Bio hue lamp

• US 10,434,280 B2
• Filed: 03/16/2016
• Issued: 10/08/2019
• Est. Priority Date: 03/19/2015
• Status: Active Grant

• Current Assignee: Signify Holding B.V. (Signify N.V.)
• Original Assignee: Signify Holding B.V. (Signify N.V.)
• Inventors: Peeters, Martinus Petrus Joseph, Broersma, Remy Cyrille, Sun, Yue Jun, Wegh, Rene Theodorus, Sekulovski, Dragan
• Primary Examiner(s): Bockelman, Mark
• Application Number:
  US15/558,396
• Publication Number:
  US 20180056027A1
• Time in Patent Office: 1,301 Days
• CPC Class Codes: A61M 2021/0044 by the sight sense
• CPC Class Codes: A61M 2021/0083 especially for waking up
• CPC Class Codes: A61M 21/02 for inducing sleep or relaxation, e.g. by direct nerve stimulation, hypnosis, analgesia for massage A61H; electrotherapy A61N, e.g. applying alternating or intermittent electric currents for producing anaesthesia A61N1/36021
• CPC Class Codes: A61N 2005/0663 Coloured light
• CPC Class Codes: A61N 5/0618 Psychological treatment
• CPC Class Codes: F21K 9/64 using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
• CPC Class Codes: F21V 9/30 Elements containing photoluminescent material distinct from or spaced from the light source shades F21V1/17; globes, bowls or cover glasses F21V3/08, F21V3/12; refractors F21V5/10; reflectors F21V7/26, F21V7/30; elements with provision for controlling the spectral properties or intensity F21V9/40
• CPC Class Codes: F21Y 2113/13 comprising an assembly of point-like light sources
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05B 45/20 Controlling the colour of the light
• CPC Class Codes: H05B 45/22 using optical feedback
• CPC Class Codes: H05B 47/16 by timing means
• CPC Class Codes: Y02B 20/40 Control techniques providing energy savings, e.g. smart controller or presence detection

Abstract

The invention provides a three-channel lighting apparatus with the option to support the human circadian rhythm. By choosing especially the blue LED and green phosphor, the range of biological activity that can be changed is optimized. By adjustment of the LED spectra a bigger range in melanopsin effectiveness factor, at the same CCT range (from daylight like CCT down to dimmed halogen), can be obtained.

Claims

1. A lighting apparatus configured to provide white light with a variable correlated color temperature, wherein the lighting apparatus comprises:

a first light source configured to provide first light source light, wherein the first light source light comprises blue light having a first light source dominant wavelength selected from the range of 400-460 nm, wherein the first light source is configured to irradiate a first luminescent material with said first light source light, wherein the first luminescent material is configured to convert part of the first light source light into first luminescent material light, wherein the first luminescent material light comprises one or more of green and yellow light, and wherein the first luminescent material light has a first luminescent material dominant wavelength;

a second light source configured to provide second light source light, wherein the second light source light comprises blue light having a second light source dominant wavelength selected from the range of 450-490 nm, wherein the second light source is configured to irradiate a second luminescent material with second light source light, and wherein the second luminescent material is configured to convert part of the second light source light into second luminescent material light, wherein the second luminescent material light comprises one or more of green and yellow light, and wherein the second luminescent material light has a second luminescent material dominant wavelength;

a third light source configured to provide red light source light;

a control unit, configured to independently control the first light source, the second light source and the third light source, to provide said white light having a variable correlated color temperature, wherein said white light comprises one or more of said first light source light, said first luminescent material light, and said red light source light and, and said second light source light, said second luminescent material light, and said red light source light;

wherein the second light source dominant wavelength is greater than the first light source dominant wavelength, and wherein the first luminescent material dominant wavelength is greater than the second luminescent material dominant wavelength.

2. The lighting apparatus according to claim 1, wherein the second light source dominant wavelength is less than 475 nm.

3. The lighting apparatus according to claim 1 wherein the first light source light has a dominant wavelength selected from the range of 430-450 nm, and wherein the second light source light has a dominant wavelength selected from the range of 450-475 nm, wherein the difference in dominant wavelengths is in the range of 15-30 nm, wherein the first luminescent material light of the first luminescent material has a dominant wavelength selected from the range of 550-590 nm, and wherein the second luminescent material light of the second luminescent material has a dominant wavelength selected from the range of 520-550 nm.

4. The lighting apparatus according to claim 1, wherein the first luminescent material and the second luminescent material comprises cerium doped garnet luminescent materials.

5. The lighting apparatus according to claim 4, wherein the first luminescent material and the second luminescent material comprise A₃B₅O₁₂:

Ce³⁺, wherein A is selected from the group consisting of Y, Gd, Tb and Lu, and wherein B is selected from the group consisting of Al, Ga and Sc, wherein the first luminescent material and the second luminescent material comprise Y and Lu and wherein for the first luminescent material the mole percentage of Y relative to A is larger than for the second luminescent material, and wherein for the second luminescent the mole percentage of Lu relative to A is larger than for the first luminescent material.

6. The lighting apparatus according to claim 1, wherein one or more of the first luminescent material and the second luminescent material comprise quantum dot luminescent materials.

7. The lighting apparatus according to claim 1 wherein the third light source comprises a third solid state light source configured to provide third solid state light source light, wherein the third solid state light source light comprises blue light, wherein the third solid state light source is configured to irradiate a third luminescent material with third solid state light source light, and wherein the third luminescent material is configured to convert part of the third solid state light source light into third luminescent material light, wherein the third luminescent material light comprises red light, and wherein the third luminescent material comprises MAlSiN₃:

Eu, wherein M comprises one or more elements selected from the group consisting of barium, strontium and calcium.

8. The lighting apparatus according to claim 1 wherein the third light source comprises a third solid state light source configured to provide red third solid state light source light.

9. The lighting apparatus according to claim 1, comprising a first LED package comprising the first light source and the first luminescent material and a second LED package comprising the second light source and the second luminescent material.

10. The lighting apparatus according to claim 1 wherein the control unit is configured to control the first light source, the second light source and the third light source as function of one or more of a time signal and an ambient light sensor.

11. The lighting apparatus according to claim 1 wherein the control unit is further configured to control the melanopsin effectiveness factor of the white light.

12. The lighting apparatus according to claim 11, wherein the control unit is further configured to control the melanopsin effectiveness factor as function of the correlated color temperature of the white light.

13. A method for using the lighting apparatus according to claim 1, comprising providing by the lighting apparatus white light tunable over a correlated color temperature range of at least 2000 K, and providing by the lighting apparatus a variable spectral power distribution in the blue range of the spectrum as function of the correlated color temperature.

14. The method according to claim 13, wherein the lighting apparatus is used for supporting bio rhythm.

15. The method according to claim 13, further comprising providing a first melanopsin effectiveness at a first correlated color temperature and a second melanopsin effectiveness at a second correlated color temperature, wherein the second correlated color temperature is larger than the first correlated color temperature, and wherein the ratio of the second melanopsin effectiveness to the first melanopsin effectiveness is equal to or larger than 3.5.