb at least part of light illuminating the first sensing area having one or more wavelengths in the visible wavelength range outside the wavelength range of the absorption band of melanopsin in the visible wavelength range;
the second light indicator element comprising a second sensing area, wherein the second light reflecting element being configured to reflect at least part of light illuminating the second sensing area having one or more wavelengths selected from the wavelength range of an absorption band of melanopsin in the visible wavelength range and configured to absorb at least part of light illuminating the second sensing area having one or more wavelengths in the visible wavelength range outside the wavelength range of the absorption band of melanopsin in the visible wavelength range;, wherein
first light indicator element and the second light indicator element are chosen such that:, (i) under illumination with first light with a predefined first spectral power distribution, including first spectral power in the wavelength range of an absorption band of melanopsin in the visible wavelength range, the intensities of the reflections of the first light from the first sensing area and the second sensing area are the same;, (ii) under illumination with second light, including second spectral power in the wavelength range of an absorption band of melanopsin in the visible wavelength range, wherein the second spectral power is larger than the first spectral power, the intensity of the reflection of the second light from the first sensing area is larger than from the second sensing area; and, (iii) under illumination with third light, including third spectral power in the wavelength range of an absorption band of melanopsin in the visible wavelength range, wherein the third spectral power is smaller than the first spectral power, the intensity of the reflection of the third light from the first sensing area is smaller than from the second sensing area.