HINS Non-HINS Lighting Control for Occupied Disinfection
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Solution Overview
Problem
Conventional HINS lighting systems face challenges in delivering the required intensity and duration of narrow spectrum light for effective disinfection in occupied environments, as the near-ultraviolet light can be visually uncomfortable for humans and may not provide sufficient visibility.
Innovation Solution
A lighting system that includes a high intensity narrow spectrum (HINS) LED array and a non-HINS LED array, controlled by an electronic processor and sensors to adjust the light intensity and duration based on the presence of people in the area, ensuring effective disinfection while maintaining visibility and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HINS light is used at high intensity for effective disinfection, then disinfection effectiveness is improved, but visual comfort and visibility deteriorate
Solution Approach 1:
The lighting system dynamically adjusts the intensity and spectral composition of light based on occupancy detection. When no occupants are present, the system delivers high-intensity HINS light (400-420nm) for effective disinfection. When occupants are detected, the system transitions to non-HINS lighting or reduces HINS intensity to eliminate visual discomfort while maintaining disinfection capability through extended duration or repeated cycles.
Solution Approach 2:
The system implements periodic disinfection cycles using HINS light in unoccupied periods, followed by transitions to comfortable lighting when occupancy is detected. This periodic alternation between high-intensity HINS disinfection mode and comfortable ambient lighting mode allows the system to achieve both effective disinfection and visual comfort throughout different operational periods.
2Duration of action of moving object
If HINS light intensity is increased for effective disinfection, then disinfection dose is improved, but visibility and comfort for occupied areas worsen
Solution Approach 1:
The system dynamically controls lighting parameters based on real-time occupancy status. In unoccupied areas, it delivers high-intensity HINS light at full power for optimized disinfection dose. Upon detecting occupancy, it dynamically reduces HINS intensity and supplements with non-HINS visible light sources to maintain adequate visibility and comfort while continuing the disinfection process at adjusted parameters.
Solution Approach 2:
The lighting system is segmented into multiple independent light sources with different spectral characteristics - HINS LEDs (400-420nm) for disinfection and non-HINS LEDs providing visible ambient light. This segmentation allows independent control of each segment's intensity and duration, enabling the system to deliver sufficient HINS disinfection dose while simultaneously maintaining visibility through non-HINS segments during occupied periods.
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 system effectively delivers a sufficient dose of HINS light for disinfection while reducing visual discomfort and improving visibility by adjusting light intensity and duration in response to occupancy, ensuring effective surface disinfection in variably occupied environments.
Implementation Method 1
light devices, such as light-emitting diodes (LEDs) configured to output light at wavelengths from approximately 400 nm to approximately 420 nm (for example, 405 nm)
Implementation Method 2
High Intensity Narrow Spectrum (HINS) lighting systems include light devices, such as light-emitting diodes (LEDs) configured to output light at wavelengths from approximately 400 nm to approximately 420 nm
Implementation Method 3
Light at such wavelengths has been shown to inactivate (that is, kill or damage) bacteria, including medically significant bacteria, such as Methicillin-resistant Staphylococcus aureus (MRSA)
Data Source
AI summary
Systems and methods for combined HINS and non-HINS lighting for surface disinfection. A lighting system controller is provided, which includes a memory, an i/o interface, and an electronic processor. The processor is configured to retrieve from the memory at least one characteristic of an area to be disinfected; determine, based on a signal received from a first sensor positioned to sense the presence of a person in the area, whether a person is present in the area; and, when a person is present in the area, determine a first drive signal based on the at least one characteristic and the presence of the person, and a second drive signal based on the presence of the person in the area and the first drive signal. The processor provides the first drive signal to drive to a HINS LED array and the second drive signal to drive a non-HINS LED array.