Ultraviolet germicidal irradiation (UVGI) is a disinfection method that uses short-wavelength ultraviolet (UV-C) light to inactivate microorganisms by destroying nucleic acids and disrupting their DNA making them unable to reproduce.
UV-C light is weak at the Earth’s surface as the ozone layer of the atmosphere filters is out. So we have to use UV-C light sources to create the inhospitable environment for microorganisms such as bacteria, viruses, molds and other pathogens leading to the death of this microbes.
UV-C disinfection has been used in medical sanitation and sterile work environment since the mid-20th century and is well researched confirming disinfection rates of up to 99.99% by many international studies.
Even UV-C disinfection is highly effective, there are still limitations and important considerations necessary by using it in daily life.
Wavelength of UV-C
Ultraviolet (UV) radiation is a form of electromagnetic radiation. The sun is the main source of UV radiation which is divided into 3main groups: UV-A (400-315nm), UV-B (315-280nm) and UV-C (280-100nm). Decreasing wavelengths correspond with higher frequency radiation and a higher amount of energy per photon. About 95% of the UV rays from the sun that reach the ground are UV-A rays, with the remaining 5% being UV-B rays. UV-C rays are filtered out by our atmosphere. But UVC rays can also come from some man-made sources, such as arc welding torches, mercury lamps, UV sanitizing bulbs and UV LEDs.
How UV-C disinfection works
The UV-C radiation is the strongest wavelenght in the UV spectrum and most absorbed in materials, both organic and inorganic. It is sufficiently energetic that individual photons produce chemical bond breakage of the DNA of viruses, bacteria and germs which are finally leading to the death of this microbes.
UV-C surface disinfection
Linear downlight LED UV – C
The linear downlight with matt aluminium reflector is compact and easy to install by just 2 springs. Due to the compact size in can be integrated to many applications.
Central Bluetooth driver
The driver can operate up to 4 linear UV-C downlights. This lowers the system costs and installation time significantly.
Bluetooth room sensor
The sensor detects movements inside the room and provides the signal to interrupt the disinfection mode.
Bluetooth door sensors
In case of additional needed protection, the door sensor detects a door opening and interrupts the disinfection mode. It can also be triggered to start the disinfection program automatically when the doors are being closed.
Bluetooth disinfection sign
It is good to highlight with a simple illuminated sign outside the room an ongoing disinfection sequence. With help of a simple bluetooth relay the sign will be activated parallel with the UV-C downlights.
Plug & Play cabeling solution
Nothing is easier as just connect the UV-C downlights and the driver with simple fast connectors. The cabeling solution consist of T dividers, 1m, 2m and 3m extensions.
Safety considerations first
Safety first is our motto when we talk about UV-C disinfection. Thats why we developed an optical system which is preventing the direct view to the UV-C LEDs. We keep the radiation of UV-C light as low as possible but still enough for the needed UV-C disinfection.
To avoid direct exposure to the UV-C light the systems use additional sensors for movement detections. Additional, the sign which can be even installed also outside the application area show he ongoing disinfection mode.
Reduce costs for manual disinfection
UV-C light is an innovative ozone free disinfection solution and reduces the costs for disinfection liquids and required manpower.
For example, scissors and knifes are staying sharp and do not get effected by the agressive alcohol disinfection, which lead to additional maintenance reduction.
Optical efficiency for low system costs
By use of UV-C LEDs with primary optics, the energy is directly distributed to the environment with a beam angle of 60 degrees. That means that no secondary optic is required. There is no reduction of the optical power caused by secondary optics.
There is no trans-formation of wavelengths due to other optical materials or unwished energy absorption.
Flexibility and scaleability
We offer solutions which are either solo operating as pure disinfection systems or integrate them into existing LED luminaires. Very interesting is the integration to our suspended wood luminaire portfolio. The compact linear UV-C downlight can also be modified to fit in existing profiles and track rail systems.
Just ask us about the needed customization.
Fast installation for easy adaptation
Due to the plug & play system including cabling with fast connectors the system allows a fast and simple installation.There is no need to make programming on side. We can provide this already as factory setup. That means for you:
Connect the power and let the system do the UV-C disinfection.
Automatic schedules and scenes
The bluetooth integration make the control easy. There is basically no need for wiring of additional control cables or switches. Schedules and scenes are programmed via smart-phone or tablets and start automatically. The wire-less remote controller is the perfect tool for administrators to interact manually on demand and avoids that people without authority can make any changes.
Important considerations for surface disinfection
Effect on skin and eyes
UV rays, either from the sun or from artificial sources like tanning beds, can cause sunburns. Depending on the energy and time, exposure to UV rays (290-400 nm) can result to premature aging of the skin and signs of sun damage such as wrinkles, leathery skin, liver spots, actinic keratosis, and solar elastosis. The absorption length of UV-C radiation in human skin is extremely short so that almost no radiation can reach the living cells in the skin; all the absorption occurs in the dead cell layers. The eye is most sensitive to damage by UV in the lower UV-C band at 265–275 nm. It can cause the cornea (on the front of the eye) to become inflamed or burned. They can also lead to the formation of cataracts (clouding of the lens of the eye) and pterygium (tissue growth on the surface of the eye), both of which can impair vision.
Following the DIRECTIVE 2006/25/EC OF THE EUROPEAN PARLIAMENT the exposure limit value for UV (180-400nm) is 30 J/m2 (daily value of 8 hours).
Effect on materials
As UV-C is the strongest UV wavelength. It is most absorbed in organic and unorganic materials, in wrong use it can effect flowers, furnitures and other products. On the other side, the intensity from point sources like UV-C LEDs falls off as 1 over distance squared, and once it gets past the scattering length, it falls off exponentially. Therefore, UV-C disinfection is always a project, which cannot be done without the correct understanding and knowledge about the application area and way of using.Very sensitive are situations where people get involved.
UV-C air disinfection
How air disinfection works
The device is used for disinfection of air contaminated by bacteria and viruses. Lamp uses UVC radiation with dominant wavelength of 254 nm. UVC source is placed in air tunnel with vent, where air is flowing through in close vicinity to UVC source.
Distance from lamp is short and gives high radiation intensity due to size of air tunnel and reflective inner surface. Disinfection begins once air pass through the tunnel. It is designed to operate during presence of people by keeping UV-C radiation inside the lamp.
Adjustment of air flow
Because different bacteria and viruses need different dose (UVC intensity x time) user can simply adjust the flow rate via touch screen.
The maximum flow rate is 75 m3 / hour. We recommend to run the system with 50% air flow and a cleaning duration cycle of 2 hours.
Disinfection when needed
The presence detector recognize movement of people inside the room and switch on the device automatically. The cleaning time can be adjusted as well and starts after last movement was detected. This is also benefical not to waste the lifetime of the tube and keeping the energy consumption as low as possible.
The brightness of the display is adjusting during the night. There is no disturbing light level during the sleep.
Notification of maintenance
The device shows you on the touch screen the end of life of the tube and reminds you to replace.
The same is valid for the fan.
One device, 3 mounting types
Depending on the application area decide beetween the wall mounted, table and floor standing positioning of your cleaning device.
Attention: The accessories need to be purchased separately.