Lighting arrangement

• US 8,388,174 B2
• Filed: 07/23/2008
• Issued: 03/05/2013
• Est. Priority Date: 07/26/2007
• Status: Expired due to Fees

• Current Assignee: Lemnis Lighting Patent Holding B.V.
• Original Assignee: Lemnis Lighting Patent Holding B.V.
• Inventors: Rooymans, Johannes Otto
• Primary Examiner(s): DUNWIDDIE, MEGHAN K
• Application Number:
  US12/670,683
• Publication Number:
  US 20100220471A1
• Time in Patent Office: 1,686 Days
• Field of Search: 362230-231, 362293-294, 362/545, 362/800
• 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, wherein the S/P-ratio refers to the ratio between scotopic efficacy V′

(λ

) and photopic efficacy V(λ

), and wherein emitted light in the first wavelength region in combination with emitted light in the second wavelength region results in light with chromaticity x-coordinates in the CIE 1931 color space chromaticity diagram between 0.290 and 0.330, and with chromaticity y-coordinates in the CIE 1931 color space chromaticity diagram between 0.550 and 0.590.

2. The lighting arrangement according to claim 1, wherein the SIP-ratio is smaller than 3.7.

3. 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, wherein the S/P-ratio refers to the ratio between scotopic efficacy V′

(λ

) and photopic efficacy V(λ

), and wherein emitted light in the first wavelength region in combination with emitted light in the second wavelength region results in light with chromaticity x-coordinates in the CIE 1931 color space chromaticity diagram between 0.385 and 0.425, and with chromaticity y-coordinates in the CIE 1931 color space chromaticity diagram between 0.490 and 0.530.

4. The lighting arrangement according to claim 3, wherein the S/P-ratio is smaller than 3.7.

5. 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;

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

such that, in use, the light provided by the lighting arrangement has an S/P-ratio greater than 2, wherein the S/P-ratio refers to the ratio between scotopic efficacy V′

(λ

) and photopic efficacy V(λ

), and wherein 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 in the CIE 1931 color space chromaticity diagram between 0.220 and 0.260, and with chromaticity y-coordinates in the CIE 1931 color space chromaticity diagram between 0.300 and 0.340.

6. The lighting arrangement according to claim 5, wherein the third wavelength region has a range of 460-490 nm.