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Lighting R&D Workshop: What is Ideal Light?
Ian Ashdown, P. Eng. (Ret.), FIES Senior Scientist SunTracker Technologies Ltd. U.S. Department of Energy LIGHTING R&D WORKSHOP Co-sponsored by the Illuminating Engineering Society View the full presentation here. Topics Lighting Design Software Today...
Lighting and Acoustics: Know Your Tools
Ian Ashdown, P. Eng. (Ret.), FIES Senior Scientist SunTracker Technologies Ltd. Concordia University April 2022 View the full presentation here. Whether it is in lighting or acoustics, engineering design and analysis invariably involves commercial software design...
Lighting Uniformity in Horticulture
Written in 2015, “Greenhouse Design and Control” (Ponce et al. 2015) is extraordinarily comprehensive in its coverage of greenhouse design issues, from site selection through structural load bearing analysis and ventilation technologies to greenhouse automation using adaptive neural fuzzy inference systems. On the topic of greenhouse lighting, however, it has only this to say: “The light level in the greenhouse should be adequate and uniform for crop growth.”
Modeling Spherical Irradiance for UV-C Air Disinfection
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...
Visible Light Disinfection
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.
Ian Ashdown, Senior Scientist of SunTracker Technologies mentioned in LD+A Magazine
The IES has introduced ANSI/IES RP-45-21, Recommended Practice: Horticultural Lighting, to describe the differences between architectural and horticultural lighting design. The document is paramount for lighting professionals interested in designing atria, greenhouses and indoor farms.
Ian Ashdown, Senior Scientist of All Things Lighting® Association Published in LED Professional Review
What does the metaverse, the promised “next chapter for the internet” (Mark Zuckerberg, 2021), have to do with architectural lighting? It will be after all an immersive virtual world where people will gather to socialize, play, and work.
Quantifying Light Pollution Sources
time light pollution is sadly familiar to all of us. While our grandparents and great-grandparents may talk fondly of seeing the Milky Way in their youth, with thousands of stars scattered across the dark summer sky, we are mostly content with seeing a few dozen stars through the never-ending dusk of urban and suburban skies.
Defining Far-Ultraviolet
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...