Warehouse Lighting Lux Level Requirements — Complete Standard Guide (2026)

Published: July 13, 2026 | Author: Simon Chen, Senior LED Supply Chain Expert | Category: LED Technology

Key Takeaways

• 100-150 lux for aisles, 200-300 lux for packing, 500+ lux for inspection. Per EN 12464-1:2021 and IESNA RP-20. These are maintained illuminance values, not initial install readings. A fixture that measures 300 lux on day one will be 210-240 lux after 3 years of dust accumulation and LED depreciation if the maintenance factor wasn't built in.
• Uniformity (U0) matters as much as average lux. A warehouse aisle that averages 150 lux but has spots at 40 lux between fixtures creates safety hazards and worker fatigue. EN 12464-1 requires U0 >= 0.4 for storage zones and >= 0.7 for inspection areas.
• Ceiling height directly determines the lumen output needed per fixture. A fixture that delivers 200 lux at 20 ft will deliver roughly 100 lux at 30 ft with the same beam angle. You can't just buy more fixtures of the same wattage and mount them higher. The spacing criterion in the IES file tells you the real story.
• LED maintains lux levels far longer than metal halide. At 50,000 hours, a quality LED still delivers >90% of initial lumens (L90). Metal halide at the same age has dropped to 60-70% and needs relamping. The lux on your warehouse floor after year 5 is what your workers experience every shift. Spec for maintained, not initial.
• If your supplier can't provide an IES file, LM-79 report, and TM-21 projection, their lux claims are unverifiable. Three documents. No exceptions for industrial procurement.

Key Definitions

Lux (lx)

The SI unit of illuminance. One lux equals one lumen per square meter. It measures how much light actually lands on a surface: not how much the fixture produces, but how much reaches the workplane. In North American specifications, you'll also see footcandles (fc): 1 fc = 10.764 lux. A warehouse aisle at 150 lux is roughly 14 footcandles.

Lumen (lm)

The SI unit of luminous flux: the total amount of visible light a source emits in all directions. A 200W LED high bay producing 30,000 lumens is the source output. The lux reading at the floor depends on mounting height, beam angle, and room reflections. Don't confuse lumens (what the fixture makes) with lux (what reaches the surface).

Illuminance (E)

The luminous flux per unit area incident on a surface. Measured in lux. Maintained illuminance (Em) is the value below which the illuminance must not fall throughout the maintenance cycle: it accounts for dirt accumulation, lamp lumen depreciation, and room surface deterioration. Initial illuminance is what you measure the day the lights are installed. Maintained is what you design for.

Uniformity (U0)

The ratio of minimum illuminance to average illuminance across a defined area (Emin / Eavg). U0 = 0.4 means the darkest point in the zone has at least 40% of the average lux. EN 12464-1 sets U0 >= 0.4 for warehouse storage and circulation areas, and U0 >= 0.7 for inspection and detailed work stations. Low uniformity means pools of bright light and dark shadows: this is what creates the "cavern effect" in poorly lit warehouses.

Unified Glare Rating (UGR)

A measure of discomfort glare from luminaires, calculated per CIE 117-1995 on a scale from 10 (imperceptible) to 31 (intolerable). EN 12464-1 sets UGR <= 25 for general warehouse areas and UGR <= 19 for inspection stations. High UGR is a real productivity killer: forklift operators looking up into a bright fixture at a 45-degree angle will experience discomfort and reduced visibility, and they won't necessarily tell you about it until an incident happens.

Color Rendering Index (CRI / Ra)

A scale from 0 to 100 measuring how accurately a light source renders colors compared to a reference illuminant. CRI 70 is the minimum for basic warehouse storage (EN 12464-1). CRI 80 is required for packing and sorting where label colors matter. CRI 90+ is required for quality inspection stations. Don't forget R9 (deep red rendering): a fixture can score CRI 80 while rendering reds at R9 = -20, making red warning labels and safety markings look brown or grey.

Correlated Color Temperature (CCT)

The apparent color of the light source, measured in Kelvin (K). 3000K is warm white, 4000K is neutral white, 5000K is cool white. For warehouses, 4000K is the standard: it provides the best balance of visual acuity and worker comfort over 8-12 hour shifts. 5000K is acceptable for high-alertness zones like shipping and receiving docks. Avoid 3000K in warehouses; it reduces contrast perception and makes reading labels and barcodes harder.

Lux Requirements by Warehouse Zone

Different zones inside the same warehouse have different lux requirements. A single specification of "200 lux throughout" is wasteful in aisles and inadequate in inspection. The table below pulls the exact numbers from EN 12464-1:2021 and IESNA RP-20-14 so you can write zone-specific specs in your RFQ.

Warehouse Zone	Typical Activity	EN 12464-1:2021 (lux, maintained)	IESNA RP-20-14 (lux)	CRI Minimum (Ra)	UGR Maximum	U0 Minimum
Bulk Storage: Inactive	Rare pedestrian access, long-term pallet storage, no regular picking	100	50-100	70	28	0.4
Aisles: General Storage	Forklift traffic, pallet retrieval, occasional manual picking	150	100-150	70	25	0.4
Loading Bays & Receiving	Unloading trucks, pallet handling, initial goods check-in	200	150-200	80	25	0.4
Packing & Sorting	Order picking, label reading, barcode scanning, packaging	300	200-300	80	22	0.6
Assembly & Light Manufacturing	Product assembly, kitting, light mechanical work	300-500	300-500	80	22	0.6
Quality Inspection & QA	Detailed visual inspection, color matching, defect detection	500-750	500-1000	90	19	0.7
Offices & Control Rooms	Desk work, monitor use, paperwork, shift handover	300-500	300-500	80	19	0.6
Circulation Areas & Corridors	Pedestrian walkways, emergency egress routes, break areas	100-150	100	70	28	0.4

A note on North American specs: IESNA values are often quoted in footcandles in older US project specifications. 10 footcandles = approximately 108 lux. If you're working on a US warehouse retrofit and the facility manager says "we need 20 footcandles," that's roughly 215 lux. Multiply footcandles by 10.76 to convert. And always confirm whether the spec references initial or maintained values: this is the single most common source of disputes between lighting suppliers and warehouse operators after installation.

Why Lux Requirements Vary by Task Type: It's About What the Eye Needs to See

A forklift driver navigating a 12-foot-wide aisle doesn't need the same lux as a QC inspector examining solder joints under a magnifying lamp. The lux requirement scales with three factors: the size of the detail being viewed, the contrast between the object and its background, and the speed at which the task is performed.

In a bulk storage aisle, the driver's task is spatial navigation and pallet label reading at a distance. The visual target (a pallet, a rack beam, another forklift) is large, high-contrast, and the driver has seconds to process it. 100-150 lux is adequate. Push it to 300 lux in an aisle and you're not improving safety: you're just paying for electricity and potentially increasing glare.

In a packing station, the worker is reading 8-point font on shipping labels, scanning barcodes at 12-18 inches, and matching order sheets to products. The visual targets are small, sometimes low-contrast (grey barcode on brown cardboard), and the task is performed continuously for hours. That's why EN 12464-1 calls for 300 lux maintained with CRI 80 minimum. The CRI requirement isn't optional here: if the fixture renders reds poorly (low R9), the worker's error rate on color-coded picking labels goes up measurably.

At the inspection station, the task involves detecting surface defects smaller than 0.5mm, verifying color accuracy against a reference sample, and reading micro-print on component labels. The visual target is tiny, the contrast can be extremely low (a hairline crack on a dark surface), and the consequence of missing it (a defective batch shipped to a customer) is expensive. This is why 500-750 lux with CRI 90 and U0 >= 0.7 isn't a luxury: it's the minimum for the human visual system to perform the task reliably over an 8-hour shift.

I've seen procurement teams try to save money by specifying 300 lux throughout the entire warehouse: one fixture type, one spacing grid, one spec. It works for about two months. Then the inspection team starts bringing in desk lamps. Then the packing error rate ticks up. Then someone realizes that the "savings" on the lighting budget got eaten by the cost of three returned shipments. Zone your lighting. It costs more to design but less to operate.

How to Measure Lux on Site: The Grid Method That Holds Up in a Dispute

You can't verify your supplier's lux claims without a measurement protocol that both sides agree on. The grid method from CIBSE SLL Code for Lighting is the international standard, and it's what any third-party commissioning agent will use. Here's the procedure, step by step, with the warehouse-specific modifications that most generic guides miss.

Step 1: Define the measurement grid. Divide the zone into equal squares. For aisles, use a 2m x 2m grid. For packing and inspection zones, use a 1m x 1m grid. The measurement points are at the center of each grid square, at 0.75m above the finished floor (the standard workplane height). Mark them with masking tape if needed: you'll want to repeat measurements at the same points for before-and-after comparisons.

Step 2: Prepare the space. Let the LED fixtures warm up for a minimum of 30 minutes before taking any readings. LED output stabilizes after about 20-30 minutes of operation; measuring during warm-up gives falsely low readings. If the warehouse has skylights or windows, measure at night or cover them. Daylight contribution will inflate your readings by 50-200 lux and make the artificial lighting look better than it is. Close all dock doors.

Step 3: Use a calibrated lux meter. Class B per CIE Publication 69, calibrated within 12 months, with cosine correction. Point the sensor straight up (horizontal illuminance measurement). Hold it at arm's length or use a tripod: your body blocks light and a standing person can reduce the reading at the sensor by 10-15%. For vertical illuminance on rack faces (critical for label readability), rotate the sensor 90 degrees and measure at 1.5m and 3.0m heights on the rack face at each grid point in the aisle.

Step 4: Record and calculate. Record all grid point readings. Calculate Eavg (sum of all readings divided by number of points), Emin (the lowest individual reading), and U0 (Emin / Eavg). If U0 falls below the standard for that zone, the layout needs adjustment: usually tighter fixture spacing or wider beam angles: even if Eavg passes. A zone with Eavg = 300 lux but Emin = 60 lux (U0 = 0.2) fails every standard and will generate worker complaints.

Step 5: Document for the record. Take photos of the lux meter display at the Emin point, the Eavg point, and the Emax point. Date-stamp them. Note which fixtures were operating and which were not. If the warehouse isn't fully stocked with racking and inventory during measurement, document that: empty racking reflects light differently than racks full of product, and your lux readings will shift once the warehouse is at capacity.

The Uniformity Factor: Why Average Lux Alone Is a Useless Metric

Here's a scenario I've seen play out in supplier disputes more times than I can count. The lighting contractor installs fixtures, measures 200 lux average across the warehouse floor, and declares the job done. Three weeks later, the warehouse manager calls: "Half my pickers are complaining they can't see what they're doing in aisles 4 through 7." The contractor comes back, re-measures, and finds that while the average is 200 lux, the minimum between fixtures in those aisles is 35 lux. U0 = 0.175. The average passed. The uniformity failed. And the warehouse has a real problem.

Uniformity (U0 = Emin / Eavg) is the metric that tells you whether the light is evenly distributed or pooled in bright spots separated by dark zones. EN 12464-1:2021 sets three thresholds relevant to warehouses:

• U0 >= 0.4 for storage areas, aisles, and circulation zones. At U0 = 0.4 with Eavg = 150 lux, the darkest point is at least 60 lux. That's workable for navigation and simple tasks.
• U0 >= 0.6 for packing, sorting, and assembly areas. The task demands more consistent light.
• U0 >= 0.7 for inspection and QA stations. At 500 lux average, the minimum point must be at least 350 lux. If it's not, the inspector is working in a relative shadow.

What determines uniformity? Fixture spacing relative to mounting height, beam angle, and the photometric distribution pattern of the luminaire. A narrow-beam high bay (60 degree) spaced at 1.5x the mounting height will have terrible uniformity: bright spots directly under each fixture, dark bands between them. A wide-beam fixture (120 degree) at the same spacing will have much better U0 because the beam patterns overlap. The spacing criterion in the IES file encodes this relationship mathematically. If your supplier can't tell you what U0 their proposed layout achieves at your specific ceiling height and fixture spacing, they haven't actually designed the lighting: they've just counted fixtures.

Ceiling Height and Lux: Higher Means More Lumens, Not Just More Fixtures

The relationship between ceiling height and the lumens needed for a target lux level follows the inverse square law but with real-world complications from beam angle and room surface reflections. Here's the practical procurement version, not the physics textbook version.

At 15-20 ft ceilings, you can achieve 200 lux with fixtures in the 12,000-18,000 lumen range at roughly 15-20 ft spacing. This is low-bay territory, and the light has a short enough throw that beam angle matters less: even a 90-degree beam covers well at this height.

At 25-30 ft, the same 200 lux target needs 25,000-35,000 lumens per fixture, and beam angle becomes critical. A 90-degree beam at 30 ft produces a roughly 47 ft diameter pool on the floor. A 60-degree beam at 30 ft produces only a 35 ft pool. You'll need more fixtures with the narrower beam, but each one puts more light where you aim it. For open-plan warehouses at 25-30 ft, 90-120 degree UFO high bays are the sweet spot. For narrow aisles at the same height, linear high bays with 60-90 degree asymmetric optics mounted parallel to the racks win on both lux and uniformity.

At 35-40 ft, achieving 200 lux demands 40,000-50,000+ lumen fixtures with careful spacing. The beam spread is now 55-63 ft diameter at 120 degrees. You'll cover more floor per fixture but need massive lumen output per fixture. The spacing criterion becomes your most important spec: get it wrong at 40 ft and the dark spots are 15-20 ft wide, not fixable by simply adding more light elsewhere.

The mistake I see repeatedly: a buyer specs 200 lux for a 35 ft warehouse, the supplier quotes 30,000 lumen fixtures based on a 25 ft ceiling assumption, the fixtures get installed, and the measured lux is 120, not 200. The supplier blames the ceiling height ("you didn't tell us it was 35 ft"), the buyer blames the supplier ("you should have asked"), and everyone loses six weeks in disputes. Specify ceiling height in the RFQ. In feet or meters, doesn't matter which: just put the number in writing.

LED vs Metal Halide: Lux Over Time Is the Real Story

If you're retrofitting a warehouse from metal halide to LED, the lux comparison isn't just about what each technology produces on day one. It's about what each technology produces on day 1,000: which is when your workers actually experience the lighting.

Metric	LED High Bay (Quality, 150 lm/W+)	Metal Halide (400W, New)	What It Means for Lux
Initial lumens	30,000 lm (200W fixture)	32,000-36,000 lm (400W lamp + ballast losses)	Metal halide starts slightly ahead on raw lumens for equivalent wattage
Lumen maintenance at 10,000 hrs (~2.3 yrs at 12h/day)	97% (L97): 29,100 lm remaining	75-80%: 25,600 lm remaining	LED is already 14% brighter at the workplane after 2 years
Lumen maintenance at 20,000 hrs (~4.6 yrs)	94% (L94): 28,200 lm remaining	60-70%: typically relamped by this point	Metal halide needs a $40-80 lamp replacement and labor. LED keeps going.
Lumen maintenance at 50,000 hrs (~11.4 yrs)	>90% (L90): 27,000+ lm remaining	N/A: fixture has been relamped 2-3 times, ballast likely replaced once	LED still providing usable light. Metal halide has cost $150-300 in maintenance per fixture by this point.
Lux degradation per year (approximate)	~1% per year	~8-12% per year	Design your LED layout for the maintained lux, not the initial. With metal halide, you had to over-light by 30-40% on day one to hit the target at year 2.

The procurement implication: when a supplier offers you a choice between "400W metal halide equivalent LED" at 150W, don't compare the initial lumens. Compare the maintained lumens at the maintenance interval you actually plan to use. A metal halide fixture might output 34,000 lumens new but only 24,000 after 8,000 hours (under 2 years at 12 hours/day). The LED might output 22,500 lumens new but 21,800 after 8,000 hours. On day one, the metal halide is 50% brighter. On day 500, the LED is pulling ahead. On day 1,000, the LED is clearly superior and the metal halide is due for a lamp change. Design for maintained, not initial.

Lux for Special Zones: Cold Storage, Hazardous Areas, and Clean Rooms

Standard warehouse lux tables assume ambient temperatures of 15-35 degrees C, normal atmospheric conditions, and non-critical contamination environments. When those assumptions break, the lux spec changes too.

Cold Storage (-25 degrees C to 0 degrees C)

Freezer warehouses have two lux complications that room-temperature specs don't cover. First, LED efficacy drops at low temperatures: a fixture rated 30,000 lumens at 25 degrees C might output 27,000 at -20 degrees C, about a 10% reduction. Second, ice fog and frost accumulation on fixture lenses reduce light output over time, and unlike dust in a dry warehouse, you can't just wipe it off without a defrost cycle. For cold storage, EN 12464-1 recommends the same 100-150 lux for aisles as ambient warehouses, but procurement practice says to add a 20-25% buffer to your fixture spec to account for cold-temperature efficacy loss and lens frosting between defrost cycles. Also: spec fixtures with silicone gaskets (not EPDM) and IP66 minimum. The thermal cycling when rack doors open to ambient air creates pressure differentials that pull moisture into IP65 housings.

Hazardous Areas (Zone 1 / Zone 2, Class I Div 2)

In warehouses storing flammable solvents, grain dust, or chemical intermediates, the lux spec takes a back seat to the explosion-proof rating. ATEX/IECEx certification for the fixture housing is the primary procurement requirement, and it constrains your lumen output options: explosion-proof housings are thicker, heavier, and typically have lower optical efficiency (60-75% vs 85-90% for standard industrial fixtures). The lux requirement itself doesn't change (150 lux for aisles per EN 12464-1 still applies), but achieving it costs 30-50% more per delivered lumen because of the housing constraints. Budget for roughly 1.5x the fixture count of an equivalent non-hazardous warehouse. For grain storage specifically, add the additional requirement that the fixture surface temperature must stay below the dust ignition temperature: this forces lower wattage per fixture and tighter spacing, which paradoxically improves uniformity.

Clean Rooms (ISO Class 5-8)

Clean room lighting for pharmaceutical and electronics warehouses adds two constraints. The fixture housing must be flush-mounted or fully sealed to prevent particle accumulation on horizontal surfaces, and the lens material must resist hydrogen peroxide vapor (VHP) sterilization without yellowing. Lux requirements follow EN 12464-1's manufacturing tables: 300-500 lux for general clean room work, 500-750 for precision assembly. The practical challenge is that flush-mounting limits heat dissipation, which constrains how many lumens you can pack into a single fixture. Expect to need 20-30% more fixtures than a standard warehouse of the same square footage. The good news: clean rooms have low ceilings (typically 8-12 ft), so the lumens-per-square-foot requirement is lower than for a 30 ft distribution center.

How to Verify Supplier Lux Claims: Three Documents That Separate Real Data from Marketing

Every LED lighting supplier will tell you their fixtures meet "warehouse lux standards." Most of them can't prove it. Here's what separates a supplier with real photometric engineering from one with a catalog and a confident sales team.

Document 1: The IES photometric file (LM-63 format). This is the digital fingerprint of the fixture's light distribution. It's a text file containing luminous intensity values at thousands of angles, and it's what lighting design software (DIALux, AGi32, Relux) uses to simulate exactly how much light reaches every point on your warehouse floor. Request the IES file for the exact fixture model, wattage, and CCT being quoted. Open it in the free DIALux evo software, model your warehouse with your actual racking layout and ceiling height, and run the calculation. If the simulated maintained lux doesn't match the supplier's claim within 10%, ask why. The answer is usually that the supplier used a different maintenance factor, different reflectance values, or an idealized layout without racking. Those are all legitimate variables: but they need to be disclosed and agreed on before the order is placed.

Document 2: LM-79 test report from an ISO 17025 accredited laboratory. LM-79 is the standard for testing total luminous flux, electrical power, efficacy, CRI, and CCT of a complete LED luminaire. The report should be for the exact model and CCT being quoted: not a "similar" model or a "representative sample" from six months ago. Check the report date. Check the lab's accreditation status on the lab's website (not just the logo on the report: anyone can paste a logo). The key numbers: total lumens, system wattage (including driver losses), efficacy (lm/W), CRI (Ra), R9 value, CCT, and chromaticity coordinates (to verify the CCT claim is real: a "5000K" fixture that measures at 6200K is mislabeled).

Document 3: LM-80 report and TM-21 projection. LM-80 tests the LED package's lumen maintenance over at least 6,000 hours at multiple temperatures. TM-21 takes that data and projects it forward to estimate the L70, L80, or L90 lifetime. For a warehouse running 16-24 hours/day, you want the TM-21 projection at the fixture's actual Tc (case temperature), which depends on the thermal design of the housing. A LED package that achieves L90 > 50,000 hours in the LM-80 test at 55 degrees C might only achieve L90 > 36,000 hours at 85 degrees C. The fixture's thermal design determines which temperature the LEDs actually run at. A supplier who provides only the LM-80 report without the TM-21 projection at the fixture's operating temperature is showing you half the story.

At Kingseng, every industrial fixture ships with its IES file available for download. LM-79 and TM-21 reports are provided within 48 hours of request for any active production model. Our Shenzhen factory maintains an integrating sphere and goniophotometer in-house for rapid verification, and annual third-party LM-79 testing at an ISO 17025 lab confirms the in-house measurements.

What Happens When the Lux Doesn't Match the Spec: A Real Factory Audit Story

A few years ago, we were brought in to audit a lighting installation at a 60,000 sq ft distribution center in Southeast Asia. The supplier: not Kingseng: had quoted 200 lux maintained across the picking and packing zones, with IES files and a DIALux simulation that looked perfect on paper. The fixtures were installed. The warehouse manager called us two weeks later. "Half my pickers are using headlamps."

We flew out with a calibrated lux meter. The grid measurements told the story. The aisles averaged 112 lux, not 200. The packing stations averaged 135 lux. The uniformity in the picking aisles was U0 = 0.22: less than half the EN 12464-1 minimum of 0.4. What happened? The supplier had run the DIALux simulation with an empty warehouse: no racking, no inventory. The actual warehouse had 25-foot racking on 8-foot aisles. The racking was absorbing and blocking 30-40% of the light that the simulation assumed would reach the floor.

The fix cost the warehouse operator an additional $47,000: new fixtures with tighter spacing in the picking aisles, supplemental linear high bays on the rack faces for vertical illuminance, and three weeks of downtime for reinstallation. The original supplier's response: "Our simulation was correct for the empty space. You should have told us about the racking." The contract didn't specify that the simulation must include racking. The buyer ate the cost.

Three lessons from this one. First, your RFQ must state: "DIALux or AGi32 simulation shall include the as-built racking layout with racking heights and aisle widths." Second, specify that the simulation report must show maintained illuminance with the actual maintenance factor, not initial illuminance. Third, the acceptance criteria in the contract need to reference measured maintained illuminance at the workplane after installation with racking in place, not simulated values from an empty-floor model. A single sentence in the RFQ: "lighting simulation shall model the complete racking layout as shown in Drawing WH-2024-03": would have saved $47,000.

Standards & References

All lux values and requirements in this guide are sourced from the following international standards. Always reference the specific standard and clause in your procurement documents: "meets international standards" isn't specific enough for a binding specification.

• EN 12464-1:2021: Light and lighting. Lighting of work places. Part 1: Indoor work places. European Committee for Standardization (CEN). This is the primary reference for warehouse lux, uniformity, UGR, and CRI requirements in EU and many international projects.
• IESNA RP-20-14: Recommended Practice for Lighting Industrial Facilities. Illuminating Engineering Society of North America. The North American equivalent, with zone-specific lux recommendations for warehouses, distribution centers, and manufacturing floors.
• ISO 8995-1:2002 (CIE S 008/E:2001): Lighting of work places. Part 1: Indoor. Joint ISO/CIE standard that harmonizes with EN 12464-1 for international projects.
• AS/NZS 1680.2.4:2017: Interior and workplace lighting. Part 2.4: Industrial tasks and processes. Standards Australia/Standards New Zealand. Relevant for Asia-Pacific warehouse projects.
• CIBSE SLL Code for Lighting (2022): The Society of Light and Lighting's comprehensive code, published by the Chartered Institution of Building Services Engineers. Contains the grid measurement methodology referenced in this guide's on-site measurement section.
• IES LM-79-19: Approved Method: Optical and Electrical Measurements of Solid-State Lighting Products. The standard test method for total luminous flux, efficacy, and color characteristics of LED luminaires.
• IES LM-80-20: Approved Method: Measuring Luminous Flux and Color Maintenance of LED Packages, Arrays and Modules. The standard for lumen maintenance testing referenced in TM-21 lifetime projections.
• IES TM-21-21: Technical Memorandum: Projecting Long-Term Luminous Flux Maintenance of LED Light Sources. The method for projecting LM-80 data into L70/L80/L90 lifetime estimates.

Frequently Asked Questions

Warehouse Lux Audit Checklist for Buyers

Print this. Take it to your next supplier meeting or site walkthrough. Every unchecked box is a risk that'll surface after installation.

1. Zone-by-zone lux specification written into the RFQ. Not "200 lux throughout." Each zone (aisles, packing, inspection, loading bays, offices) has its own target maintained lux, CRI, UGR, and U0 values per EN 12464-1 or IESNA RP-20. Check ___
2. Ceiling height confirmed and documented. Measured, not estimated from drawings. If the warehouse has varying ceiling heights (mezzanines, dock areas, stepped roofs), each height zone is specified separately. Check ___
3. IES photometric files received for every fixture model quoted. File names match the exact model numbers on the quotation. Files open correctly in DIALux or AGi32. Check ___
4. DIALux/AGi32 simulation completed with racking layout included. The simulation report shows maintained illuminance with the agreed maintenance factor, not initial illuminance. Racking heights, aisle widths, and reflectance values are documented. Check ___
5. LM-79 test reports provided for each fixture model and CCT. Reports are from an ISO 17025 accredited lab, dated within 2 years, and show total lumens, system wattage, efficacy, CRI (Ra), R9, CCT, and chromaticity coordinates. Check ___
6. LM-80 report and TM-21 projection provided. The TM-21 projection is calculated at the fixture's actual operating case temperature (Tc), not the LED package test temperature. L90 or L70 lifetime meets the project's maintenance interval requirement. Check ___
7. Uniformity (U0) targets specified for each zone. U0 >= 0.4 for storage/aisles, >= 0.6 for packing/assembly, >= 0.7 for inspection. The simulation report shows calculated U0 for each zone. Check ___
8. UGR limits specified and simulated. UGR <= 25 for general warehouse, <= 22 for packing, <= 19 for inspection and offices. The simulation report includes UGR calculations at key observer positions (forklift driver eyeline, packing station operator position). Check ___
9. Acceptance testing protocol agreed before installation. The contract specifies: grid measurement method (CIBSE SLL), lux meter class (Class B minimum), measurement timing (30+ minutes after fixture warm-up, no daylight contribution), workplane height (0.75m), and pass/fail criteria (maintained lux and U0 for each zone). Check ___
10. Maintenance factor and cleaning schedule documented. The agreed maintenance factor (typically 0.7-0.8 for warehouses) is stated in the simulation. The cleaning schedule for fixtures and the relamping/replacement policy are written into the O&M manual. Check ___
11. Special zone requirements addressed. Cold storage: 20-25% lumen buffer for low-temperature efficacy loss and lens frosting. Hazardous areas: ATEX/IECEx certification confirmed, fixture count adjusted for lower optical efficiency of explosion-proof housings. Clean rooms: flush-mount compatibility and VHP resistance confirmed. Check ___
12. Vertical illuminance measurements included in the spec. For aisles with racking above 10 ft, vertical lux measurements at 1.5m and 3.0m on rack faces are required. This is the most commonly forgotten measurement and the #1 source of post-installation complaints about "can't read the labels." Check ___

This guide is part of the Kingseng technical documentation series. Kingseng (ksimpexp.com) is a China-based, lighting-focused B2B sourcing partner operating from a 2,500 sqm factory in Shenzhen Longgang with 500,000+ unit annual capacity. Our industrial LED high bay and linear fixtures serve warehouse, cold storage, and manufacturing clients across 40+ countries. For IES files, LM-79 reports, or a DIALux simulation for your specific warehouse layout, contact our engineering team at ksimpexp.com/contact-us.

Related: Best LED High Bay Lights 2026 | What is IP Rating for LED Lighting | What is CRI in Lighting | LED Installation Cost Guide

---