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The assessment of light sources
Discomfort glare from normal sources has been thoroughly researched over the last five decades and agreement has been reached by the CIE to express it by the Unified Glare Rating (UGR) formula: UGR = 8 log₁₀g where: g = (0.785/Eᵢ)Σ(L²ω/p²) (see Glossary) Hardly any research, however, has been done o...
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| Format: | Thesis |
| Language: | English |
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Department of Electrical Engineering
2016
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| _version_ | 1867613150704041984 |
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| access_status_str | Open Access |
| author | Paul, Brendon Mark |
| author2 | Einhorn, H D |
| author_browse | Einhorn, H D Paul, Brendon Mark |
| author_facet | Einhorn, H D Paul, Brendon Mark |
| author_sort | Paul, Brendon Mark |
| collection | Thesis |
| description | Discomfort glare from normal sources has been thoroughly researched over the last five decades and agreement has been reached by the CIE to express it by the Unified Glare Rating (UGR) formula: UGR = 8 log₁₀g where: g = (0.785/Eᵢ)Σ(L²ω/p²) (see Glossary) Hardly any research, however, has been done on discomfort glare from small sources, so the definition of a small source was just not known. It was not known whether to define it as an effective solid angle, ros or area, As. Two hypotheses were put forward concerning the effective size of a small source: Hypothesis # 1 ('constant omega' hypothesis) The effective size of a small source has a solid angle, ros. Any source with an actual solid angle less than ros shall be considered a small source and will have an effective solid angle equivalent to ros when viewed off the line of sight (LoS). This solid angle, ros is a constant. i.e. it remains the same irrespective of distance from the source. Hypothesis # 2 ('constant area' hypothesis) The effective size of a small source has an area, As. Any source with a projected area less than As shall be considered a small source and will have an effective area equivalent to As when viewed off the line of sight (LoS). This area, As is a constant. i.e. its solid angle varies inversely proportional to the square of the distance from the source. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/21802 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:31:34.243Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| publisher | Department of Electrical Engineering |
| publisherStr | Department of Electrical Engineering |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/21802 The assessment of light sources Paul, Brendon Mark Einhorn, H D Electrical Engineering Discomfort glare from normal sources has been thoroughly researched over the last five decades and agreement has been reached by the CIE to express it by the Unified Glare Rating (UGR) formula: UGR = 8 log₁₀g where: g = (0.785/Eᵢ)Σ(L²ω/p²) (see Glossary) Hardly any research, however, has been done on discomfort glare from small sources, so the definition of a small source was just not known. It was not known whether to define it as an effective solid angle, ros or area, As. Two hypotheses were put forward concerning the effective size of a small source: Hypothesis # 1 ('constant omega' hypothesis) The effective size of a small source has a solid angle, ros. Any source with an actual solid angle less than ros shall be considered a small source and will have an effective solid angle equivalent to ros when viewed off the line of sight (LoS). This solid angle, ros is a constant. i.e. it remains the same irrespective of distance from the source. Hypothesis # 2 ('constant area' hypothesis) The effective size of a small source has an area, As. Any source with a projected area less than As shall be considered a small source and will have an effective area equivalent to As when viewed off the line of sight (LoS). This area, As is a constant. i.e. its solid angle varies inversely proportional to the square of the distance from the source. 2016-09-20T12:25:58Z 2016-09-20T12:25:58Z 1997 Master Thesis Masters MSc http://hdl.handle.net/11427/21802 eng application/pdf Department of Electrical Engineering Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Electrical Engineering Paul, Brendon Mark The assessment of light sources |
| thesis_degree_str | Master's |
| title | The assessment of light sources |
| title_full | The assessment of light sources |
| title_fullStr | The assessment of light sources |
| title_full_unstemmed | The assessment of light sources |
| title_short | The assessment of light sources |
| title_sort | assessment of light sources |
| topic | Electrical Engineering |
| url | http://hdl.handle.net/11427/21802 |
| work_keys_str_mv | AT paulbrendonmark theassessmentoflightsources AT paulbrendonmark assessmentoflightsources |