Warehouse Lighting Calculator

Warehouse and Industrial Lighting Calculator — Free Tool

Enter 0 if no racking or shelving

Your Layout Results

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Fixtures Needed
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Fixture Spacing
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Wall Offset
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Est. Footcandles
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Rows
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Columns
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What This Warehouse Lighting Calculator Does

This free tool helps facility managers, operations teams, and electrical contractors estimate the number of high bay or low bay LED fixtures needed to properly illuminate a warehouse, distribution center, or industrial facility. Enter your floor dimensions, ceiling height, racking height, and activity zone, and the calculator applies IESNA footcandle standards and a ceiling-height-adjusted coefficient of utilization to return a fixture count, spacing, wall offset, and compliance check against OSHA minimums.

Unlike generic lighting calculators that apply office-grade CU values to industrial spaces, this calculator uses a lower CU for high-ceiling environments (0.55 for ceilings above 25 ft, 0.60 for 20 to 25 ft, 0.65 for under 20 ft) to reflect the real-world light loss that occurs in tall industrial spaces. It also accounts for racking height as an input, which reduces effective mounting height and tightens the required fixture spacing in facilities with tall racking systems.

For office spaces, retail floors, and healthcare facilities using recessed downlights or troffers, see our Recessed Lighting Calculator.

How to Use the Warehouse Lighting Calculator

  1. Enter Your Floor Dimensions and Ceiling Height

    Measure the length and width of the facility in feet. Enter the ceiling height at its lowest point -- this drives the fixture type recommendation and adjusts the CU value used in the calculation. For facilities with varying ceiling heights, run the calculator separately for each zone.

  2. Enter Racking Height (If Applicable)

    If your facility has pallet racking or shelving, enter the height of the tallest rack in feet. This reduces the effective mounting height for the calculation -- a 30 ft ceiling with 20 ft racking leaves only 10 ft of useful light throw above the work surface. Enter 0 if the facility has no racking.

  3. Select Your Activity Zone

    Choose the zone type that best matches your operation. The calculator uses this to set the target footcandle level per IESNA and OSHA standards. Active order picking areas require 30 fc. Fine inspection or assembly work requires 50 to 100 fc. General bulk storage can be as low as 10 fc.

  4. Select Your Fixture Type

    Choose from common high bay or low bay LED fixture options. The calculator auto-recommends a fixture type based on your ceiling height, but you can override it. If you have a specific fixture spec, select it and adjust the lumen value to match your product.

  5. Review Your Results

    The calculator returns fixture count, recommended spacing, wall offset, estimated delivered footcandles, and a rows by columns grid layout. It also checks your result against the OSHA minimum for your zone type and flags whether the layout meets, exceeds, or falls short of compliance.

Warehouse and Industrial Footcandle Standards

Footcandle targets below are based on IESNA (IES Lighting Handbook), OSHA 1910.303, and industry practice for warehouse and industrial facilities. OSHA 1910.303 sets minimum levels for general illumination in commercial and industrial spaces. IESNA provides more detailed activity-specific recommendations.

Activity ZoneOSHA MinimumIESNA RecommendedNotes
Inactive Storage5 fc5-10 fcBulk storage, rarely accessed areas
General Storage5 fc10-20 fcStandard warehouse operations
Active Order Picking10 fc30 fcPicking, packing, and sorting operations
Loading Dock / Receiving10 fc20-30 fcVehicle access zones and receiving areas
General Manufacturing10 fc30-50 fcAssembly, fabrication, general production
Medium Detail Manufacturing20 fc50 fcMachining, medium-detail assembly
Fine Detail / Inspection50 fc100+ fcQuality control, fine assembly, inspection lines
Distribution Center (general)10 fc30 fcMixed storage and movement operations
Cold Storage / Freezer5 fc10-20 fcWet-rated or vapor-tight fixtures required

High Bay vs Low Bay: Which Fixture is Right for Your Space

The dividing line between high bay and low bay lighting is generally 20 feet of ceiling height. Below that, low bay fixtures deliver better uniformity and efficiency. Above it, high bay fixtures are designed to throw light the distance needed to reach the work surface without excessive loss.

Fixture TypeCeiling Height RangeTypical Lumen OutputCommon Applications
Low-Bay LED Round10 to 20 ft6,000 to 10,000 lmSmall warehouses, maintenance shops, light manufacturing
Low-Bay LED Linear12 to 20 ft10,000 to 16,000 lmAssembly areas, smaller distribution facilities
High-Bay LED UFO 100W20 to 25 ft12,000 to 14,000 lmMid-height warehouses, standard distribution centers
High-Bay LED UFO 150W20 to 30 ft18,000 to 22,000 lmTall warehouses, order fulfillment centers
High-Bay LED UFO 200W25 to 35 ft24,000 to 28,000 lmHigh-ceiling manufacturing, bulk storage facilities
High-Bay LED UFO 300W30 to 45 ft38,000 to 42,000 lmVery high-ceiling industrial, large manufacturing plants
High-Bay LED Linear 400W35 to 50 ft50,000 to 60,000 lmExtreme-height industrial, aerospace, heavy manufacturing

Worked Example: 200x100 ft Distribution Center

A worked example using the formula this calculator applies -- a 200x100 ft active order picking area with 28 ft ceilings, no racking, and 200W high-bay UFO fixtures.

Inputs

  • Floor: 200 ft x 100 ft = 20,000 sq ft
  • Ceiling Height: 28 ft
  • Racking Height: 0 ft (open floor)
  • Activity Zone: Active Order Picking (30 fc target)
  • Fixture: High-Bay LED UFO 200W at 26,000 lm
  • CU: 0.55 (high-ceiling warehouse, ceiling above 25 ft)
  • LLF: 0.85 (LED fixture aging and dust)

Calculation

Total Lumens Required = Area x Target fc / (CU x LLF) = 20,000 x 30 / (0.55 x 0.85) = 600,000 / 0.4675 = 1,283,422 lumens required Number of Fixtures = 1,283,422 / 26,000 lm = ~50 fixtures Effective Mtg Height = 28 ft ceiling - 0 ft racking = 28 ft Fixture Spacing = 28 ft x 1.3 (high-ceiling SHR) = ~14 ft Wall Offset = Spacing / 2 = 14 / 2 = 7 ft

Frequently Asked Questions

The number depends on four variables: floor area, ceiling height, target footcandles for your activity, and lumen output of your chosen fixture. A 20,000 sq ft warehouse at 30 ft ceilings targeting 30 footcandles with 200W fixtures (26,000 lm) typically needs around 50 fixtures. Use the calculator above for your specific dimensions and activity zone. As a general rule, round up on fixture count -- dark spots in a warehouse create safety hazards and a few extra fixtures are inexpensive insurance.
OSHA 1910.303 sets a general minimum of 5 footcandles for storage areas and 10 fc for work areas, but IESNA recommends higher levels for most operations: 10 to 20 fc for general storage, 30 fc for active picking and distribution, and 50 to 100 fc for manufacturing and inspection. Facilities with forklifts, conveyor systems, or barcode scanning benefit from the higher end of these ranges for both safety and operational accuracy. The activity zone dropdown in this calculator sets the appropriate target for your operation type.
The spacing-to-height ratio (SHR) is the distance between fixtures divided by the mounting height above the work surface. For most LED high bay fixtures, the ideal SHR falls between 1.0 and 1.5. At a ratio above 1.5, you begin to see uneven coverage with dark patches between fixtures. This calculator uses an SHR of 1.3 for high-ceiling spaces (above 20 ft) and 0.6 times the ceiling height for lower ceilings, which is consistent with IESNA guidelines for most warehouse fixture types.
Tall racking reduces the effective distance between the fixture and the work surface. A 30 ft ceiling with 20 ft racking only gives 10 ft of light throw to reach the top of the racking and illuminate the picking aisles. This shorter throw distance means tighter spacing is needed to maintain uniform light levels at aisle height, which typically increases the number of fixtures required. For high-density racking facilities, a photometric study using actual aisle dimensions and reflectance values is recommended to optimize placement.
This calculator provides a reliable planning estimate for budgeting and initial fixture counts. It uses industry-standard IESNA formulas with ceiling-height-adjusted CU values that are more accurate for industrial spaces than generic calculators. For facilities above 40 ft, unusual room geometries, or applications requiring documented compliance, a full photometric study using manufacturer IES files is the appropriate next step. FSG's lighting team provides photometric designs for warehouse and industrial projects of all sizes.
Coefficient of utilization (CU) is a factor between 0 and 1 that accounts for how efficiently a fixture's light output actually reaches the work surface, factoring in room geometry, surface reflectances, and fixture distribution. In a typical commercial office (low ceiling, light walls), CU is around 0.65. In a tall warehouse (high ceiling, dark walls and floors), CU drops to 0.40 to 0.55 because more light is lost to absorption and the longer throw distance. Using the wrong CU for a warehouse space will underestimate the number of fixtures needed and result in an underlit facility.

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Disclaimer: Results are estimates based on standard IESNA formulas and are intended for planning and budgeting purposes only. Actual fixture counts may vary based on specific fixture photometrics, beam angles, surface reflectances, racking configurations, and local code requirements. Always have final lighting designs reviewed by a licensed electrical contractor or lighting engineer before installation.