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In regard to estimation and costing of public lighting, which of the following factors is NOT a fundamental criterion for the quality of public lighting?
Limitations of glare
Optical guidance
Level of luminance
Looping-in method
Looping-in method
Quality of public lighting is determined by photometric and physiological parameters that affect visibility and safety. The looping-in method is merely an electrical wiring technique used for distributing power to lighting units and does not influence the optical performance or light quality.
IS 1944: 1970 (Part 1 & 2)
Quality of public lighting is determined by photometric and physiological parameters that affect visibility and safety. The looping-in method is merely an electrical wiring technique used for distributing power to lighting units and does not influence the optical performance or light quality.
L=h2I├Чcos3(╬╕)тАЛ тАФ Luminance L based on luminous intensity I at angle ╬╕ and mounting height h
E=h2I├Чcos3(╬╕)тАЛ тАФ Illuminance E on a horizontal plane
Public lighting quality relies on luminance and illuminance distribution across the road surface. High levels of luminance ensure visibility, while the limitation of glare prevents visual discomfort and transient adaptation problems. Optical guidance refers to the visual cues provided by the light distribution to help drivers perceive road geometry.
Limitations of glare are essential to prevent disability and discomfort glare for road users.
Optical guidance is achieved through the positioning of luminaires to define the road path.
Luminance level is the primary criteria for assessing the adequacy of street lighting as per international standards.
Looping-in is a mechanical/electrical connection method unrelated to light output quality.
Proper glare control improves reaction time.
Uniform luminance reduces driver fatigue.
Poor optical guidance leads to accidents on curves.
Insufficient luminance levels mask road hazards.
Street and highway lighting design
Area lighting for urban security
Looping-in is a method of wiring where the phase and neutral conductors are brought to the lighting terminal to feed subsequent luminaires, simplifying circuit protection and installation.
Options A, B, and C are fundamental visual quality metrics; D is a branch circuit wiring convention.
D is correct тАФ The looping-in method is a wiring technique for electrical distribution and is not a factor for determining the optical or qualitative performance of a public lighting installation.
Always distinguish between 'Performance Criteria' (Photometrics) and 'Installation Method' (Electrical wiring) when analyzing illumination questions.
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