The Electrician's Guide
Warehouse LED retrofits and new installs are some of the highest-value commercial lighting jobs in the industry. This guide covers what you need to spec, sell, and install warehouse LED lighting — from fixture selection and layout to voltage, circuiting, and controls.
Whether you're quoting a 10,000 sq ft storage building or a 500,000 sq ft distribution center, this is the practical reference you need.
Why Every Warehouse Is Going LED
You already know LED is better. Here's the pitch your customer needs to hear:
MetricMetal HalideHPSFluorescent T5HOLEDLifespan6,000–15,000 hrs10,000–24,000 hrs15,000–20,000 hrs50,000–100,000 hrsEnergy UseVery HighHighModerateVery LowWarm-Up5–15 min3–10 min1–3 minInstantEfficiency50–90 lm/W50–130 lm/W70–100 lm/W130–200+ lm/WMaintenanceFrequent relamping at heightModerateModerate (ballast failures)Near zero
The bottom line for your customer: 50–75% lower energy costs, near-zero maintenance, and payback in 12–24 months. For a 200-fixture warehouse running 18 hrs/day, that's $39,000+ in annual energy savings alone — before you factor in eliminated relamping costs.
Fixture Selection by Application
UFO High Bays
Use for: Open warehouse floors, staging areas, loading zones, manufacturing floors
Output: 15,000–50,000+ lumens
Mount height: 20–45+ ft
Why: Symmetrical circular pattern, compact form factor, fewer mounting points needed for open areas
Linear High Bays
Use for: Racked storage aisles, narrow corridors, assembly lines
Output: 15,000–45,000+ lumens
Mount height: 20–40+ ft
Why: Distributes light along the fixture's length — ideal for illuminating both the aisle floor and vertical racking faces where pickers read labels
LED Shop Lights / Strip Fixtures
Use for: Receiving areas, packing stations, break rooms, mezzanines, maintenance shops
Mount height: 8–15 ft
Why: Cost-effective for lower-ceiling functional areas. Linkable designs simplify wiring in spaces with limited infrastructure.
Vapor Tight Fixtures
Use for: Cold storage, freezers, food/beverage warehouses, washdown areas
Rating: IP65+
Why: Sealed against moisture, condensation, and ice. Full output at -20°F and below — where fluorescents fail completely.
Flat Panels & Troffers
Use for: Warehouse offices, control rooms, break rooms, admin areas
Why: Standard 2x2 and 2x4 drop-ceiling integration
Wall Packs, Flood Lights & Area Lights
Use for: Loading docks, truck courts, building exteriors, parking, perimeter security
Why: Exterior safety, dock operations, and security camera support
Emergency & Exit Lighting
Use for: All warehouse areas — code required
Why: LED emergency fixtures with battery backup for egress during power failures
Specifying Light Levels by Zone
Under-lighting creates safety hazards and liability. Over-lighting wastes your customer's money. Here's what each zone actually needs:
Warehouse ZoneLumens per Sq FtIES Foot-CandlesBulk / inactive storage10–205–10 fcActive storage / general20–3010–20 fcPicking and sorting30–5020–30 fcPacking and shipping stations50–7030–50 fcReceiving and inspection50–7530–50 fcAssembly / manufacturing50–10030–50 fcLoading dock interiors30–5020–30 fcOffices and admin40–6030–50 fc
Fixture Count Formula
(Square Footage × Required Lumens/Sq Ft) ÷ Lumens per Fixture = Number of Fixtures
Then adjust for layout uniformity — you may need to add or reposition fixtures to eliminate dark spots between mounting points based on beam angle and ceiling height.
Example: 50,000 sq ft warehouse floor, 30 ft clear height, 30 lumens/sq ft required = 1,500,000 total lumens needed. Using 30,000-lumen high bays: 1,500,000 ÷ 30,000 = 50 fixtures on an even grid.
Ceiling Height → Fixture Match
Clear HeightTypical BuildingFixture TypeLumens per Fixture12–20 ftSmall warehouses, mezzaninesLow bay / linear10,000–20,00020–30 ftStandard distribution / generalUFO or linear high bay20,000–30,00030–40 ftModern DCs, bulk storageHigh-output high bay30,000–45,00040–50+ ftLarge DCs, cold storage, mega facilitiesMax-output high bay45,000–60,000+
Color Temperature & CRI Recommendations
Color Temperature:
- 4000K (Neutral White): Less fatiguing for extended shifts. Good visibility, slightly warmer feel.
- 5000K (Daylight): The warehouse standard. Maximum visibility, alertness, and color accuracy. Best for picking, packing, and inspection.
- 5000K–6500K (Cool Daylight): Inspection and QC zones only. Some workers find it harsh for full shifts.
CRI (Color Rendering Index):
- CRI 70–79: Basic storage areas where color accuracy isn't critical.
- CRI 80–89: Standard for most warehouse zones. Labels, color codes, and markings are clearly visible. This is the spec for picking, packing, and general operations.
- CRI 90+: Inspection areas, pharmaceutical, cosmetics, food grading — anywhere color accuracy affects compliance or quality.
IP Ratings by Zone
IP RatingProtectionWhere to UseIP20Basic indoorClimate-controlled offices, dry storageIP44Splash protectionGeneral dry warehousing, break roomsIP65Dust-tight, water jet resistantCold storage, food/beverage, washdownIP66Dust-tight, powerful water jetFreezers, food processing, aggressive cleaningIP67Dust-tight, temporary immersionExtreme cold storage, flood-prone dock pits
Electrical: Voltage, Circuiting & Infrastructure
Voltage Selection
- 120V: Workable for small facilities with limited fixtures. Higher amperage, shorter runs.
- 277V: The warehouse standard. Lower amperage = smaller wire gauges, longer runs without voltage drop, more fixtures per circuit. Significantly reduces electrical infrastructure costs.
- 480V: Large industrial facilities with 480V three-phase service. Maximum electrical efficiency.
Always verify available voltage at the facility's distribution panels before specifying fixtures.
Circuit Planning
Calculate total connected wattage per circuit with safety margin:
- A 20A / 277V circuit supports approximately 4,400W — typically 25–30 high bay fixtures at 150W each.
- A 20A / 120V circuit supports approximately 1,920W — only about 12 fixtures at 150W.
This is why 277V is standard for warehouses — it cuts the number of circuits and home runs required.
Emergency Power
Building codes require emergency egress lighting. Two approaches:
- Integrated battery backup fixtures (simplest for retrofits)
- Generator-connected circuits for a portion of the lighting system
Control Wiring
If the job includes occupancy sensors, daylight harvesting, or networked controls — plan low-voltage control wiring or wireless infrastructure during the install, not after.
Mounting Methods
- Pendant / Chain Mount: Most common warehouse method. Fixtures hang from chains or aircraft cables attached to roof structure. Allows height adjustment.
- Surface / Flush Mount: Direct to ceiling deck. Use when maximum headroom is needed or ceilings are lower.
- Hook Mount: Quick-install with V-hooks or carabiner clips. Good for smaller fixtures and spaces where easy maintenance access matters.
Retrofit vs. New Construction
Retrofit (Replacing Existing)
Most warehouse LED jobs are retrofits. Two options:
- One-for-one replacement: Remove old fixtures, install new LED on existing mounting points. Cleanest result, best performance. This is the preferred approach.
- Retrofit kits: Convert existing housings to LED. Can work but limits fixture options and performance.
New Construction
Design from scratch — optimize fixture placement, circuiting, and controls without legacy constraints. Typically results in fewer, higher-output fixtures compared to retrofitting a layout designed for less efficient technology.
Controls That Add Value (and Margin)
Occupancy / Motion Sensors
The single highest-ROI add-on. Most warehouse aisles are unoccupied most of the time. Motion sensors bring fixtures to full output when someone enters and dim to standby when the area is empty. Typical additional savings: 40–60% beyond the base LED conversion. This is an easy upsell that cuts the customer's payback period in half.
Daylight Harvesting
For warehouses with skylights or translucent wall panels. Photosensors auto-dim fixtures when natural light is sufficient.
Zoned Scheduling
Different zones = different schedules. Shipping docks may run 6 AM–midnight while bulk storage runs a single shift. Programmable zone controls eliminate waste.
Networked Controls
Connects all fixtures to a central platform for remote monitoring, scheduling, dimming, and energy tracking. Adds the most value for larger facilities and multi-site operators.
Selling the ROI to Your Customer
Here's a quick comparison table you can use in proposals:
Metal Halide (400W)LED High Bay (150W)Annual kWh (18 hrs/day)2,628 kWh986 kWhAnnual Cost @ $0.12/kWh$315.36$118.26Annual Savings per Fixture—$197.10200-Fixture Warehouse—$39,420/yr saved
Add maintenance elimination (no more relamping at 30–40 ft with lifts) and utility rebates ($25–$100+ per fixture in most territories), and most warehouse conversions pay for themselves in 12–24 months.
Why Spec PrimeLights
Built for the trades since 2010. Over 150,000 customers. 4.9 stars.
- Real Lighting Pros Answer: Call or text (512) 843-1383 for help speccing any warehouse job. No automated menus, no chatbots.
- Free & Fast Shipping: Most orders ship within 24 hours. Free shipping, no minimum.
- Custom Packaged for Safe Delivery: Every fixture packed by hand in custom packaging. No damage, no jobsite delays.
- Tested & Proven Specs: Honest lumen counts, honest efficiency ratings. What we print is what you get.
- Volume & Contractor Pricing: Warehouse jobs mean volume. Our pricing reflects that.
- Complete Product Range: High bays, linear bays, shop lights, vapor tights, dock lights, area lights, emergency fixtures — everything the job needs from one source.
Ready to Quote a Warehouse Job?
Call or text (512) 843-1383 and talk to a real lighting pro. We'll help you calculate fixture counts, select the right products for each zone, and build a quote that wins the job.
Or use the PrimeLights Fixture Calculator for a quick estimate on fixture count by space dimensions.
