Sleepy light
AssigneeSignify Holding B.V.
InventorsMarius Leendert Trouwborst, Berent Willem Meerbeek
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Abstract
The invention provides a lighting device (100) comprising a first light source (10) and a second light source (20), a control system (50) configured to control the first light source (10) and the second light source (20), wherein the first light source (10) is configured to provide first light source light (11) having a correlated color temperature (CCT) of at maximum 3000 K and a color rendering index (CRI) of at least 75, and wherein the second light source (20) is configured to provide second light source light (21) having a dominant wavelength selected from the range of (575-780) nm and having a color rendering index of at maximum (70).
Claims15
A lighting device comprising
- a first light source configured to provide first light source light,
- a second light source configured to provide second light source light and
- a control system configured to control the first light source and the second light source to provide said first light source light and second light source light respectively, wherein
- the first light source light and the second light source light each have a melanopsin effectiveness factor (MEF) of a maximum 0.40 and wherein MEF is defined as
- MEF
- =
- 1.22
- ·
- ∑
- λ
- =
- 380
-
-
- nm
- λ
- =
- 780
-
-
- nm
-
- (
- SPD
-
- (
- λ
- )
- ·
- m
-
- (
- λ
- )
- )
- ∑
- λ
- =
- 380
-
-
- nm
- λ
- =
- 780
-
-
- nm
-
- (
- SPD
-
- (
- λ
- )
- ·
- V
-
- (
- λ
- )
- )
- wherein SPD(λ) defines the spectral power distribution of the light source light emitted by the respective light source,
- wherein m(λ) is the normalized melanopic sensitivity function and
- wherein V(λ) is the normalized photopic sensitivity function, and wherein
- the first light source light and the second light source light have a color rendering index (CRI), the difference between the CRI of the first light source light and the CRI of the second light source light is at least 15 CRI units, and wherein
- at least the first light source is arranged to provide the first light source light having a maximum ratio of the total number of photons in the wavelength range of 440-530 nm to the total number of photons in the wavelength range 380-780 nm of 0.2.
Dependencies are inferred from the claim text.