Alexander Willemsen, Author at All Things Lighting® Association https://www.allthingslighting.org/author/alexander/ 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 Alexander Willemsen, Author at All Things Lighting® Association https://www.allthingslighting.org/author/alexander/ 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 Finding the Danger Zone of the Circadian Stimulus Model: A Summary https://www.allthingslighting.org/finding-the-danger-zone-of-the-circadian-stimulus-model-a-summary/ https://www.allthingslighting.org/finding-the-danger-zone-of-the-circadian-stimulus-model-a-summary/#respond Tue, 04 Nov 2025 23:55:01 +0000 https://www.allthingslighting.org/?p=5248 Author: Alexander Willemsen, Degree of Master of Science of Engineering Based on a paper authored by Eric Bretschneider, Ph.D. The Circadian Stimulus (CS) model is one of the most well-known models for quantifying the circadian impact of lighting. One striking feature that separates the model from other contemporary circadian lighting models is its discontinuous action […]

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