SOLID STATE LIGHT EMITTING DEVICES INCLUDING ADJUSTABLE SCOTOPIC / PHOTOPIC RATIO
First Claim
1. A light emitting apparatus comprising:
- a first LED component arranged to generate a first spectral output including a first ratio of scotopic to photopic light (first S/P ratio), and including a first chromaticity; and
a second LED component arranged to generate a second spectral output including a second ratio of scotopic to photopic light (second S/P ratio), and including a second chromaticity;
wherein the first chromaticity and the second chromaticity differ by no more than seven MacAdam ellipses; and
wherein the first S/P ratio is at least 20% greater than the second S/P ratio.
4 Assignments
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Accused Products
Abstract
Solid state light emitting devices include multiple LED components separately arranged to generate spectral output having different ratios of scotopic to photopic light (S/P ratios) but similar chromaticities preferably within seven MacAdam ellipses. A light emitting device may be controlled to permit transitioning between different modes of operation of multiple LED components, with aggregated output of different modes having different S/P ratios but similar chromaticities. Multiple LED components of a light emitting device may be simultaneously controlled with different dimming profiles to effect increased color rendering at maximum emissive output of the apparatus, and to effect increased aggregated S/P ratio at minimum emissive output of the device.
36 Citations
46 Claims
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1. A light emitting apparatus comprising:
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a first LED component arranged to generate a first spectral output including a first ratio of scotopic to photopic light (first S/P ratio), and including a first chromaticity; and a second LED component arranged to generate a second spectral output including a second ratio of scotopic to photopic light (second S/P ratio), and including a second chromaticity; wherein the first chromaticity and the second chromaticity differ by no more than seven MacAdam ellipses; and wherein the first S/P ratio is at least 20% greater than the second S/P ratio. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A light emitting apparatus comprising:
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a first LED component arranged to generate a first spectral output including a first ratio of scotopic to photopic light (first S/P ratio); a second LED component arranged to generate a second spectral output including a second ratio of scotopic to photopic light (second S/P ratio) that differs from the first S/P ratio; and at least one control circuit arranged to permit transitioning between at least two predefined modes of operating the first LED component and the second LED component; wherein; the at least two predefined modes include a first operating mode and a second operating mode; the first operating mode is arranged to generate aggregated emissions from the light emitting apparatus according to a first aggregated emission profile including a first aggregated ratio of scotopic to photopic light (first aggregated S/P ratio) and a first aggregated chromaticity; the second operating mode is arranged to generate aggregated emissions from the light emitting apparatus according to a second aggregated emission profile including a second aggregated ratio of scotopic to photopic light (second aggregated S/P ratio) and a second aggregated chromaticity; the first aggregated S/P ratio is at least 20% greater than the second aggregated S/P ratio; and the first aggregated chromaticity differs from the second aggregated chromaticity by no more than seven MacAdam ellipses. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A light emitting apparatus comprising:
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a first LED component arranged to generate a first spectral output including a first ratio of scotopic to photopic light (first S/P ratio); a second LED component arranged to generate a second spectral output including a second ratio of scotopic to photopic light (second S/P ratio) that differs from the first S/P ratio; and at least one control circuit arranged to control operation of the first LED component according to a first dimming profile and to simultaneously control operation of the second LED component according to a second dimming profile, wherein the first dimming profile differs from the second dimming profile to effect increased color rendering index of aggregated emissions of the light emitting apparatus at maximum emissive output of the light emitting apparatus, and to effect increased aggregated S/P ratio of aggregated emissions of the light emitting apparatus at minimum emissive output of the light emitting apparatus. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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42. A light emitting apparatus comprising:
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a first LED component arranged to generate a first spectral output including a first ratio of scotopic to photopic light (first S/P ratio); a second LED component arranged to generate a second spectral output including a second ratio of scotopic to photopic light (second S/P ratio), wherein the first S/P ratio is at least 20% greater than the second S/P ratio; and at least one control circuit arranged to independently supply current to the first LED component and the second LED component; wherein the light emitting apparatus comprises at least one of the following features (i) and (ii); (i) the light emitting apparatus is adapted to increase relative spectral output in a wavelength range below 507 nm when the light emitting apparatus is operated at an aggregated emissive output of less than 50% of maximum aggregated emissive output of the light emitting apparatus, in comparison to relative spectral output in a wavelength range below 507 nm when the light emitting apparatus is operated at maximum aggregated emissive output; and (ii) the light emitting apparatus is adapted to increase correlated color temperature of aggregated emissions by at least about 200K when the light emitting apparatus is operated at an aggregated emissive output of less than 50% of maximum aggregated emissive output, relative to correlated color temperature of aggregated emissions at maximum aggregated emissive output. - View Dependent Claims (43, 44, 45, 46)
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Specification