Direct Red LED White Light Tuning for PIF3 and P2F3 Compliance
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Solution Overview
Problem
Existing lighting devices and systems struggle to meet desirable lighting quality standards such as PIF3 and P2F3 requirements with high energy efficiency, and there is a need to tune the spectral power distribution of generated light.
Innovation Solution
A light generating system comprising primary and secondary solid state light sources, along with first and second luminescent material arrangements, configured to generate light with varying spectral power distributions and correlated color temperatures, controlled by a control system to achieve desired lighting qualities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional single off-white LED source is used, then device complexity is low, but lighting quality standards (PIF3, P2F3) cannot be met
Solution Approach 1:
The patent combines multiple LED light sources (first off-white LED, second off-white LED, and red LED) into a single integrated light generating system. These diverse light sources are optically coupled to work together, merging their spectral outputs to achieve comprehensive coverage of the visible spectrum and meet stringent lighting quality standards like PIF3 and P2F3 that cannot be achieved by a single off-white LED source.
Solution Approach 2:
The light generating system is designed with multi-functionality to serve multiple purposes: it provides general illumination while simultaneously meeting specific lighting quality metrics (PIF3, P2F3), enables circadian rhythm regulation through melanopic control, and offers tunable correlated color temperature. This universal design allows the same system structure to achieve diverse lighting objectives.
2Reliability
If multiple light sources and luminescent materials are used to meet PIF3 and P2F3 requirements, then lighting quality improves, but energy efficiency decreases
Solution Approach 1:
The patent utilizes luminescent materials with specific photoluminescent properties to convert light from LED sources into desired spectral components. By carefully selecting luminescent materials with appropriate emission wavelengths and efficiencies, the system transforms electrical energy through optimized optical conversion processes, maintaining high overall energy efficiency while achieving the required spectral power distribution for PIF3 and P2F3 compliance.
3Adaptability or versatility
If fixed spectral power distribution is used, then device complexity is low, but adaptability to different lighting conditions is poor
Solution Approach 1:
The light generating system incorporates independent control of multiple LED light sources, enabling dynamic adjustment of the spectral power distribution. By individually controlling the intensity of each LED source (first off-white LED, second off-white LED, red LED), the system can dynamically tune the correlated color temperature and spectral characteristics to match different ambient lighting conditions and application requirements, transforming a static system into an adaptive one.
4Ease of manufacture
If conventional lighting systems are used, then manufacturing is simple, but circadian rhythm stimulation capability is insufficient
Solution Approach 1:
The patent incorporates a red LED light source that emits in the 610-630nm wavelength range, which corresponds to the spectral region most effective for stimulating melanopsin and regulating circadian rhythm. By integrating this specific color component into the overall lighting system, the patent enhances circadian rhythm support capability while maintaining a relatively straightforward manufacturing approach that builds upon conventional LED lighting architecture.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system efficiently meets PIF3 and P2F3 requirements over a wide range of correlated color temperatures, including low regions, and allows control of melanopic equivalent daylight illuminance for circadian rhythm stimulation.
Implementation Method 1
the first luminescent material arrangement is configured to convert at least part of the primary light of the at least one primary solid state light source into first luminescent material arrangement light
Implementation Method 2
an optical component that is positioned to receive at least a portion of the off-white light generated by the one or more light sources, the optical component comprising an optical material for converting at least a portion of the off-white light to one or more predetermined wavelengths
Data Source
AI summary
The invention provides a light generating system (1000) comprising one or more primary solid state light sources (50), one or more secondary solid state light sources (60), a first luminescent material arrangement (1210), a second luminescent material arrangement (1220), and a control system (300), wherein: (A) the one or more primary solid state light sources (50) are configured to generate primary light (51); (B) the one or more secondary solid state light sources (60) are configured to generate secondary light (61); (C) the first luminescent material arrangement (1210) is configured in a light receiving relationship with at least one primary solid state light source (50) and is configured to convert at least part of the primary light (51) of the at least one primary solid state light source (50)) into first luminescent material arrangement light (1211); wherein when the at least one primary solid state light source (50) alone irradiates the first luminescent material arrangement (1210) a first spectral power distribution, comprising the primary light (51) (of the at least one primary solid state light source (50)) and the first luminescent material arrangement light (1211), is obtained; (D) the second luminescent material arrangement (1220) is configured in a light receiving relationship with at least one (other) primary solid state light source (50) and is configured to convert at least part of the primary light (51) into second luminescent material arrangement light (1221); wherein when the at least one (other) primary solid state light source (50) alone irradiates the second luminescent material arrangement (1220) a second spectral power distribution, comprising the primary light (51) and the second luminescent material arrangement light (1221), is obtained; (E) the first spectral power distribution and the second spectral power distribution have v′ values differing at least 0.02; wherein the first spectral power distribution has a first color point outside 10 standard deviation of color matching (SDCM) from the black body locus, and wherein the second spectral power distribution has a second color point outside 10 standard deviation of color matching (SDCM) from the black body locus.