The Power of UVC LEDs
UVC Disinfection is Fast & Effective on Surfaces in Line of Sight
Disinfection performance is a function of the UVC dose applied to the microorganism. While all micro-organisms respond to UVC light in different ways, if given the appropriate dose, which is the product of UVC power multiplied by time, we can kill 99.99% of micro-organisms.
What is UV Disinfection?
Microorganisms such as bacteria, viruses, cysts and mold are simple life forms that reproduce by subdivision, budding or by producing spores. Reproduction of these organisms is vital to their life cycle: loss of their ability to grow and multiply is classified as cellular death, and renders them harmless and no longer pathogenic.
When exposing microorganisms to UVC light, the light penetrates through their cell walls and disrupts the structure of their DNA molecules, prohibiting reproduction.
Because UV disinfection does not rely on chemicals or filtration materials, it can be used effectively and safely in many applications including in drinking water, in air.
How is UV Light Generated?
The traditional approach to generating UV light for disinfection applications is by using the mercury discharge lamp: simply put, a fluorescent bulb without the phosphor coating. Mercury lamps come in two main types: a low-pressure lamp that produces a single wavelength at 254nm; and a medium pressure lamp that emits a multiple wavelength output.
A new germicidal light source is now available: UV LEDs will open new markets in UV disinfection where traditional lamps cannot be used.
Using Germicidal UV LEDS:
Many people consider UV LED advantages of size, weight, power consumption and lifetime, but there are additional advantages from this new technology:
Unlike traditional light sources, whose output wavelength is fixed, UV LEDs can be manufactured to operate at the optimum wavelength for the application: 265nm is widely recognized as the peak absorption of DNA; however, SETi has demonstrated that the peak disinfection efficacy of E.coli in water occurs at 275nm.
UV LEDs also switch on and off instantly and can actually be pulsed without any detriment to lifetime, making them more user-friendly and safer for the operator.
The design rules for UV LEDs open new opportunities of what can be disinfected: we are no longer limited to a long tube, but can mount the LEDs in flat panels; on flexible circuit boards; on the outside of cylinders; the options are almost endless.