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Defining Far-Ultraviolet

Defining Far-Ultraviolet

by Ian Ashdown | Nov 12, 2021 | Blog, General, Germicidal, Health, Lighting Fundamentals, Ultraviolet Radiation

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...

Ultraviolet Radiation Terminology

Ultraviolet Radiation Terminology

by Ian Ashdown | Sep 14, 2020 | Blog, Germicidal, Health, Lighting Fundamentals, Ultraviolet Radiation

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...

Spherical Irradiance and Aerosols

Spherical Irradiance and Aerosols

by Ian Ashdown | Aug 20, 2020 | Blog, General, Germicidal, Health, Lighting Fundamentals, Ultraviolet Radiation

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...

Photometry and Photosynthesis

Photometry and Photosynthesis

by Ian Ashdown | Feb 15, 2019 | Blog, Horticulture, Lighting Fundamentals

Ian Ashdown, P. Eng., FIES, Senior Scientist, SunTracker Technologies Ltd.   Published: 2014/12/10 UPDATE 15/04/13 -- This article was first published on December 10, 2014. A revised version was published as "LED Lighting for Horticulture" in the Mar/Apr 2015...

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