Lighting Assessment WAI-985-000-REPLC-0019_Rev 0.Docx Waihi North Project Page 11 of 35 21/06/2022 Assessment of Environmental Effects: Lighting REVISION: 0 - Final The extent of sky glow that occurs is affected not just by the amount of light that is directed into the sky, but also the climatic conditions. More sky glow is apparent when there are particles in the air for the light to reflect off. This occurs in cloudy, foggy, and drizzly conditions, and if there are dust particles in the air. The Hauraki District Plan does not mention sky glow. AS/NZS 4282 identifies the following light technical parameter related to glare: a. LTP Upward Light Ratio (ULR): “The proportion of flux of a luminaire and / or installation that is emitted, at and above the horizontal, excluding reflected light, when the luminaire(s) is/are mounted in its installed position(s). ULR = upward flux/total flux from the luminaire.” (Definition from AS/NZS 4282: 2019). To minimise sky glow, all luminaires would ideally be of the type that emit zero light above the horizontal plane. Guidance is provided within AS/NZS 4282:2019, specifically Appendix A Section A3.2 “Selection of luminaires”, which notes: “The selection of luminaires can have a significant effect on the ability to control the light that is emitted outside the boundary of the properties. It is important that the selected luminaire has a light distribution that is appropriate not only for the overall lighting task but also to minimize obtrusive light. As a general principal [sic] lighting installations that control obtrusive light well will be generally more efficient at lighting the task. Figure A1 (Figure 3) gives simplified indication of the different types of luminaires and the impact that it has on obtrusive light. It shows preferred and non-preferred luminaire light distributions. Figure A2 (Figure 4) indicates how the distribution of the luminaire can affect the ability to control obtrusive light. Avoid the use of luminaires that have wide distribution and do not have the ability to limit the spread of light.” Figure 3: AS/NZS 4282: 2019 Appendix a Figure A1
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