LED Lamp Cylindrical Optical Element Spacing
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Solution Overview
Problem
Current LED lighting systems face challenges in achieving high efficiency, high output, and optimal color reproduction, particularly in meeting standards like the L Prize requirements for solid-state lamps, which demand high lumens per watt, color rendering index, and specific correlated color temperature.
Innovation Solution
The development of an LED lamp with a cylindrical or frustoconical optical element that receives light from an LED assembly, featuring a primary exit surface spaced at least 1.5 inches away to enhance light distribution and efficiency, combined with a power supply and specific LED configurations to produce warm white light with a high color rendering index and correlated color temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the optical element is positioned close to the LED assembly, then the device complexity is reduced, but the light distribution efficiency and color rendering deteriorate
Solution Approach 1:
The patent positions the optical element at a distance of at least 1.5 inches from the LED assembly along the optical axis, creating spatial separation in the longitudinal dimension. This dimensional arrangement allows the optical element to receive light from a larger solid angle and distribute it more effectively, improving light distribution efficiency without requiring complex internal optical structures.
2Productivity
If the optical element is positioned at least 1.5 inches from the LED assembly, then the light distribution efficiency improves, but the device complexity increases
Solution Approach 1:
The optical element serves multiple functions simultaneously: it distributes light uniformly, enhances color rendering by receiving light from a larger solid angle, and defines the beam angle. This multi-functionality is achieved through the simple spatial arrangement of positioning the optical element at least 1.5 inches from the LED assembly, avoiding the need for additional complex optical components.
3Illumination intensity
If multiple LED dies are used to increase light output, then the luminous flux increases, but the color rendering index deteriorates
Solution Approach 1:
The patent employs LED dies with different color temperatures (e.g., 6504K and 2856K) to illuminate different portions of the optical element or to provide complementary spectral content. This local quality differentiation allows the system to achieve both high luminous flux and high color rendering index by combining the advantages of different LED types.
4Productivity
If the optical element has a large surface area to distribute light, then the light distribution improves, but the correlated color temperature control becomes difficult
Solution Approach 1:
The patent controls the correlated color temperature by adjusting parameters such as the ratio of different LED dies, their spatial arrangement, and the distance between the LED assembly and optical element. By changing these parameters, the system achieves both good light distribution through the large optical element surface area and precise correlated color temperature control within the specified range of 2500-3500K.
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 achieves a light output of at least 1200 lumens with an efficiency of 150 lumens per watt and a color rendering index of 90, meeting L Prize criteria by optimizing light distribution and color temperature within the specified range.
Implementation Method 1
Light emitting diode (LED) lighting systems are becoming more prevalent as replacements for existing lighting systems
Implementation Method 2
Such optical elements may allow for localized mixing of colors, collimate light, and/or provide a controlled beam angle
Implementation Method 3
a large percentage of light from the LED assembly strikes curved walls of the optical element at an oblique angle and exits the fixture through the primary exit surface
Data Source
AI summary
A high-efficiency LED lamp is disclosed. Embodiments of the present invention provide a high-efficiency, high output solid-state lamp. The lamp includes an LED assembly, and an optical element or diffuser disposed to receive light from the LED assembly. The optical element includes a primary exit surface for the light, wherein the primary exit surface is at least about 1.5 inches from the LED assembly. In example embodiments, the optical element is roughly cylindrical in shape. An LED lamp according to some embodiments of the invention has an efficiency of at least 150 lumens per watt. In some embodiments, the lamp has a light output of at least 1200 lumens. In some embodiments, the LED lamp produces light with a color rendering index (CRI) of at least 90 and a correlated color temperature of from 2800 to 3000 K.