How to set lux targets zone by zone in a racked warehouse, why rack faces matter more than the floor, and how the energy calculation actually works when high bays meet sensors.
2026-09-10 · 9 min read · Lighting guide
A warehouse is the rare commercial space where the geometry of the goods dictates the lighting more than the architecture does. Rack uprights and beam levels cut the volume into narrow canyons, a forklift driver looks up as often as down, and a picker reads small labels at arm's reach. A design that treats the hall as an empty box and sprinkles high bays on a grid will hit its average lux number on paper and still fail on the rack faces, in the aisle shadows and on the energy bill. This guide walks the workflow that engineering buyers actually check: zone parameters first, layout second, controls third, documentation last.
Start with four facts about the building, because each one moves the design. First, rack height and aisle width: 8-12 m racking with 2.8-3.5 m aisles is the common regime for distribution centers, and it pushes fixtures toward aisle-optimized optics with a narrow, elongated distribution. Second, mounting height: clear height minus the truss or sprinkler zone; high bays typically hang 1-2 m below the roof steel, so a 12 m clear hall often means 10 m mounting. Third, material handling equipment: reach trucks with vertical masts put the operator's eye at 2-3 m, which makes overhead glare a safety issue, not just a comfort one. Fourth, duty cycle: a two-shift warehouse burns its lighting 4,000-5,000 hours a year, which is why sensor control pays back faster here than in almost any other application.
The design goals in priority order, as most operators state them: safe movement of machinery and people, label and barcode legibility for picking accuracy, vertical visibility of stored goods, and lowest possible kWh per square meter. Notice that "uniform brightness everywhere" is not on the list — a uniform 200 lx hall is usually the wrong answer and the expensive one.
EN 12464-1 practice attaches different targets to different tasks, and tender documents worldwide follow its structure. The table below reflects the values commonly used in distribution-center design; treat them as typical starting points and confirm against the current edition and any national annexes for your market.
| Zone | Maintained lux (typical) | CCT | CRI | Glare / uniformity |
|---|---|---|---|---|
| Open floor and bulk storage | 100-150 lx | 4000 K | 80 | UGR 25, Uo ≥ 0.40 |
| Racked aisles (drive-through picking) | 150-200 lx, verticals on rack faces 100-150 lx | 4000 K | 80 | Uo ≥ 0.40 along aisle axis |
| Manual picking, small items | 300 lx | 4000 K | 80 | UGR 22-25 |
| Packing and labeling benches | 500 lx | 4000 K | 80 | UGR 22, task-local fixtures |
| QC and inspection stations | 750 lx task-level | 4000-5000 K | 80-90 | UGR 19-22, adjustable |
| Loading docks and cross-dock | 150-300 lx | 4000-5000 K | 80 | UGR 25, night-transition aware |
| Battery charging, plant rooms | 150-200 lx | 4000 K | 80 | UGR 25 |
| Mezzanine offices in hall | 300-500 lx | 4000 K | 80 | UGR 19, separate circuit |
Values are illustrative of EN 12464-1 practice for goods storage and dispatch areas; verify against the current standard edition and project specification.
Two rows deserve comment. The rack-face vertical requirement is the one most often missed: pickers read shelf edges and carton labels on vertical planes, so the calculation must report vertical illuminance at the rack faces (commonly checked at 1.5 m and at the top beam level), not just horizontal lux on the floor. Aisle-optimized optics — asymmetric or double-asymmetric distributions with a narrow across-aisle beam — exist precisely to light those faces without wasting lumens on rack tops. Second, docks live a double life: bright enough to read paperwork in daylight, and a glare source for drivers backing in at night. Step-dimming at the door line solves both.
The energy math follows from the layout. In LED practice, a well-designed racked hall at 10 m mounting lands in the range of roughly 4-7 W/m² connected load for the storage zones (illustrative; the exact figure depends on the target lux, optics and maintenance factor). The worked example below shows the shape of the calculation buyers should expect from a serious supplier.
| Parameter | Legacy metal halide (illustrative) | LED retrofit, no sensors | LED + aisle sensors |
|---|---|---|---|
| Fixture count, 2,400 m² racked hall, 10 m MH | 36 × 400 W | 36 × 150 W | 36 × 150 W |
| Connected load | 14.4 kW | 5.4 kW | 5.4 kW |
| Annual burn hours (2 shifts) | 4,400 h | 4,400 h | 4,400 h |
| Effective on-hours per fixture | 4,400 h | 4,400 h | ~1,900 h (typical occupancy profile) |
| Annual energy | ~64,000 kWh | ~24,000 kWh | ~10,500 kWh |
Illustrative arithmetic for orientation only — actual savings depend on layout, occupancy profile and tariffs. Always re-run with project photometry.
Sensors are where the second (and larger) half of warehouse savings lives. The standard pattern is presence-based multi-level control per aisle: a fixture dims to 10-20% background when the aisle is empty and returns to 100% in seconds when a person or truck enters. Two implementations dominate. Onboard microwave sensors — one per fixture or one per pair — are the simplest to commission and the most common in retrofits. DALI-based systems group fixtures by aisle in software, give cleaner handover between fixtures and feed energy dashboards, which is why new-build projects with a BMS increasingly specify them. Beyond aisles, three further control points earn their cost: daylight harvesting at docks and under skylights (photocells trim output when the sun does the work), time-based corridor baselines for main traffic arteries that must stay lit, and automatic panic-off interlocks linked to the fire alarm where local code requires it. Do not forget the emergency circuit: EscapeRoute signage and anti-panic luminaires are a separate scope with its own standard, and retrofit projects that discover this at handover pay twice.
The deliverable list that separates a serious warehouse supplier from a catalog seller is short and checkable: photometric files (IES and LDT) for every SKU and wattage; a DIALux or Relux layout run on your actual rack and aisle geometry, reporting horizontal and vertical planes and uniformity; UGR tables where offices or packing benches are in scope; driver datasheets with flicker figures (PstLM ≤ 1.0 and SVM ≤ 0.4 are the EU-facing reference points); IP65/IP66 ratings for dusty or unheated zones; surge protection appropriate to the building's supply; and a written warranty that names what is covered and for how long. Certification by destination (CE, UKCA, SASO and others) is handled via certified partner factories and issued with verifiable documentation.
Illustrative commercial terms for orientation: samples of 1-5 pcs ship in 7-14 days with photometry included; trial orders run 100-200 pcs per SKU; bulk production 25-40 days after deposit; pricing is quoted per project. On the warehouse and industry lighting page you can see how the fixture families map to these zones; the wider industrial line covers factories and workshops, and smart lighting indexes the sensor and DALI options. Send the rack layout first — it changes the fixture choice more than any datasheet parameter.
Which fixture form fits your aisle geometry, mounting height and budget.
Spacing, mounting and lux calculation worked through for real halls.
The fixture family behind warehouse retrofits, from optics to drivers.
CE, UKCA, SASO and DLC by destination market — what your order actually requires.
DIALux layout with vertical-plane results and an FOB quotation — first response within 24 hours.