Time-Based Multi-CCT Lighting for Natural Light Replication
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Solution Overview
Problem
There is an increasing demand for technologies that can implement white light similar to natural light using light-emitting devices, which existing technologies have not adequately addressed in terms of replicating the dynamic spectral characteristics of natural light throughout the day.
Innovation Solution
A light emitting apparatus is developed, comprising at least one light emitting device, where the natural light similarity S is defined by Equation 1, and the apparatus includes a plurality of light emitting devices with different correlated color temperatures, along with a controller to adjust the light intensity ratio for various times of day, ensuring a high quality and reliable illumination similar to natural light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple light emitting devices with different correlated color temperatures are used to replicate natural light spectrum, then the natural light similarity is improved, but the device complexity increases
Solution Approach 1:
The patent divides the light emitting apparatus into multiple independent light emitting devices, each emitting light with a different correlated color temperature (e.g., 2000K, 4000K, 6000K). Each device functions as a separate module that can be individually controlled to replicate the spectral characteristics of natural light at different times of day, thereby improving natural light similarity while maintaining manageable device complexity through modular design.
Solution Approach 2:
The light emitting apparatus is designed to perform multiple functions by integrating several light emitting devices with different color temperatures into a single system. The controller enables the apparatus to simulate natural light conditions for various times of day (morning, noon, evening) by adjusting the intensity ratios of individual devices, making the system universally applicable for circadian rhythm regulation and natural light replication across different temporal contexts.
2Adaptability or versatility
If the light intensity ratio of multiple light emitting devices is dynamically adjusted for different times of day, then the adaptability to natural light conditions is improved, but the control system complexity increases
Solution Approach 1:
The control system is designed to dynamically adjust the intensity ratios of multiple light emitting devices based on the time of day. The controller receives time information and automatically modifies the output of each light emitting device to match the spectral characteristics of natural light at different times (e.g., warmer tones in the evening, cooler tones at noon), enabling the system to adapt to natural light conditions while automating the control process to minimize user burden.
Solution Approach 2:
The system incorporates time-based feedback mechanisms where the controller continuously monitors the time of day and adjusts the light emitting device intensities accordingly. This feedback loop ensures that the light output automatically aligns with natural light conditions without requiring manual intervention, balancing adaptability with automated control that reduces perceived system complexity for the user.
3Measurement precision
If the RMS of natural light similarity is minimized to achieve high quality illumination, then the illumination quality is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent focuses on optimizing the correlated color temperature parameters of the light emitting devices (e.g., selecting devices with specific CCT values like 2000K, 4000K, 6000K) to minimize the RMS of natural light similarity. By carefully selecting and tuning these spectral parameters, the system achieves high illumination quality that closely matches natural light characteristics without requiring extremely tight manufacturing tolerances on physical dimensions, thereby balancing illumination quality with manufacturability.
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 light emitting apparatus effectively replicates natural light by achieving a high natural light similarity S, with an RMS of the natural light similarity S being less than or equal to 0.8, and provides a vivid color gamut, ensuring reliable performance against external environments.
Implementation Method 1
each of the light emitting devices may include a light emitting diode configured to generate light
Implementation Method 2
a wavelength converter covering a light exit surface of the light emitting diode
Data Source
AI summary
A light emitting apparatus includes at least one light emitting device, wherein a natural light similarity S of light emitted from the light emitting apparatus ranges from −2.5 to 1.