Car parks

What the facility needs

A car park means a low ceiling, round-the-clock operation and a target that looks modest until you look at uniformity. ShNK 2.01.05-24 sets 50 lx on the floor for parking bays in garages and car parks (app. 9, table 2, item 2b), 75 lx for the enclosed depots of transport companies (item 2a) and 6-20 lx for open car parks (table 21; app. 9, table 2, item 1). Specifications often ask for more on the driveways and ramps, and then we design to the specification. A dip between luminaires reads as a black hole, and at the entrance the eye moves from daylight into darkness: the transition zone is calculated separately.

The ceiling is usually 2.5 to 3.5 m: a point luminaire gives a pool of light beneath it and darkness in between, so the light is run in continuous lines along the driveway.

Why these series

Line is the basis of the solution: a continuous run along the driveway settles the uniformity question by geometry rather than by power. The Ultra 30×40 mm section does not steal headroom on a low ceiling.

Prom is needed on ramps and in zones with a ceiling above 4 m.

Typical layout

A car park of ≈ 3,000 m², ceiling height 3 m, two driveways:

• SVO 01 Line Ultra 40W in continuous runs along the driveways, ≈ 180 pcs
• installed load ≈ 7.2 kW
• at the entrance and on the ramp the run is doubled up

Flux from the 2018 IES file: Line Ultra 40W 5,600 lm. Utilisation factor method with UF 0.5 (low ceiling, dark surfaces, cars) and MF 0.67 (safety factor 1.5, MF = 1/1.5): 180 × 5,600 × 0.5 × 0.67 / 3,000 ≈ 110 lx, twice the 50 lx target. The target alone would be met by ≈ 80 pcs (≈ 3.2 kW), but continuous runs along the driveways deliver uniformity by geometry; how many to install is decided by the specification and the DIALux calculation.

What the replacement gives

Before: the same car park on 200 fluorescent 2×36 W fittings at 90 W with magnetic ballasts, ≈ 18 kW. At the nominal lamp flux (6,700 lm) the same assumptions give ≈ 150 lx, and ≈ 100 lx with a louvred fitting efficiency of about 0.65.

After: ≈ 7.2 kW at ≈ 110 lx. The light burns round the clock, 8,760 hours a year, so the difference is ≈ 94,600 kWh a year; with 80 luminaires for the bare target, ≈ 129,600 kWh. 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.

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