Forum for Illumination Research, Engineering, and Science (FIRES)

Standards Category: Ultraviolet Radiation
Figure 1. Germicidal response function for ultraviolet radiation (adapted from CIE 2003).

Ultraviolet Radiation Terminology

By Ian Ashdown, P. Eng., FIES
Senior Scientist, SunTracker Technologies Ltd.

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. Read More

Designing a UV-C Germicidal System

Designing a UV-C Germicidal System

By Ian Ashdown, P. Eng., FIES
Senior Scientist, SunTracker Technologies Ltd.

Germicidal lamps emitting ultraviolet-C (UV-C) radiation have been in use since the 1930s (Wells and Wells 1936). These are most commonly low-pressure mercury-vapor discharge lamps, which are basically fluorescent lamps without a phosphor coating and fused quartz rather than borosilicate glass bulbs. They emit monochromatic radiation mostly at 254 nm, a wavelength that is very effective in disrupting the DNA of viruses, bacteria, and other pathogens. Read More