Street, road and site lighting

What the facility needs

Street lighting is calculated on the carriageway surface. ShNK 2.01.05-24 (table 15) sets the average luminance of an improved surface and, as an alternative, the average horizontal illuminance: category B streets 0.6-1.0 cd/m² or 10-15 lx depending on traffic intensity, category V service roads 0.3-0.4 cd/m² or 4-6 lx; factory forecourts 10 lx (table 16). Uniformity: Lmin/Lmax at least 0.4 (clause 93), and for open areas Emax/Eavg at most 3:1 (clause 105): what matters is the minimum between the columns, not the maximum under one. Two numbers decide it: the column height and the spacing.

The second condition is the climate: Tashkent reached +44.3 °C on 19 July 2026, and during the dust storm of May 2025 PM10 reached 1,585 µg/m³ against a limit of 500. The housing goes well past +70 °C in the sun, and whether the flux survives to the third summer depends on how heat leaves it.

Why this series

Classic is mounted on a bracket, IP65, installed at 2 to 12 m. The extruded aluminium housing works as the heat sink.

Three colour temperatures: 3000 K for residential streets, 4000 K for site roads, 6500 K where the surface needs contrast.

Typical layout

An internal site road of ≈ 800 m, 7 m wide, 8 m columns, category V:

• SKU 01 Classic 100W, spacing ≈ 30 m, single-sided arrangement, ≈ 27 pcs
• installed load ≈ 2.7 kW

The Classic 100W flux is 13,000 lm per the header of the 2018 IES file; the file itself does not agree with its own curve (explained on the model page), so the figure is a calculated one. Flux-per-span method: E = F × UF × MF / (spacing × width) with UF 0.35 (the share of flux landing on the carriageway) and MF 0.63 (app. 1, table 3, streets; safety factor 1.6, MF = 1/1.6): 13,000 × 0.35 × 0.63 / (30 × 7) ≈ 14 lx, above the 6 lx for category V and the 10 lx for a category B street with up to 500 vehicles/h. The spacing changes with the road width and the surface class.

What the replacement gives

Before: the same road on 27 high-pressure sodium (HPS) 250 W lamps at 275 W with ballast, ≈ 7.4 kW. At the nominal flux of new lamps (30,000 lm, Lisma DNaT 250-5M) that is ≈ 30 lx, and ≈ 27 lx by 16,000 hours (LLMF 0.85): 3 to 5 times the category V target. The old layouts were calculated from the lamp that was available, not from the target.

After: ≈ 2.7 kW at ≈ 14 lx with no end-of-life drop: the target is met, not exceeded several times over. At 11 burning hours for 365 days a year the difference is ≈ 19,000 kWh a year; in UZS, by the tariff on the date of the calculation (see the savings calculator).

A calculated estimate under the stated assumptions, not guaranteed until measured on site. Figures marked ≈ are estimates.

Frequently asked questions

What is the illuminance norm for streets and grounds?

ShNK 2.01.05-24 (table 15) sets the average road surface luminance or, as an alternative, the average horizontal illuminance: category B streets 0.6-1.0 cd/m² or 10-15 lx depending on traffic, category V service roads 0.3-0.4 cd/m² or 4-6 lx, factory forecourts 10 lx (table 16). Uniformity: Lmin/Lmax of at least 0.4 (item 93).

What IP rating and operating temperature does a street luminaire have?

Classic is a bracket-mounted luminaire rated IP65 (also made in IP54), with a catalogue temperature range of -30 to +50 °C. The extruded aluminium body works as a heat sink: the flux kept by the third summer depends on heat removal. The temperature is a data sheet value from the catalogue; the test report is still in progress.

How many luminaires does a kilometre of road need?

The spacing comes from E = F × UF × MF / (spacing × width), with MF 0.63 for streets (app. 1, table 3). In the typical layout, an on-site road of about 800 m, 7 m wide, with 8 m poles, is covered by about 27 Classic 100W luminaires at about 30 m spacing: about 2.7 kW and about 14 lx against the 6 lx norm for category V. That is an estimate: spacing depends on road width and surface, and DIALux gives the final figure.

What replaces a 250 W HPS lamp on a street?

Older layouts were designed from the lamp that was there, not from the norm. In the typical layout, a road on 27 HPS luminaires (about 7.4 kW) gives about 30 lx, 3-5 times the norm for category V. The same 27 poles with Classic 100W give about 14 lx at about 2.7 kW: the norm is met rather than exceeded several times over. The figures are estimates and are not guaranteed before measurement on site.

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