UV Light Sterilization: Over a Century of Proven Results
UV light has been proven to have powerful germicidal benefits, dating back to the late 19th century when Downes & Blunt conducted the first scientific study in 1877 showing the effectiveness of UV light sterilization. As detailed in the public health report, The History of Ultraviolet Germicidal Irradiation for Air Disinfection, it would take many decades for science and medicine to further research and understand the powerful benefits of UV light for sterilization.
Niels Finsen won the Nobel Prize Award in Physiology or Medicine in 1903 for his contribution to the treatment of diseases with concentrated UV light. During the 1930’s, William Wells demonstrated the ability of UV germicidal irradiation to prevent the spread of airborne diseases.
Despite these early proven successes of UV light for sterilization, interest in medical uses and further research of UV light waned until the 1980’s, spurred partly by the increase in tuberculosis (TB). Tuberculosis is the leading cause of adult deaths from a single infectious agent, with a fatality rate of about 23%. UV germicidal lamps are proven highly effective at eliminating tuberculosis when used in wall mounted, upper-room UVGI air purification systems, according to the Rensselaer Polytechnic Institute, Lighting Research Center, Controlling Tuberculosis Transmission with Ultraviolet Irradiation.
Effectiveness of UV Light Germicidal Sterilization
Ultraviolet radiation delivers maximum germicidal effectiveness to inactivate microorganisms when emitted at the optimal wavelength of 253.7 nanometer (nm), referred to as Ultraviolet germicidal irradiation (UVGI). Germicidal effectiveness decreases when emitted at other than optimal wavelengths. This is why high-quality, UV sterilization lamps are so important, to effectively deliver the right amount of UV radiation for the desired application.
UV light sterilization effectively inactivates microorganisms by damaging the DNA of cells. DNA is responsible for cell replication, thus damaging the structure of the DNA renders cells unable to replicate and unable to spread disease. The UV photons are absorbed by the cell, creating pyrimidine dimers. This causes two adjacent thymine or cytosine bases to bond with each other, instead of across the double helix as usual.
A DNA molecule with pyrimidine dimers is unable to function properly, resulting in the organism’s death or inability to replicate. An organism that cannot reproduce is no longer capable of spreading disease.
Quality Lamps Key to Effective UV Light Sterilization
Coolux understand the technology behind ultraviolet light and how to harness the maximum, most optimal nanometer in a wide range of UV sterilization lamp products. We develop custom, proprietary UV lamp solutions to meet your required germicidal specifications in any application. UV sterilization lamps by Coolux can be found worldwide in air, surface and water sterilization applications, providing long-lasting, powerful germicidal effectiveness.
As global leaders in germicidal UVC technologies, we offer OEMs the widest range of standard and highly customized UVC lamps and components available. Our innovative lamps offer safe, effective and affordable solutions in countless industrial applications, while at the same time allowing OEMs to comply with strict local codes and FDA safety regulations.
Our standard UVC germicidal lamps include·
Benefits of UV Light for Sterilization
UV light sterilization is an environmentally friendly method of killing bacteria, mold, fungi, and viruses without the use of harmful chemicals and does not produce corrosive materials or disinfection by-products (DBPs). There are many industries where surface disinfection without the use of chemicals is critical and UV light sterilization can provide a safe, effective solution. UV disinfection and sterilization systems are proven to be:
- Highly effective
- Low maintenance
- Chemical free
UV lamps used are used in a multitude of industries and applications, providing vital solutions to improve the health and wellness of people in residential, commercial and industrial settings. It is used to disinfect the air of transmissible agents, fungi, bacteria, viruses, dust mites and spores.
UV Sterilization Improves Health in Many Industries
UV light sterilization systems are proven to improve the health and wellness of people in many industries and environments. UV sterilization is protecting people against harmful bacteria, viruses, mold and other pathogens in these many industries and applications:
Food Industry – UV lamps are used for irradiation. Ultraviolet light sterilization kills viruses, bacteria, yeast and fungi in seconds, and can also extend shelf life and nutritional value. Food applications include packaging materials, conveyor belts, transport containers, working surfaces, countertops and on liquid-sugar tanks to kill mold and bacteria.
UV Hormesis – a promising new development which is a process that helps to reduce post-harvest losses by delaying the ripening of fruits and vegetables. The technology offers the potential to save a great deal of money in the future.
Residential Air purification – According to Chapter 62 of the ASHRAE handbook, Ultraviolet Air and Surface Treatment, the design objective for in-duct UV light disinfection is to uniformly distribute UV energy in all directions throughout the length of the duct or air-handling unit (AHU). This delivers the appropriate amount of UV dose to air moving through the irradiated zone. Enhancing the reflectivity of the air handling unit’s interior with materials such as aluminum can also improve the UVGI performance as reflecting UVC energy back into the irradiated zone increases the effective UV dose.The American Society of Heating, Refrigerating and Air-Conditioning Engineers, ASHRAE, also state that UV light sterilization systems are able to maintain cleanliness of cooling coil surfaces and condensate pans when installed close to the equipment. The irradiance of in-duct systems should be in the range of 1,000 to 10,000 μW/cm2, although could be lower or higher depending on the application requirements. In-duct air disinfection systems should be designed for worst-case conditions.
Air Purification in Healthcare – A study by Avinash Kulkarni (PhD), Aeropure UV Systems Pvt Ltd, INDIA, examined both Tier 1 and Tier 2 types of UV air purification systems in health care facilities. Tier 1 systems are considered UVGI on Cooling Coils in AHU whereas Tier 2 systems are defined as localized Upper Room UVGI. Studies have repeatedly shown a reduction in bacteria count of 70% to 80% for both Tier 1 and Tier 2 systems.UV germicidal technology is especially important in hospitals and other settings where it is integrated into air conditioning systems to sterilize pathogens that cause illnesses and contaminants that can aggravate respiratory conditions.
Industrial Air Purification – UV lamps are used to remove harmful or toxic chemicals produced in many industries and to reduce or eliminate VOCs and industrial exhausts containing solvents.
Water Sterilization – UV light sterilization is highly effective at eliminating many harmful pathogens from water and kills some bacteria that chlorine does not. UV water disinfection systems are utilized to purify drinking water, to sterilize water in waste water treatment plants, pools and spas, life sciences and many other water applications.
Surface Sterilization – UV lamps are used in many environments such as restaurants to sterilize kitchen equipment and surfaces, hospitals to sterilize medical equipment, food buffets and many other environments where surface sterilization improves public health.