LED Lamp High CRI Segmented Array Design
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Solution Overview
Problem
LED lighting systems face challenges in achieving high color rendering index (CRI) and omnidirectional luminous intensity distribution due to obstructions from electronic circuitry and heat sinks, which affect their ability to replace traditional incandescent bulbs effectively.
Innovation Solution
The development of an LED lamp with a color mixing treatment and a conical reflective surface, along with a thermal post or heat pipe, that allows light to pass through without remote wavelength conversion, ensuring a CRI of at least 90 and maintaining luminous intensity distribution uniformity across angles, similar to incandescent bulbs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If LED bulbs include electronic circuitry and heat sink, then energy efficiency and durability are improved, but light distribution uniformity deteriorates due to obstructions
Solution Approach 1:
The LED bulb is divided into multiple segments: LED assemblies arranged in a circular array, each emitting light in specific directions. The segmentation allows light to be emitted from multiple points around the bulb, compensating for obstructions and achieving more uniform omnidirectional distribution.
Solution Approach 2:
The patent transitions from linear or planar LED arrangements to a three-dimensional circular array configuration. LEDs are positioned at different heights and angular positions around the bulb axis, creating omnidirectional light emission in multiple spatial dimensions to overcome obstructions from circuitry and heat sinks.
2Reliability
If LED bulbs include electronic circuitry and heat sink, then operational reliability is improved, but angular uniformity of light emission deteriorates
Solution Approach 1:
The bulb is segmented into multiple LED assemblies positioned at different angular positions around the central axis. This segmentation allows each assembly to contribute to light emission in its specific direction, collectively achieving uniform angular distribution despite the presence of obstructing components.
Solution Approach 2:
The patent employs asymmetric positioning of LED assemblies at specific angular intervals around the bulb axis, with each assembly oriented to emit light in its optimal direction. This asymmetric arrangement compensates for the asymmetric obstructions caused by circuitry and heat sinks, achieving symmetric uniform light distribution.
3Device complexity
If remote wavelength conversion materials are used, then color rendering is simplified, but CRI accuracy deteriorates
Solution Approach 1:
The patent extracts and eliminates the remote wavelength conversion phosphor dome from the bulb structure. Instead, individual LED assemblies with their own integrated wavelength conversion materials are used, allowing precise control of spectral output and achieving high CRI accuracy of at least 90.
Solution Approach 2:
Different LED assemblies use different wavelength conversion materials with specific characteristics tailored to their emission requirements. This local optimization of spectral properties allows each assembly to contribute optimally to the overall color rendering, achieving high CRI accuracy through customized local quality rather than a single remote phosphor.
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 enables an LED lamp with a high CRI and uniform luminous intensity distribution, meeting standards for replacing incandescent bulbs, such as the L Prize requirements, by optimizing light emission and distribution without the need for remote wavelength conversion materials.
Implementation Method 1
a conical reflective surface, disposed within the enclosure between the LED assembly and the power supply
Implementation Method 2
a thermal post or heat pipe that allows light to pass through
Data Source
AI summary
An LED lamp with a high color rendering index (CRI) is disclosed. Example embodiments of the invention provide an LED lamp with a relatively high color rendering index (CRI). In some embodiments, the lamp has other advantageous characteristics, such as good angular uniformity. In some embodiments, the LED lamp is sized and shaped as a replacement for a standard incandescent bulb, and includes an LED assembly with at least first and second LEDs operable to emit light of two different colors. In some embodiments, the lamp can emit light with a color rendering index (CRI) of at least 90 without remote wavelength conversion. In some embodiments, the LED lamp conforms some, most, or all of the product requirements for a 60-watt incandescent replacement for the L prize.