The assessment of light sources

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dc.contributor.advisorEinhorn, H Den_ZA
dc.contributor.authorPaul, Brendon Marken_ZA
dc.date.accessioned2016-09-20T12:25:58Z
dc.date.available2016-09-20T12:25:58Z
dc.date.issued1997en_ZA
dc.description.abstractDiscomfort 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.en_ZA
dc.identifier.apacitationPaul, B. M. (1997). <i>The assessment of light sources</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Electrical Engineering. Retrieved from http://hdl.handle.net/11427/21802en_ZA
dc.identifier.chicagocitationPaul, Brendon Mark. <i>"The assessment of light sources."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Electrical Engineering, 1997. http://hdl.handle.net/11427/21802en_ZA
dc.identifier.citationPaul, B. 1997. The assessment of light sources. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Paul, Brendon Mark AB - 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. DA - 1997 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1997 T1 - The assessment of light sources TI - The assessment of light sources UR - http://hdl.handle.net/11427/21802 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/21802
dc.identifier.vancouvercitationPaul BM. The assessment of light sources. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Electrical Engineering, 1997 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/21802en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Electrical Engineeringen_ZA
dc.publisher.facultyFaculty of Engineering and the Built Environment
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherElectrical Engineeringen_ZA
dc.titleThe assessment of light sourcesen_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMScen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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