Lamps with Multi-Phosphor Spectral Tuning for Color Rendering
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Solution Overview
Problem
Conventional light sources, particularly fluorescent lighting, often exhibit poor color rendering and unappealing color temperatures, especially at high correlated color temperatures, which can lead to muted colors and an overemphasis on yellow light, making them unsuitable for applications requiring accurate color representation.
Innovation Solution
Development of lamps with improved color quality scales, utilizing non-incandescent light-emitting elements such as phosphor, vapor discharge, or high-intensity discharge lamps, which generate light with specific delta chroma values within defined parameters in the CIE LAB space, ensuring enhanced color contrast and accurate color representation across various correlated color temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If fluorescent lighting is used to provide energy-efficient illumination, then energy efficiency is improved, but color rendering quality deteriorates
Solution Approach 1:
The patent applies parameter changes by carefully selecting and combining multiple phosphors with specific emission characteristics (peak wavelengths, half-widths, and relative intensities) to transform the spectral output of the fluorescent lamp. This enables the lamp to achieve both high energy efficiency and superior color rendering by adjusting the phosphor composition parameters to match desired spectral targets.
Solution Approach 2:
The patent employs composite materials by using a multi-phosphor system where different phosphors (including red, green, blue, and yellow phosphors) are combined in specific ratios. This composite phosphor layer converts the ultraviolet and blue-violet light from the mercury vapor discharge into a balanced spectrum that renders colors accurately while maintaining fluorescent energy efficiency.
2Temperature
If high color temperature light sources are used to provide cool white light, then apparent color temperature is improved, but color rendering quality deteriorates
Solution Approach 1:
The patent uses parameter changes to decouple color temperature from color rendering quality. By adjusting the phosphor composition parameters (particularly adding red phosphor with specific half-width and intensity ratios), the invention achieves high color temperatures (4000-8000K) while maintaining excellent color rendering, overcoming the traditional trade-off where high color temperature sources produce poor color rendering.
Solution Approach 2:
The patent applies local quality by enhancing specific regions of the spectrum through targeted phosphor selection. The red phosphor component is specifically optimized to provide strong red emission (600-680nm peak) that compensates for the natural deficiency in high color temperature sources, creating localized spectral enhancement that improves overall color rendering without reducing color temperature.
3Use of energy by moving object
If conventional fluorescent lamps are used to provide illumination, then energy efficiency is improved, but color contrast is reduced
Solution Approach 1:
The patent applies parameter changes by optimizing the spectral distribution parameters of the phosphor combination. Specifically, the red phosphor is designed with a half-width of 50-100nm and peak intensity ratio of 0.3-0.8 relative to blue phosphor, creating enhanced red emission that improves color contrast. This spectral parameter optimization maintains fluorescent energy efficiency while delivering superior color contrast comparable to filtered incandescent sources.
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 lamps provide enhanced color contrast and accurate color representation, comparable to filtered incandescent bulbs like REVEAL™, but without the use of incandescent elements, making them suitable for applications requiring true color perception, such as commercial units and photography studios.
Implementation Method 1
The lamp comprises at least one light-emitting element having a light emission when energized... phosphor... which generate light with a total light emission having delta chroma values
Implementation Method 2
vapor discharge... light-emitting elements... when energized it generates light
Implementation Method 3
high-intensity discharge lamps, which generate light with a total light emission having delta chroma values
Data Source
AI summary
A lamp having improved color quality scale, especially at elevated color temperatures, is provided. The light generated by the light-emitting elements of the lamp, when the lamp is energized, has delta chroma values for fifteen color samples of the color quality scale within select parameters. The delta chroma values are measured in the CIE LAB color space.