Activities per year
Abstract
The limiting photometric distance (LPD) demarcates the boundary between the far -field and near-field regions of a light source, where the validity of the point source approximation and the application of the inverse square law can be upheld. Traditionally, this distance is determined along the optical axis and is considered universally applicable to all emission angles. However, for cos𝑛-distributed, rotationally symmetric light sources, an angular dependence is observed contingent on the beam width. Beyond a certain angle, the LPD for narrow beam light sources surpasses that along the optical axis in off-axis directions, indicating the invalidity of the point source approximation as defined on-axis. Therefore, an angular range is derived wherein the illuminance can be computed utilising the inverse square law, with errors of 1 % or less compared to exact solutions. This range is defined for square and round emitters based on their full-width at half-maximum angles.
Original language | English |
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Title of host publication | Proceedings of the 30th Session of the CIE |
Place of Publication | Vienna |
Publisher | International commission on illumination |
Pages | 979-989 |
Number of pages | 11 |
ISBN (Electronic) | 978-3-902842-77-0 |
DOIs | |
Publication status | Published - 29 Dec 2023 |
Event | CIE Quadrennial Meeting - Cankarjev dom - Congress Centre Ljubljana, Ljubljana, Slovenia Duration: 18 Sep 2023 → 20 Sep 2023 |
Conference
Conference | CIE Quadrennial Meeting |
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Country/Territory | Slovenia |
City | Ljubljana |
Period | 18/09/23 → 20/09/23 |
Activities
- 1 Talk or presentation at a conference
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Angular Dependency Of The Limiting Photometric Distance
Guillaume Dotreppe (Speaker)
15 Sep 2023 → 23 Sep 2023Activity: Talk or presentation › Talk or presentation at a conference