Sleepy light

• US 10,257,902 B2
• Filed: 08/11/2016
• Issued: 04/09/2019
• Est. Priority Date: 08/13/2015
• Status: Active Grant

• Current Assignee: Signify Holding B.V. (Signify N.V.)
• Original Assignee: Signify Holding B.V. (Signify N.V.)
• Inventors: Trouwborst, Marius Leendert, Meerbeek, Berent Willem
• Primary Examiner(s): Hammond, Dedei K
• Assistant Examiner(s): Chai, Raymond R
• Application Number:
  US15/751,599
• Publication Number:
  US 20180235041A1
• Time in Patent Office: 971 Days
• CPC Class Codes: H05B 45/20 Controlling the colour of the light
• CPC Class Codes: H05B 45/22 using optical feedback

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).

Claims

1. 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

2. The lighting device according to claim 1, wherein the difference between the CRI of the first light source light and the CRI of the second light source light is at least 20 CRI units.

3. The lighting device according to claim 1, wherein the CRI of the second light source light is equal to or smaller than 60 CRI units.

4. The lighting device according to claim 1, wherein said second light source is configured to provide said second light source light, having a 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 of 380-780 nm of at maximum 0.01.

5. The lighting device according to claim 1, wherein said first light source light has a MEF value MEF₁ and wherein said second light source light has a MEF value MEF₂, wherein MEF₂<

MEF₁.

6. The lighting device according to claim 5, wherein said first light source and said second light source are configured to provide said first light source light and said second light source light, respectively, having a difference in MEF of at least 0.05.

7. The lighting device according to claim 6, wherein said first light source is configured to provide said first light source light having said MEF₁ value selected from the range of 0.2-0.4, and wherein said second light source is configured to provide said second light source light having said MEF₂ value selected of at maximum 0.15.

8. The lighting device according to claim 1, wherein the first light source comprises one or more solid state light sources, and wherein the second light source comprises one or more solid state light sources, wherein the second light source comprises at least a solid state light source configured to provide amber light.

9. The lighting device according to claim 1, comprising a light exit window configured to transmit at least part of said first light source light and said second light source light.

10. The lighting device according to claim 1, wherein the lighting device is configured to provide lighting device light comprising one or more of said first light source light and said second light source light, wherein the control system is configured to control one or more of an intensity of the lighting device light and a spectral composition of said lighting device light as function of one or more of (i) an ambient light sensor signal, (ii) a motion sensor signal, (iii) a sound sensor signal, (iv) a timer signal, (v) a date signal, and (vi) a user interface signal.

11. The lighting device according to claim 1, further comprising a user interface wherein the user interface comprises one or more of a remote user interface and a user interface integrated in a lighting unit comprising said first light source and said second light source.

12. A lighting system comprising:

the lighting device according to claim 1, wherein the lighting device is configured to provide lighting device light comprising one or more of said first light source light and said second light source light, and

a user interface functionally coupled to the control system, wherein the control system is configured to control one or more of an intensity of the lighting device light and a spectral composition of said lighting device light as function of a user interface signal.

13. The lighting system of claim 12, further comprising a timer functionally coupled to the control system, wherein the control system is configured to control one or more of an intensity of the lighting device light and a spectral composition of said lighting device light as function of a timer signal or a date signal.

14. The lighting system of claim 12, further comprising a sensor functionally coupled to the control system, wherein the control system is configured to control one or more of an intensity of the lighting device light and a spectral composition of said lighting device light as function of one or more of (i) an ambient light sensor signal, (ii) a motion sensor signal and (iii) a sound sensor signal.

15. The lighting device according to claim 1, wherein the first light source light has 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 light has a dominant wavelength selected from the range of 575-780 nm and a color rendering index of at maximum 70.