LIGHTING SYSTEM FOR CREATING A BIOLOGICAL EFFECT

• US 20100171441A1
• Filed: 05/23/2008
• Published: 07/08/2010
• Est. Priority Date: 05/25/2007
• Status: Active Grant

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Schlangen, Lucas Josef Maria, Kok, Gregorius Wilhelmus Maria
• Granted Patent: US 8,378,574 B2
• Time in Patent Office: Days
• US Class Current: 315/294
• CPC Class Codes: A61M 2021/0044 by the sight sense
• CPC Class Codes: A61M 2021/005 images, e.g. video
• CPC Class Codes: A61M 21/00 Other devices or methods to cause a change in the state of consciousness; Devices for producing or ending sleep by mechanical, optical, or acoustical means, e.g. for hypnosis
• CPC Class Codes: A61N 5/0618 Psychological treatment
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 3/3413 Details of control of colour illumination sources
• CPC Class Codes: H05B 45/20 Controlling the colour of the light
• 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

A lighting system for creating a biological effect induced by light. The biological effect is a different effect than vision. The lighting system comprises a light source (1) to generate light with a varying spectrum, and a driver (2) to drive the light source (1) to successively in time: (i) generate a first spectrum (S1) during a first period in time (T1), (ii) change the first spectrum (S1) into a second spectrum (S2) during a second period in time (T2), wherein the second spectrum (S2) has the biological effect, and (iii) maintain the second spectrum (S2) during a third period in time (T3). The duration of the second period in time (T2) is selected in a range from 5 seconds to 30 minutes. The first spectrum (S1) may not have the biological effect or may have the biological effect to a smaller extent than the second spectrum (S2).

Claims

1. A lighting system for creating a biological effect induced by light, the biological effect being a different effect than vision, and the lighting system comprising:

at least one light source (1) for generating light with a varying spectrum, and

at least one driver (2) for driving the lighting system (1) to, successively in time;

generate a first spectrum (S1) during a first period in time (T1),

change the first spectrum (S1) into a second spectrum (S2) during a second period in time (T2), the second spectrum (S2) having the biological effect, and

continue the second spectrum (S2) during a third period in time (T3), wherein a duration of the second period in time (T2) is selected in a range from 5 seconds to 30 minutes.

2. A lighting system as claimed in claim 1, wherein the first spectrum (S1) has a further biological effect being smaller than the biological effect of the second spectrum (S2).

3. A lighting system as claimed in claim 1, wherein the first spectrum (S1) has no biological effect.

4. A lighting system as claimed in claim 1, wherein the second spectrum (S2) comprises the first spectrum (S1) at an intensity lower than its intensity during the first period in time (T1).

5. A lighting system as claimed in claim 1, further comprising a third spectrum selected for masking a transition from the first spectrum (S1) into the second spectrum (S2) during at least part of the second period in time (T2).

6. A lighting system as claimed in claim 1, wherein the light having the first spectrum (S1) has a red color and the light having the second spectrum (S2) has a blue color.

7. A lighting system as claimed in claim 6, wherein the first spectrum (S1) is limited to a wavelength in a range from 600 to 760 nm and the second spectrum (S2) is limited to a wavelength in a range from 440 to 520 nm.

8. A lighting system as claimed in claim 1, wherein the first spectrum (S1) has a dominant component at a wavelength of 680 nm and the second spectrum (S2) has a dominant component at a wavelength of 480 nm.

9. A lighting system as claimed in claim 6, wherein the first spectrum (S1) is a white light with a first color temperature and the second spectrum (S2) is a white light with a second color temperature being higher than the first color temperature.

10. A lighting system as claimed in claim 1, wherein the driver (2) is constructed for further repeating the sequence of the first period in time (T1), the second period in time (T2), and the third period in time (T3) a predetermined number of times.

11. A lighting system as claimed in claim 1, wherein the driver (2) is constructed for further repeating the sequence of the first period in time (T1) and the third period in time (T3).

12. A lighting system as claimed in claim 1, wherein the driver (2) is constructed for gradually decreasing an intensity (IN) of the first spectrum (S1) and gradually increasing an intensity (IN) of the second spectrum (S2).

13. A lighting system as claimed in claim 12, wherein the driver (2) is constructed for keeping a total luminance or a total brightness of the first spectrum (S1) and the second spectrum (S2) constant during the second period in time (T2).

14. (canceled)

15. A method of driving a light source (1), the method comprising successively the steps of:

generating (1, 2) a first spectrum (S1) during a first period in time (T1),

changing (1, 2) the first spectrum (S1) into a second spectrum (S2) during a second period in time (T2), the second spectrum (S2) having a biological effect induced by light generated by the light source (1), the biological effect being a different effect than vision, and

continuing (1, 2) the second spectrum (S2) during a third period in time (T3), wherein a duration of the second period in time (T2) is selected in a range from 5 seconds to 30 minutes.