A DANISH specialist in healthcare and human-centric lighting has claimed a breakthrough after it successfully killed 99.99 per cent of bacteria in 10 minutes using a light fitted with UV-C LEDs.
Lightcare says the experiment is a proof of the concept that luminaires fitted with UV-C can play a role in disinfecting spaces and help control the coronavirus in buildings in the coming years.
The company now plans to develop a combined passive-disinfecting and human-centric lighting system that will operate when rooms are unoccupied.
‘I think this is a breakthrough for greater use of human health centric controlled circadian lighting both for hospitals and other public places,’ Lightcare CEO Claus Søgaard told Lux.
As UV-C can be harmful to humans, the unit is designed to be operated by the cleaning staff or automatically pre-programmed to illuminate when no people are in the room.
The system will be locked or password-protected to ensure that the UV-C source is not accidentally turned on while there are people in the room.
The company suggests that integrated door-switches, passive infrared sensors or safety interlocks could allow the UV-C sources in the luminaire to be energised when spaces are unoccupied.
If people force access or randomly enter the room while the UV-C light is on, the door and safety switch or PIR motion sensor will automatically switch off the UV-C light and it will start again after a pre-programmed timer.
The UV-C light could be used as part of the regular cleaning cycle and is designed to prevent and reduce the spread of infectious diseases, bacteria, inactivate viruses and other types of harmful organic microorganisms in the environment by breaking down their DNA structure, or RNA structure in the case of the coronavirus.
The company recommends a minimum UV-C exposure time of a minimum of 20 minutes. The ultraviolet unit has a standard wavelength of 275 nanometers with 210 nanometres available on request.
After the fully automatically UV-C program is complete, the Lightcare OS control system will give a signal to the ventilation system which will run for a pre-programmed time.
The company says its procedures and designs are informed by, and compliant with, the Illuminating Engineering Society’s recent report on germicidal UV light, IES-CR-2-20-V1a – 2020.04.15.
Lightcare will oversee the proper installation of its special luminaires, the PIR sensors, switches, signage and the education of maintenance personnel.
‘There are not many good things to say about epidemics,’ says Søgaard, ‘but it is forcing industry to innovate and find new solutions. We are Lightcare are constantly striving to create the most value for our customers.’
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