Germicidal Archives - All Things Lighting® Association

Modeling Spherical Irradiance for UV-C Air Disinfection

Shirley Lang — Fri, 20 May 2022 13:29:02 +0000

We have been using ultraviolet radiation as a means of disinfection for over a century. However, it has been the unfortunate events of the past year that have led to an explosion of interest in ultraviolet germicidal irradiation (UVGI) systems. From mercury vapour and pulsed xenon lamps to excimer lamps and ultraviolet LEDs, there have […]

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Visible Light Disinfection

Shirley Lang — Thu, 19 May 2022 19:45:38 +0000

In summary, visible light disinfection technology may be useful in some applications, but it is by no means a panacea. When designing or specifying a disinfection system, both the lighting designer and the client will need to thoroughly understand the capabilities and limitations of the technology, and agree upon its purpose.

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Defining Far-Ultraviolet

Shirley Lang — Fri, 12 Nov 2021 00:00:49 +0000

In these uncertain times, there is increasingly persuasive evidence that “far-UV” radiation is effective in inactivating the SARS-CoV-2 virus and other pathogens, but without the health risks of germicidal ultraviolet radiation. Unfortunately, this technology has some of the hallmarks of a “miracle cure,” which has become an irresistible attractant for charlatans and hucksters of all […]

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Ultraviolet Radiation & Viral Misinformation

Shirley Lang — Mon, 04 Jan 2021 04:19:44 +0000

Let me begin with a smorgasbord of headlines: 99.9% of Covid-19 virus dead in 30 seconds with UV LEDs, says Tel Aviv research (www.malaysianow.com) UV-emitting LED lights found to kill coronavirus (www.sciencedaily.com) Study reveals UV LED lights effectively kill a human coronavirus (www.medicalnewstoday.com) You can kill Covid with a flick of a switch, study shows […]

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Ultraviolet Radiation Terminology

Shirley Lang — Mon, 14 Sep 2020 05:03:03 +0000

A word of caution: I am going to be annoyingly pedantic here, but with good reason. The lighting industry has a century-long history of introducing unfamiliar technologies using familiar terminology. We later come to regret our choice of words when it becomes necessary to express precisely what we mean. Consider, for example, the term luminance. […]

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Spherical Irradiance and Aerosols

Shirley Lang — Thu, 20 Aug 2020 05:12:29 +0000

Lighting designers will be familiar with the illuminance of a planar surface, which is measured in lumens per square meter (or foot). The irradiance of a planar surface by a germicidal radiation source is conceptually the same, except that it is measured in watts per square meter (W/m2). Most designers, however, will not be familiar […]

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