LED Lighting Arrangement with Selective Phosphor Conversion
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Solution Overview
Problem
Existing LED lighting systems require multiple light modules to achieve desired white light color temperatures, leading to inefficiencies in manufacturing and flexibility, as they need to be combined in specific ways to produce the desired output.
Innovation Solution
A lighting arrangement comprising three groups of LEDs with different color temperatures, where a third group with a predetermined dominant wavelength is connected via a light converting device with electrical means to adjust the overall color temperature by selectively connecting with either the first or second group, allowing for adaptive control without separate control of the third group.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple light modules with different white light characteristics are combined to achieve desired color temperature, then the desired white light output is achieved, but the device complexity and manufacturing requirements increase
Solution Approach 1:
The patent divides the lighting system into three separate groups of light sources: first group LEDs providing white light with first color temperature, second group LEDs providing white light with second color temperature, and third group LEDs providing light with predetermined dominant wavelength. Each group can be independently controlled and combined with the light converting device to achieve different color temperatures, reducing the need for multiple complete light modules
Solution Approach 2:
The third group of light sources with predetermined dominant wavelength serves multiple functions: it can be combined with the first group to produce warmer white light, combined with the second group to produce cooler white light, or used independently with the light converting device. This multi-functional design reduces the total number of specialized light modules needed
2Adaptability or versatility
If different phosphor materials and coatings are used to vary white light characteristics, then color temperature control is improved, but the manufacturing precision requirements increase
Solution Approach 1:
Instead of relying solely on precise control of phosphor coating thickness and material composition, the patent changes the fundamental parameter approach by using three distinct groups of LEDs with different color temperatures. The desired color temperature is achieved by selecting which groups to activate and how to combine them with the light converting device, rather than precisely manufacturing phosphor layers to exact specifications
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
Enables flexible adjustment of white light color temperature without needing separate control of the third group, allowing for more freedom in selecting LEDs and varying phosphor characteristics to achieve desired outputs, reducing the need for multiple light modules.
Implementation Method 1
a light converting device comprising a phosphor, the light converting device configured for converting light from the third group of light sources to white light having a third colour temperature
Data Source
AI summary
A lighting arrangement (100), comprising a first group of light sources (102) comprising at least one LED providing white light having a first color temperature; a second group of light sources (110) comprising at least one LED providing white light having a second color temperature; and a third group of light sources (116) comprising at least one LED providing a light having a predetermined dominant wavelength; wherein the third group of light sources (116) is configured to receive a light converting device (200, 400) comprising a phosphor (208, 208′, 208″, 208′″, 414), the light converting device (200, 400) configured for converting light from the third group of light sources (116) to white light having a third color temperature, wherein the light converting device (200, 400) is configured to have electrical connection means (120) for providing an electrical connection between one of the first (102) and the second (110) group of light sources and the third group of light sources (116).