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All Things Lighting® Association Annual Review – 2016
Ian Ashdown, P. Eng., FIES, Senior Scientist CONTENTS ARCHITECTURAL Sports Lighting Regulations HORTICULTURAL Phytochrome and PSS ENTERTAINMENT Controlling Multicolor LED Luminaires DAYLIGHTING Climate-Based Daylight Modelling LIGHT POLLUTION Mobile Light Pollution...
All Things Lighting® Association Annual Review – 2015
Ian Ashdown, P. Eng., FIES, Senior Scientist CONTENTS ARCHITECTURAL The Kruithof Curve Kruithof Revisited HEALTH Entraining Circadian Rhythms Seeing Ultraviolet DAYLIGHTING Solar Illumination LIGHT POLLUTION Light Pollution and Uplight Ratings Color Temperature and...
All Things Lighting® Association Annual Review – 2014
Ian Ashdown, P. Eng., FIES, Senior Scientist CONTENTS GENERAL INFORMATION Mesopic Photometry and Statistics - April 21 2014 Solid Angles - July 26 2014 In Search of Luminance - Nov 18 2014 ARCHITECTURAL Thoughts on Color Rendering - Jan 5 2014 Giving Light - May 12...
All Things Lighting® Association Annual Review – 2013
Ian Ashdown, P. Eng., FIES, Senior Scientist, SunTracker Technologies Ltd. Published: 2013/10/08 Topic: Understanding Mesopic Photometry If you are involved with outdoor area or roadway lighting design, you will undoubtedly encounter such terms as mesopic...
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.