Blue diffuser in white / white application to create a blue sky

The luminaire achieves nuanced color emission by combining light source groups with distinct intensity profiles and optical filtering, addressing the limitations of existing luminaires in color variation and cost.

DE102017119263B4Active Publication Date: 2025-08-21TRILUX GMBH & CO KG
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Patent Information

Application Number
DE102017119263
Authority / Receiving Office
DE · DE
Patent Type
Patents
Current Assignee / Owner
Filing Date
2017-08-23
Publication Date
2025-08-21
Estimated Expiration
2037-08-23

AI Technical Summary

Technical Problem

Existing luminaires struggle to emit light in user-desired colors like red, blue, or green with nuanced variations, as colored light sources have narrow spectral widths, leading to inharmonious color perception and require numerous costly light source groups for variation.

Method used

A luminaire with two light source groups, each emitting different intensity profiles, combined with an optical element having distinct transmittance properties in specific wavelength ranges, allows independent control and dimming to achieve pleasant and nuanced color tones.

Benefits of technology

The luminaire emits light with continuous color nuances by combining broadband light sources and optical filtering, providing pleasant color tones without the need for multiple light source groups, enhancing user-adjustable color variation.

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Abstract

A luminaire comprising two light source groups, each comprising at least one light source (1, 2), and an optical element (3), wherein the at least one light source (1) of the first light source group is designed to emit light with a first intensity profile (10) for radiating a first light color, which has a first mean intensity value averaged over a wavelength interval between 500 nm and 600 nm, and wherein the at least one light source (2) of the second light source group is designed to emit light with a second intensity profile (20) for radiating a second light color, which has a second mean intensity value averaged over the wavelength interval, wherein the first and the second intensity profiles differ, wherein the light sources (1, 2) of the light source groups are arranged on a light entry side of the optical element (3) and are thus arranged relative to the optical element (3),that the light emitted by them enters the optical element (3) at the light entry side of the optical element (3) before exiting at its light exit side, characterized in that the optical element (3) has a transmittance which is less than 60%, in particular between 5% and 60%, in a first wavelength range having a width of at least 50 nm, in particular of at least 80 nm, and which is more than 70%, in particular more than 80%, in a second wavelength range having a width of at least 30 nm, in particular at least 60 nm, and does not overlap with the first wavelength range, wherein a first intensity averaged over the first wavelength range and a second intensity averaged over the second wavelength range of the first intensity profile (10) each amount to at least 10%, in particular at least 15% of the first intensity mean value,and wherein a first intensity averaged over the first wavelength range and a second intensity averaged over the second wavelength range of the second intensity profile (20) are each at least 10%, in particular at least 15% of the second intensity mean value, wherein the at least one light source (1) of the first light source group is designed to emit a warm white light color with a color temperature of less than 3,500 K, and wherein the at least one light source (2) of the second light source group is designed to emit a cold white light color with a color temperature of more than 4,000 K.,
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