Day Lighting Archives - All Things Lighting® Association https://www.allthingslighting.org/category/academic-articles-and-research/day-lighting/ Illuminating the Complicated! Fri, 01 May 2026 20:12:53 +0000 en-US hourly 1 https://www.allthingslighting.org/wp-content/uploads/2023/08/cropped-ATLA-favicon2-32x32.jpg Day Lighting Archives - All Things Lighting® Association https://www.allthingslighting.org/category/academic-articles-and-research/day-lighting/ 32 32 Intro to Horticultural Lighting https://www.allthingslighting.org/intro-to-horticultural-lighting/ https://www.allthingslighting.org/intro-to-horticultural-lighting/#respond Wed, 04 Feb 2026 17:40:12 +0000 https://www.allthingslighting.org/?p=5282 Introduction This article is based on a presentation I had the pleasure of delivering at the recent Canada Light Expo 2025 in Toronto. My aim with the presentation was to offer a brief overview of some key aspects of horticultural lighting and to highlight how it differs from architectural lighting. I was surprised by the […]

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]]> https://www.allthingslighting.org/intro-to-horticultural-lighting/feed/ 0 Climate-based Annual Daylight Modelling for Greenhouses with Supplemental Electric Lighting https://www.allthingslighting.org/climate-based-annual-daylight-modelling-for-greenhouses-with-supplemental-electric-lighting/ https://www.allthingslighting.org/climate-based-annual-daylight-modelling-for-greenhouses-with-supplemental-electric-lighting/#respond Fri, 22 May 2020 17:26:52 +0000 https://www.allthingslighting.org/?p=1831 Recent advances in LED-based luminaire design have enabled greenhouse operators to temporally control both the photon flux density and spectral irradiance incident upon the plant canopy.

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]]> https://www.allthingslighting.org/climate-based-annual-daylight-modelling-for-greenhouses-with-supplemental-electric-lighting/feed/ 0 Solar Illumination https://www.allthingslighting.org/solar-illumination/ https://www.allthingslighting.org/solar-illumination/#respond Fri, 15 Feb 2019 22:39:56 +0000 https://www.allthingslighting.org/?p=280 Ian Ashdown, P. Eng., FIES, Senior Scientist, SunTracker Technologies Ltd.    Published: 2015/01/21 Lighting design is based in part on the reasonable assumption that photometric units have precise definitions. The candela, for example, has a precise mathematical definition: “The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation […]

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]]> https://www.allthingslighting.org/solar-illumination/feed/ 0 Cerise365 and DAYSIM https://www.allthingslighting.org/cerise365-and-daysim/ https://www.allthingslighting.org/cerise365-and-daysim/#respond Fri, 15 Feb 2019 22:03:36 +0000 https://www.allthingslighting.org/?p=260  Ian Ashdowna, Chris Jacksonb, Joel Spahnc, Todd Saemischd  a. SunTracker Technologies Ltd., Victoria, Canada. b. Lighting Analysts Ltd., London, UK. c, d. Lighting Analysts Inc., Littleton, CO. Published: 2017/02/11 (Updated 2021/04/12) Ceriss365 and DAYSIM are daylighting analysis software programs that perform climate-based annual daylight simulations, including the calculation of annual daylight metrics. This white paper […]

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]]> https://www.allthingslighting.org/cerise365-and-daysim/feed/ 0 Daylight Factors https://www.allthingslighting.org/daylight-factors/ https://www.allthingslighting.org/daylight-factors/#respond Fri, 15 Feb 2019 21:02:46 +0000 https://www.allthingslighting.org/?p=229 Ian Ashdown, P. Eng., FIES,Senior Scientist, SunTracker Technologies Ltd. Published: 2014/03/05  Nine out of ten daylight simulation programs agree … and therein lies a story worth retelling. Daylight in History The story begins in the sixth century with the publication of Corpus Juris Civilis (“Body of Civil Law”) by order of the eastern Roman emperor […]

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]]> https://www.allthingslighting.org/daylight-factors/feed/ 0 Climate-Based Daylight Modeling https://www.allthingslighting.org/climate-based-daylight-modeling/ https://www.allthingslighting.org/climate-based-daylight-modeling/#respond Fri, 15 Feb 2019 00:58:29 +0000 https://www.allthingslighting.org/?p=186  Ian Ashdown, P. Eng., FIES, Senior Scientist, SunTracker Technologies Ltd. Published:  2016/03/26 daylight, n. The light of day. Apart from having a wonderfully circular definition in most English-language dictionaries, daylight really is just another form of illumination. As such, most people would expect lighting designers to be able to simulate daylight with the same ease […]

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