Tunable White Lighting Profiles for Circadian CCT and Brightness Control
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Solution Overview
Problem
Existing tunable white light fixtures face challenges in achieving desired brightness and color temperature control, particularly in circadian lighting systems, which require complex and time-consuming programming to mimic sunlight properties throughout the day.
Innovation Solution
A system and method for controlling tunable white light fixtures that include a device with multiple power outputs, allowing for the creation of profiles to mix warm and cool channels to achieve desired brightness and color temperature, with options for static or dynamic scenes that mimic sunlight properties, and user-adjustable settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If tunable white light fixtures are used to achieve desired brightness and color temperature control, then lighting quality and functionality are improved, but system complexity and programming requirements increase
Solution Approach 1:
The system performs preliminary measurements of the warm and cool LED channels during manufacturing to create a profile that stores the relationship between dimmer levels and color temperature. This pre-characterization eliminates the need for complex runtime measurements and simplifies the control system, as the profile data is readily available when needed for operation.
Solution Approach 2:
The patent creates a digital profile that copies and stores the characteristic behavior of the LED channels across different power levels. This profile serves as a lookup table that maps desired color temperatures to specific dimmer settings, replacing complex real-time control algorithms with simple data retrieval and application.
2Reliability
If complex programming is implemented to mimic sunlight properties throughout the day, then circadian lighting effectiveness is improved, but ease of operation deteriorates
Solution Approach 1:
The system automatically performs the complex task of calculating appropriate dimmer settings by querying the pre-stored profile with desired color temperature values. This self-service approach eliminates the need for users to manually program or calculate the complex relationships between time of day, sunlight properties, and LED channel mixing ratios.
Solution Approach 2:
The patent transforms the complex multi-parameter control problem into a simplified lookup operation where the system only needs to retrieve pre-calculated dimmer settings from the profile based on the desired color temperature. This parameter transformation converts a complex control task into a simple data retrieval operation.
3Measurement precision
If separate control of warm and cool LED channels is implemented, then color temperature precision is improved, but device complexity increases
Solution Approach 1:
The system performs preliminary measurements of the warm and cool LED channels during manufacturing to create a profile that stores the relationship between dimmer levels and color temperature. This pre-characterization eliminates the need for complex runtime measurements and simplifies the control system, as the profile data is readily available when needed for operation.
Solution Approach 2:
The patent creates a digital profile that copies and stores the characteristic behavior of the LED channels across different power levels. This profile serves as a lookup table that maps desired color temperatures to specific dimmer settings, replacing complex real-time control algorithms with simple data retrieval and application.
Data Source
AI summary
A system for controlling human centric tunable white lights. A tunable white light fixture and a device comprising a plurality of power outputs. A profile of a plurality of power settings to mix an output of a warm channel and an output of a cool channel of the tunable white light fixture to produce light of a desired brightness and a desired CCT. Information for a scene comprising static brightness and static CCT levels and information for an automatic progression of varying brightness and CCT levels designed to mimic a plurality of properties of the sun's light at predetermined times.