
Modern LED high bay lights can cut warehouse lighting energy costs by 60-70% while improving visibility, safety, and worker productivity.
This comprehensive guide covers everything you need to know about selecting and installing LED high bay lights for warehouses, factories, gymnasiums, and other high-ceiling applications.
1. What Are LED High Bay Lights?
High bay lights are designed for spaces with ceiling heights of 15-50+ feet. The term ‘high bay’ distinguishes them from ‘low bay’ fixtures used under 15 feet. LED high bays have revolutionized industrial lighting by delivering 50,000-60,000+ lumens per fixture at 130-150 lumens per watt—far exceeding metal halide (80-100 lm/W) and fluorescent (70-90 lm/W). LED high bays come in two main form factors: **UFO High Bays** (round, disc-shaped) and **Linear High Bays** (rectangular, tube-shaped). Each has specific advantages depending on application. UFO high bays are ideal for open warehouse spaces with uniform coverage needs. Linear high bays excel in aisle lighting and spaces requiring directional control. Both types offer instant-on capability, no warm-up time, and work reliably in cold environments—major advantages over traditional HID fixtures.
- Designed for ceilings 15-50+ feet high
- 130-150 lm/W efficiency vs 80-100 for metal halide
- Two types: UFO (round) and Linear (rectangular)
- Instant-on, no warm-up time
- Excellent cold-weather performance
2. UFO vs Linear High Bay: Choosing the Right Type
**UFO High Bays** feature a circular design with light output distributed 360 degrees horizontally. They’re ideal for open warehouse spaces, manufacturing floors, and gymnasiums where uniform coverage is the goal. Typical wattages: 100W-500W. Lumen output: 12,000-70,000 lumens. Mounting: Hook/chain or pendant. **Linear High Bays** provide directional light along their length, making them perfect for aisle lighting in warehouses, retail stores, and manufacturing lines with equipment rows. Better control means less wasted light. Typical wattages: 120W-480W. Lumen output: 16,000-65,000 lumens. Mounting: Chain, pendant, or surface. **Selection Guide**: Choose UFO for open spaces and general illumination. Choose Linear for aisles, shelving rows, and spaces with defined traffic patterns. Many facilities use both—Linear in aisles, UFO in open areas.
- UFO: 360° horizontal distribution, open spaces
- Linear: Directional, ideal for aisles and rows
- UFO: 100W-500W, 12,000-70,000 lumens
- Linear: 120W-480W, 16,000-65,000 lumens
- Use both types in complex facilities
3. Wattage Selection by Ceiling Height
Matching fixture wattage to mounting height ensures adequate illumination at floor level. **15-20 foot ceilings**: 100W-150W fixtures deliver 12,000-20,000 lumens, suitable for storage areas and basic warehouse operations. **20-30 foot ceilings**: 150W-300W fixtures (20,000-40,000 lumens) for general warehousing, manufacturing, and distribution centers. **30-40 foot ceilings**: 300W-450W fixtures (40,000-60,000 lumens) for high-bay warehouses and large manufacturing facilities. **40+ foot ceilings**: 450W-600W+ fixtures for aircraft hangars, stadiums, and mega-warehouses. As a rule of thumb, each 5 feet of additional ceiling height requires roughly 20% more lumens for equivalent floor-level brightness. Higher ceilings also benefit from narrower beam angles to maintain intensity. For precise planning, consult an IES file and perform a lighting calculation.
- 15-20 ft: 100W-150W, 12,000-20,000 lm
- 20-30 ft: 150W-300W, 20,000-40,000 lm
- 30-40 ft: 300W-450W, 40,000-60,000 lm
- 40+ ft: 450W-600W+, 60,000+ lm
- Add 20% lumens per 5 ft of extra height
4. Lumen Requirements by Application
Different activities require different illumination levels per IES standards. **Storage Warehouses**: 10-30 foot-candles (100-300 lux) for general storage operations. Lower levels acceptable in low-traffic areas. **Picking/Packing Areas**: 30-50 foot-candles (300-500 lux) where workers read labels and perform detailed tasks. **Manufacturing Floors**: 30-100 foot-candles (300-1000 lux) depending on task complexity. Precision manufacturing requires higher levels. **Gymnasiums**: 30-75 foot-candles (300-750 lux) for recreation, 75-150 fc for competition. **Retail Warehouses/Wholesale**: 50-100 foot-candles (500-1000 lux) for product visibility and customer experience. Calculate total lumens needed: Area (sq ft) × Target Foot-Candles = Required Lumens. Then divide by fixture lumens to determine quantity. Add 10% for aging fixtures and dirty environments.
- Storage: 100-300 lux (10-30 fc)
- Picking/Packing: 300-500 lux (30-50 fc)
- Manufacturing: 300-1000 lux by task
- Gyms: 300-1500 lux by competition level
- Formula: Area × Target FC = Required Lumens
5. Spacing and Layout Guidelines
Proper spacing ensures uniform illumination without dark spots or excessive overlap. **General Rule**: Space fixtures at 1.0-1.5 times the mounting height. For a 25-foot ceiling, space fixtures 25-37 feet apart. **UFO High Bays**: Square grid pattern, typically 1.2× mounting height spacing. **Linear High Bays**: Row spacing at 1.0-1.2× mounting height. Align rows with aisles or work areas. **Factors affecting spacing**: Beam angle (wider = more spacing possible), fixture output (higher lumens = more spacing possible), uniformity requirements (critical tasks need tighter spacing). For warehouses with racking, mount fixtures in the aisle between racks rather than above racks. This directs light where it’s needed and prevents shadows from racked goods. Use lighting simulation software (AGi32, DIALux) for complex layouts to verify uniformity and coverage.
- Spacing = 1.0-1.5× mounting height
- UFO: Square grid, 1.2× height spacing
- Linear: Rows aligned with aisles
- Mount between racks, not above them
- Use lighting software for complex layouts
6. Energy Savings and ROI
LED high bay retrofits deliver rapid payback. **Typical Savings**: Replace 400W metal halide with 150W LED (same light output). Energy savings: 62.5%. **Cost Calculation**: For a 50,000 sq ft warehouse with 30 fixtures running 12 hours/day: Metal halide: 30 × 400W × 12hr × 365 = 52,560 kWh/year. LED: 30 × 150W × 12hr × 365 = 19,710 kWh/year. Savings: 32,850 kWh × $0.12/kWh = $3,942/year. **Payback**: At $150 per LED fixture ($4,500 total), payback is just over 1 year. Add utility rebates ($20-100 per fixture) and the ROI improves further. **Additional Savings**: No relamping costs (LEDs last 50,000+ hours vs 20,000 for metal halide). Reduced HVAC load (LEDs produce less heat). Fewer fixture replacements due to longer life.
- 150W LED = 400W metal halide equivalent
- 62.5% energy savings typical
- 1-2 year payback common
- Utility rebates reduce costs further
- Plus: No relamping, lower HVAC load


