LED Lamp Wavelength Shift for Safe Bactericidal Action
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Solution Overview
Problem
Existing antibacterial lighting devices emit hazardous ultraviolet wavelengths, are not adaptable to standard installations, lack control mechanisms for exposure times, and can lead to over-sterilization, posing health risks and being costly.
Innovation Solution
A LED lamp with standard caps, using a combination of red, green, blue-violet, and white LEDs emitting within safe visible spectra, equipped with a microcontroller and Peltier cells for temperature stabilization and dynamic control, ensuring constant spectral emission and adjustable operation times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ultraviolet wavelengths (100-400nm) are used for bactericidal action, then microbial reduction effectiveness is improved, but health hazards (skin cancer, acne, skin irritation) increase
Solution Approach 1:
The patent changes the wavelength parameter from the harmful ultraviolet range (100-400nm) to the safe visible blue-violet range (405-420nm). This parameter change maintains the bactericidal effectiveness while eliminating the health hazards associated with UV radiation, as the visible spectrum does not cause skin cancer or Mallorca acne.
Solution Approach 2:
The patent converts the potentially harmful ultraviolet wavelengths into beneficial visible blue-violet light wavelengths (405-420nm). By using LEDs that emit in this specific visible range, the harmful UV radiation is replaced with a safer alternative that still provides the desired bactericidal effect, turning a harmful approach into a beneficial one.
2Reliability
If specialized antibacterial lighting devices are used, then microbial reduction is improved, but adaptability to existing installations deteriorates
Solution Approach 1:
The patent creates a universal lighting device that can be installed in existing fixtures by using standard E27 or E14 screw caps. The lamp serves multiple functions: it provides general illumination through white LEDs and simultaneously delivers bactericidal action through blue-violet LEDs (405-420nm), making it adaptable to existing installations while maintaining microbial reduction effectiveness.
Solution Approach 2:
The patent segments the lighting function into separate LED modules: white LEDs for illumination and blue-violet LEDs (405-420nm) for bactericidal action. This segmentation allows the device to perform multiple functions within a single lamp structure that fits standard sockets, enabling easy integration into existing installations.
3Reliability
If continuous bactericidal light emission is used, then microbial reduction is improved, but risk of over-sterilization and immune system damage increases
Solution Approach 1:
The patent implements periodic action through a microcontroller that controls the timing and duration of blue-violet LED activation. The system can operate in different modes: continuous emission for high-risk environments or periodic/pulsed emission for home environments. This periodic control prevents over-sterilization and allows natural microorganisms needed for immune system development to remain present.
Solution Approach 2:
The patent introduces dynamic control through a microcontroller that adjusts the operation parameters of the blue-violet LEDs based on environmental conditions and usage requirements. The system can dynamically switch between different emission patterns (continuous, periodic, pulsed) and durations, allowing optimization of microbial reduction while preventing harmful over-sterilization effects.
4Device complexity
If blue-violet LEDs operate without temperature control, then device simplicity is improved, but wavelength stability deteriorates due to thermal shifts
Solution Approach 1:
The patent implements feedback control through a temperature sensor that continuously monitors the LED operating temperature and a microcontroller that adjusts the drive current accordingly. When the temperature rises and causes wavelength drift toward the UV region, the system reduces the current to stabilize the wavelength. This feedback mechanism ensures wavelength stability while maintaining relatively simple device architecture.
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 provides effective antibacterial action without hazardous ultraviolet emission, adaptability to existing lighting systems, and controlled microbial reduction, ensuring safety and efficiency in various environments.
Implementation Method 1
The structure is equipped with a source of controlled and regulated bactericidal light based on the combination of Light Emitting Diodes (LED) and photocatalytic material, with a microcontroller which, by monitoring the operating temperature, is able to adjust the temperature of the lighting chamber through a thermal conditioning system based on two Peltier cells
Implementation Method 2
a first group of LEDs (106) is composed by a red LED (109) capable of emitting a visible electromagnetic radiation with a wavelength in the range between 633 and 660 nm, a green LED (110) capable of emitting a visible electromagnetic radiation with a wavelength in the range between 555 and 570 nm, a blue-violet color LED (111) capable of emitting a visible electromagnetic radiation with a wavelength lying in the range between 405 and 410 nm
Implementation Method 3
On the entire surface of the diffuser (103) there is a photocatalytic material based on titanium dioxide (Ti02), or tungsten trioxide (W03), or other similar material which exerts any similar action that is 'biocidal and/or virucidal and/or of control of allergens'
Data Source
AI summary
Purpose of the present invention is the realization of a LED illuminating device, more specifically a LED lamp structure with standard caps (Edison, bayonet.. ) and therefore ready to install on any existing lighting system, able to break down, thank you to its own technical and constructive characteristics, the microbial load present in the environments in which the luminaire is installed. The device also allows a power consumption not different from the one of a standard LED bulb/lamp, does not employ photocatalytic materials classified as hazardous, does not emit wavelengths that fall in the ultraviolet region but only in the band 405-420 nm, and can be supplied with a thermostated lighting room and an articulated endowment of sensors and management technologies.