I learned last week about the existence of special ‘germicidal’ lights at the 405nm light wavelength. Such lights are sometimes erroneously classified as UV lights; however, by definition, the Ultraviolet spectrum of light is between 100-400nm. Thereby any light at 405nm is within the visible light spectrum. Light in the visible spectrum doesn’t pose the health risks that typical UVC germicidal lights cause and is said to be safe for use in occupied spaces.
I was alerted to the use of 405nm lights for sanitization from a most helpful representative at our local Dealer’s Electrical shop. My rep introduced my to the Spectra Clean series by Hubbell and I was instantly interested. Apparently these are back ordered through December due to high demand, including from local school districts. For one 4 foot single light fixture the price is somewhere near $1200. I can only imagine how much a local school is spending on installing these lights throughout a cafeteria!
I decided to reach out to Hubbell for more information on their product. My online request was promptly addressed by a company representative, saying: “See links below for information on SpectraClean. Will not work against COVID-19.” What??? Won’t work against Covid-19?? I’m curious what is so valuable about these lights that cost more than a grand each and don’t do anything to address the primary current global pandemic!
As a reference, typical UVC germicidal lights cost in the ballpark of $50 for a 4 ft fixture and bulb. A nicer fixture with a cover shouldn’t add that much more!
So, it seems that if one has a budget to support 405nm lights, they can prove useful in killing bacteria in food preparation areas and elsewhere. As the light is not harmful, these can be run 24-7, including in occupied spaces. A valuable technology no doubt. I’ll be staying tuned for when prices drop, dramatically! Its hard to justify such a high investment when these lights don’t kill viruses such as Covid-19.