UVC light has been used for over 70 years to disinfect bacteria, fungi and viruses.

It has been used in TB wards, hospitals and for clean rooms.  New York City is currently using it to disinfect the subway trains in their battle against COVID-19.

How does UVC light work? 

With viruses the light gets into the cell and begins to damage the DNA and RNA making it non-infectious thereby reducing infection and spread rate of the virus.  A scientist at Emery University has confirmed the effectiveness of UVC light against the Corona virus.

Light spectrum of 254 nm has been shown to be effective after about 15 minutes of exposure.  This is a spectrum that is harmful to eyes and skin, so it needs to be used with caution.  These lights are used in either a room that is empty or I have a 2x4 fixture that uses this UVC light to clean the air with no light being dispersed in the room.  It shows a 99.9% effectiveness.

Far- UVC light spectrum of 222 nm has also been shown to be effective with over 90% elimination and is safe to be around, numerous studies have shown no human harm with contact with this light.  This light requires as little as 20 seconds to effectively penetrate and inactivate bacteria and viruses.