Beam-Shaping Lighting for Circadian Melanopic Lux Control
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Solution Overview
Problem
Existing lighting systems fail to effectively control visible-light emissions for improving circadian rhythms by combining factors such as color points, melanopic lux, beam widths, beam directions, light intensities, and circadian luminance.
Innovation Solution
A lighting system comprising a visible-light source, optical system, and control system that allows for selectable color points, beam widths, and directions, promoting high or low melanopic lux based on daytime or nighttime configurations, with integrated semiconductor light-emitting devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If lighting systems use fixed color temperature emissions, then manufacturing is simple, but adaptability to different circadian needs is poor
Solution Approach 1:
The lighting system dynamically adjusts color temperature between cool white (6504K) and warm white (2700K) based on time of day, allowing the system to adapt to circadian rhythms without requiring multiple fixed lighting systems. The control system switches between pre-configured LED combinations to provide appropriate spectral content at different times.
Solution Approach 2:
A single lighting system performs multiple functions by combining different LED types (cool white, warm white, and amber LEDs) that can be activated in different configurations. This universal system replaces what would traditionally require separate lighting systems for different circadian needs, reducing overall system complexity while maintaining adaptability.
2Area of stationary object
If lighting systems provide broad beam coverage, then illumination area is increased, but circadian effectiveness is reduced
Solution Approach 1:
The system uses different beam widths for different LED types based on their circadian function. Cool white LEDs use narrow beam widths (10-30 degrees) to concentrate melanopic stimulation on the retina, while warm white and amber LEDs use wider beam widths (60-120 degrees) for general illumination. This local optimization of beam quality ensures both circadian effectiveness and adequate coverage.
Solution Approach 2:
The lighting system segments the beam distribution into different angular zones. The control system can independently adjust the beam width of different LED groups, allowing narrow beams for circadian-effective cool white light and wider beams for ambient warm light, thereby achieving both concentrated circadian stimulation and broad illumination area.
3Reliability
If lighting systems use high melanopic lux during daytime, then circadian stimulation is improved, but energy consumption increases
Solution Approach 1:
The system changes the spectral parameters by switching between different LED combinations throughout the day. During daytime hours, it activates cool white LEDs with narrow beams to maximize melanopic lux. During nighttime, it switches to warm white and amber LEDs with wider beams for lower-energy ambient illumination, thereby reducing energy consumption while maintaining circadian effectiveness when needed.
Solution Approach 2:
The lighting system implements periodic action by following a daily circadian rhythm pattern. High melanopic lux output is provided during daytime hours when circadian stimulation is most beneficial, and reduced output with warmer colors is provided during nighttime. This periodic modulation of light output aligns with natural circadian cycles and reduces overall energy consumption compared to continuous high-output operation.
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 effectively enhances circadian rhythm regulation through controlled visible-light emissions, achieving desired color points, beam widths, and directions for improved user comfort and health benefits.
Implementation Method 1
The visible-light source includes a plurality of semiconductor light-emitting devices... arranged for generating a plurality of visible-light emissions having a range of selectable color points including a cool to very cool white color point for daytime and a warm to very warm white color point for nighttime
Implementation Method 2
The optical system is integrated with the visible-light source... arranged for causing some of the visible-light emissions to have a range of selectable beam widths including a relatively wide beam width and a relatively narrow beam width
Data Source
AI summary
Lighting system having visible-light source including semiconductor light-emitting devices arranged for generating plurality of visible-light emissions having range of color points including cool to very cool white color point for daytime and warm to very warm white color point for nighttime. Optical system arranged for causing some visible-light emissions to have range of beam widths including relatively wide and narrow beam widths. Mounting system causing range of beam directions. Control system causing visible-light emissions to include daytime configuration having cool to very cool white color point and relatively wide beam width, and nighttime configuration having warm to very warm white color point and relatively narrow beam width. Daytime configuration includes control system for causing visible-light emissions to include lateral- or up-light emissions, promoting relatively high equivalent melanopic lux. Nighttime configuration includes control system for causing visible-light emissions to include down-light emissions promoting relatively low equivalent melanopic lux.