Multi-Spectral Lighting Device with Reflective Feedback Control
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Solution Overview
Problem
Conventional lighting devices that aim for high color rendering values consume more energy, making them inefficient for applications where a minimum color rendering is desired, such as illuminating objects like food in supermarkets or artwork in museums.
Innovation Solution
A lighting device with multiple spectrally narrow-band LEDs that can be individually controlled, equipped with a camera or gray-scale sensors to detect the reflection properties of objects, adjusts light output based on these properties and a set minimum color rendering value, optimizing energy usage by only using the necessary light sources for the required color rendering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional lighting devices use high color rendering values to illuminate objects, then the color representation is improved, but the energy consumption increases
Solution Approach 1:
The lighting device divides the illumination task into multiple spectral segments using separate LEDs for different wavelength ranges (blue 420-490nm, green 490-575nm, orange 585-650nm, red 650-750nm). The control unit selectively activates only the segments necessary to achieve the minimum required color rendering value, avoiding unnecessary energy consumption from activating all light sources at full intensity.
Solution Approach 2:
The system dynamically adjusts the intensity and activation state of each light source based on real-time feedback from the camera about the object's reflective properties. The control unit continuously optimizes the combination and intensity of different colored LEDs to maintain the minimum color rendering value while minimizing total energy consumption, rather than using fixed high-intensity illumination.
2Adaptability or versatility
If multiple spectrally narrowband light sources are used to achieve desired color points, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The camera serves multiple functions: it acts as both the illumination detection device for measuring reflective properties and as the recording device for capturing the object's appearance under different lighting conditions. This multi-functionality reduces the need for separate specialized components, thereby reducing overall device complexity despite using multiple spectrally narrowband LEDs.
Solution Approach 2:
The system implements a feedback loop where the camera continuously measures the object's reflective properties under the current lighting conditions, and the control unit uses this information to automatically adjust the intensity and activation of each LED. This closed-loop control enables the system to achieve precise color rendering with minimal manual intervention, reducing operational complexity.
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 solution allows for energy-efficient illumination by dynamically controlling the light sources to achieve a desired minimum color rendering value, reducing energy consumption while maintaining optimal color representation, with the potential for significant energy savings as the color rendering value is set lower.
Implementation Method 1
The means for detecting the reflection properties preferably comprise a camera, in particular a greyscale camera, or several greyscale sensors coupled together
Data Source
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AI summary
Method and lighting device (1) for illuminating an object, wherein the object is illuminated with several light sources (2) which each emit light in a specific color or a specific wavelength range, wherein means (3) arranged in the lighting device (1) detect the reflection properties of the object and the light emission of the light sources (2) is controlled by a control unit (4) depending on the reflection properties and a minimum color rendering value adjustable on operating means (5).