LIGHTING ARRANGEMENT

• US 20100220471A1
• Filed: 07/23/2008
• Published: 09/02/2010
• Est. Priority Date: 07/26/2007
• Status: Active Grant

• Current Assignee: Lemnis Lighting Patent Holding B.V.
• Original Assignee: Lemnis Lighting Patent Holding B.V.
• Inventors: ROOYMANS, Johannes Otto
• Granted Patent: US 8,388,174 B2
• Time in Patent Office: Days
• US Class Current: 362/231
• CPC Class Codes: F21S 8/086 with lighting device attached sideways of the standard, e.g. for roads and highways
• CPC Class Codes: F21V 19/001 the light sources being semiconductors devices, e.g. LEDs
• CPC Class Codes: F21V 29/51 using condensation or evaporation of a fluid, e.g. heat pipes
• CPC Class Codes: F21V 29/70 characterised by passive heat-dissipating elements, e.g. heat-sinks
• CPC Class Codes: F21V 7/09 with a combination of different curvatures
• CPC Class Codes: F21W 2131/103 of streets or roads
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

The invention relates to a lighting arrangement (1) for illuminating an area under mesopic conditions. The lighting arrangement has one or more LEDs (6) emitting substantially monochromatic light in a first wavelength region. The lighting arrangement further has one or more LEDs emitting (8) substantially-monochromatic light in a second wavelength region. Aforementioned combination of LEDs is such that, in use, the light provided by the lighting arrangement has an S/P-ratio greater than 2.

Claims

1. Lighting arrangement for illuminating an area under mesopic conditions comprising:

one or more LEDs emitting substantially monochromatic light in a first wavelength region;

one or more LEDs emitting substantially monochromatic light in a second wavelength region;

such that, in use, the light provided by the lighting arrangement has an S/P-ratio greater than 2.

2. The lighting arrangement according to claim 1, wherein the lighting arrangement has an S/P-ratio greater than 2.3.

3. The lighting arrangement according to claim 1, wherein the lighting arrangement has an S/P-ratio greater than 2.5.

4. The lighting arrangement according to any one of claims 1-3, wherein the first wavelength region has a range of 500-525 nm, and the second wavelength region has a range of 580-625 nm.

5. The lighting arrangement according to any one of claims 1-3, wherein the first wavelength region has a range of 500-525 nm, and the second wavelength region has a range of 600-640 nm.

6. The lighting arrangement according to any one of claims 1-5, wherein, in use, emitted light in the first wavelength region in combination with emitted light in the second wavelength region results in light with chromaticity x-coordinates between 0.290 and 0.330, and with chromaticity y-coordinates between 0.550 and 0.590.

7. The lighting arrangement according to any one of claims 1-5, wherein, in use, emitted light in the first wavelength region in combination with emitted light in the second wavelength region results in light with chromaticity x-coordinates between 0.385 and 0.425, and with chromaticity y-coordinates between 0.490 and 0.530.

8. The lighting arrangement according to any one of claims 1-5, wherein, in use, a ratio of the light intensity of the emitted light in the first wavelength region with respect to the light intensity of the emitted light in the second wavelength region equals 3:

2.

9. The lighting arrangement according to any one of claims 1-5, wherein, in use, a light intensity of the emitted light in the first wavelength region equals a light intensity of the emitted light in the second wavelength region.

10. The lighting arrangement according to any one of the preceding claims, wherein the S/P-ratio is smaller than 3.7.

11. The lighting arrangement according to any one of the preceding claims, wherein the arrangement further comprises one or more LEDs emitting substantially monochromatic light in a third wavelength region.

12. The lighting arrangement according to claim 10, wherein the third wavelength region has a range of 460-490 nm.

13. The lighting arrangement according to claim 10 or 11, wherein, in use, emitted light in the first wavelength region in combination with emitted light in the second wavelength region and emitted light in the third wavelength region results in light with chromaticity x-coordinates between 0.220 and 0.260, and with chromaticity y-coordinates between 0.300 and 340.