LED Filament Lamp Candlelight Color Gradient
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Solution Overview
Problem
LED lighting lacks the aesthetic appeal and warmth of candlelight while candles pose a fire hazard, necessitating a solution that combines the advantages of LED lighting with the attractive properties of candlelight in a safe and efficient manner.
Innovation Solution
A LED filament lamp with a varying density of blue and red LEDs along its length, mimicking the color temperature transition from blue to red, is designed to resemble candlelight, featuring a luminescent encapsulant and a control unit for power management, ensuring a warm and romantic light output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If candles are used to provide warm, aesthetic light, then the light appearance is attractive and romantic, but the fire risk increases
Solution Approach 1:
The patent creates a visual copy of candlelight using LEDs arranged to emit light with varying color temperatures along the filament length. The encapsulant material is designed to transmit and modify this light, reproducing the warm, flickering appearance of candlelight without the actual flame, thereby eliminating fire risk while maintaining aesthetic appeal
Solution Approach 2:
The patent varies the color temperature parameter of the light source along the length of the filament, transitioning from cooler to warmer tones to mimic the natural color distribution of candlelight. This parameter change enables the LED filament to reproduce the characteristic appearance of candlelight safely
2Duration of action of stationary object
If LEDs are used to provide long operational life and low power consumption, then energy efficiency is improved, but the light appearance becomes static and cold
Solution Approach 1:
The patent introduces dynamic characteristics to the LED filament by varying the color temperature along the filament length and incorporating elements that create flickering effects. This transforms the static LED output into a dynamic light source that mimics the living, flickering nature of candlelight, thereby improving aesthetic appeal while maintaining LED longevity
Solution Approach 2:
The patent applies different color temperatures and emission characteristics to different sections of the filament. The local variation in LED density and encapsulant properties creates zones with different thermal and optical characteristics, reproducing the natural color gradients of candlelight while preserving the energy efficiency of LEDs
3Illumination intensity
If candles are used to provide warm light, then aesthetic appeal is improved, but the device complexity and components increase
Solution Approach 1:
The patent merges multiple functions into a single integrated LED filament structure. The encapsulant material simultaneously serves as a protective barrier, a light transmitter, and a color temperature modifier. This integration reduces the number of separate components needed compared to traditional candle alternatives, simplifying the device while maintaining aesthetic appeal
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 LED filament lamp generates a warm, aesthetically appealing light similar to candlelight while being safer and more cost-efficient, with a longer operational life and easier recycling due to fewer components.
Implementation Method 1
the encapsulant comprises a luminescent material
Implementation Method 2
The linear array of LEDs comprises a plurality N of blue LEDs emitting blue light and a plurality of M red LEDs emitting red light
Data Source
AI summary
A light emitting diode, LED, filament lamp (100), comprising at least one LED filament (120, 120a, 120b) having abase portion (210) and a top portion (22) extending over a length, L, along a longitudinal axis, A, wherein the LED filament comprises an array of a plurality of light emitting diodes, LEDs, (140) extending along the longitudinal axis A. An encapsulant (145) at least partially enclosing the plurality of LEDs, wherein the encapsulant comprises a luminescent material (150). The linear array of LEDs (140) comprising a plurality N of blue LEDs (106) emitting blue light and a plurality of M red LEDs (107) emitting red light, the linear array of LEDs (140) comprising a density of blue LEDs and a density of red LEDs, The density of blue LEDs decreases and/or the density of red LEDs increases from the base portion (210) to the top portion (220) along at least a portion of the length (L), whereby the color temperature, CTL, of the light emitted from the at least one LED filament decreases from the base portion (210) to the top portion (220) over at least a portion of the length of the at least one LED filament.