Eric Bretschneider, Ph.D, Author at All Things Lighting® Association https://www.allthingslighting.org/author/eric/ Illuminating the Complicated! Sat, 01 Aug 2026 00:37:02 +0000 en-US hourly 1 https://www.allthingslighting.org/wp-content/uploads/2023/08/cropped-ATLA-favicon2-32x32.jpg Eric Bretschneider, Ph.D, Author at All Things Lighting® Association https://www.allthingslighting.org/author/eric/ 32 32 Technical Report: The Mathematics of Orbital Solar Reflectors https://www.allthingslighting.org/technical-report-the-mathematics-of-orbital-solar-reflectors/ https://www.allthingslighting.org/technical-report-the-mathematics-of-orbital-solar-reflectors/#respond Fri, 31 Jul 2026 21:43:15 +0000 https://www.allthingslighting.org/?p=5414 Technical Report: The Mathematics of Orbital Solar Reflectors I. Executive Summary At the time of their original submission to the FCC for launch approval, Reflect Orbital claimed they would be able to deliver illuminances up to 5x that of a full moon (1.6 lux). A previous technical report found Reflect Orbital’s Earandil-1 satellite posed a […]

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]]> https://www.allthingslighting.org/technical-report-the-mathematics-of-orbital-solar-reflectors/feed/ 0 Technical Report: Photobiological Hazard Assessment of Orbital Solar Reflectors https://www.allthingslighting.org/technical-report-photobiological-hazard-assessment-of-orbital-solar-reflectors/ https://www.allthingslighting.org/technical-report-photobiological-hazard-assessment-of-orbital-solar-reflectors/#respond Fri, 01 May 2026 20:08:58 +0000 https://www.allthingslighting.org/?p=5330 Executive Summary This report details a photobiological hazard assessment of the general concept of Orbital Solar Reflectors (OSRs). A recent proposal, Reflect Orbital’s proposed Earendil-1 satellite is used as an exemplar. The analysis was conducted following IEC 62471:2006 Photobiological Safety of Lamps and Lamp Systems. OSRs are intended to provide primary or supplemental lighting and […]

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]]> https://www.allthingslighting.org/technical-report-photobiological-hazard-assessment-of-orbital-solar-reflectors/feed/ 0 Refinements to the Worthing Relationship – A Quantum Version of Wien’s Displacement Law https://www.allthingslighting.org/refinements-to-the-worthing-relationship-a-quantum-version-of-wiens-displacement-law/ https://www.allthingslighting.org/refinements-to-the-worthing-relationship-a-quantum-version-of-wiens-displacement-law/#respond Wed, 05 Nov 2025 00:00:55 +0000 https://www.allthingslighting.org/?p=5227 Refinements to the Worthing Relationship – A Quantum Version of Wien’s Displacement Law Eric Bretschneider, Ph.D. Abstract Wien’s Displacement Law is a simple equation that allows calculation of the peak wavelength for a black body light source as a function of temperature. However, not all uses of light are based on radiant flux. In particular, […]

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]]> https://www.allthingslighting.org/refinements-to-the-worthing-relationship-a-quantum-version-of-wiens-displacement-law/feed/ 0 Can Designs and Measurements Based on the Circadian Stimulus Model Stand the Test of Time? https://www.allthingslighting.org/can-designs-and-measurements-based-on-the-circadian-stimulus-model-stand-the-test-of-time/ https://www.allthingslighting.org/can-designs-and-measurements-based-on-the-circadian-stimulus-model-stand-the-test-of-time/#respond Tue, 13 Aug 2024 06:01:18 +0000 https://www.allthingslighting.org/?p=4817 Author: Eric Bretschneider, Ph.D INTRODUCTION When considering the potential circadian impact of lighting, lighting designers have a choice between three different models: melanopic equivalent daylight illuminance, or m-EDI [CIE 2018]; equivalent melanopic lux, or EML [WELL v2]; and circadian light, or CLA [UL 2019]. Both m-EDI and EML have a continuous action spectrum, which means […]

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