AS NZS 1158.2:2020 pdf download.Lighting for roads and public spaces Part 2: Computer procedures for the calculation of light technical parameters for Category V and Category P lighting.
2.2 CATEGORY P LIGHTING SCHEME DESIGNS 2.2.1 Evaluation of performance Conformance with AS/NZS 1158.3.1 is based on a lighting scheme achieving prescribed values of LTPs. These LTPs and the values required for conformance are given in AS/NZS 1158.3.1. The LTPS are reproduced in Table 2.2 and defined in Clauses 2.2.3 and 2.2.4. The illuminance-based LTPs are each derived, directly or indirectly, from the illuminance distribution over a designated field of interest. This area, the calculation field, is represented by a finite grid of calculation points. The relevant calculation fields for the applicable road reserves, pathways and spaces are described in Section 3. The illuminance requirements of Category P lighting are referenced either to a horizontal plane at ground level or a vertical plane. The glare control characteristics required of luminaires are given in AS/NZS 1158.3.1. Since the required conformance values are maintained values, it is essential that those LTPs that are expressed in absolute terms, that is En, Eph and Epv are calculated using a maintenance factor. Where Epv is used for obtrusive light calculations the maintenance factor shall be 1 .0.
New Zealand For the evaluationof L，Uo, UL, an observer shall be placed halfway across each of the lanes of the driver s section of the carriageway, 60 m before the commencement of the calculation field, at a heightofl.5 m above the carriageway. NOTE: This is illustrated by examples in Figure 3.4(b). TI It shall be assumed that the screening angle of a car roof is 20°，which means that luminaires placed above this inclined plane are not included in the glare calculation. The observer’s eye position is at a height of 1.5 m above the carriageway and is longitudinally set back to coincide with the same 20° inclined shielding plane that includes the first luminaire in the veiling luminance calculation. The direction of the observer’ s line of sight is looking longitudinally forward and down towards a point on the carriageway 90 m horizontally distant. The transverse positions for the observer are the same as in A and B.AS NZS 1158.2 pdf download.