Frequently Asked Questions

• How do I determine how many LED Linear High Bay Lights I need for my space?

  You can use the formula: Number of fixtures = Area (sq ft) × Target foot-candles ÷ Lumens per fixture. For example, for a 10,000 sq ft warehouse with a target of 30 foot-candles, you would need about 6-7 fixtures.

• How many linear high bay lights do I need for my warehouse or shop?

  Use this quick formula: Fixtures needed = Floor area (sq ft) × Target foot-candles ÷ Lumens per fixture IES-recommended foot-candle targets by application: | Space type | Target (fc) | Example: 10,000 sq ft with 300W (45,000 lm) | |-----------|------------|---------------------------------------------| | General storage / aisles | 20–30 fc | ≈ 7–10 fixtures | | Shipping, receiving & order picking | 30–50 fc | ≈ 10–13 fixtures | | Assembly / manufacturing | 50–75 fc | ≈ 12–17 fixtures | | Quality inspection / detail work | 75–100 fc | ≈ 17–23 fixtures | Add 10–15% to your calculated fixture count to compensate for wall reflectance loss and long-term lumen depreciation. G GJIA offers a [free lighting calculator](https://ggjia-led.com/pages/lights-caculator) and complimentary layout design service — email support@ggjia-led.com with your floor dimensions.

• Where are LED linear high bay lights typically used?

  G GJIA Linear High Bay's rectangular form factor delivers uniform, aisle-friendly illumination — ideal anywhere with fixed shelving, racking, or a long narrow layout: Warehouses & distribution centers — mount along aisles to minimize shadows between racks Manufacturing plants & factories — CRI 80+ for accurate color on the production floor Auto repair & body shops — prismatic diffuser eliminates glare on vehicle surfaces Retail stores & showrooms — 4000K/5000K CCT selection renders merchandise colors accurately Gyms & sports facilities — high output, anti-glare optics for overhead sport lighting Garages, workshops & farm buildings — IP65-rated for dusty or damp environments Cold storage & food processing — sealed housing, RoHS-compliant, low-maintenance

• What's the difference between 4000K and 5000K color temperature? Which should I choose?

  All G GJIA linear high bays are available in both 4000K and 5000K. Here's how to choose: | Color temperature | Appearance | Best for | |------------------|-----------|---------| | 4000K neutral white | Natural, comfortable, close to warm daylight | Retail, showrooms, offices, mixed-use spaces where people work long shifts | | 5000K cool white / daylight | Crisp, high-contrast, alert-promoting | Manufacturing, auto shops, inspection lines, sports facilities, anywhere visual acuity matters | Default recommendation for industrial and warehouse use: 5000K. It boosts contrast, reduces eye strain on detail tasks, and aligns with DLC performance preferences. Choose 4000K when human comfort during extended dwell times is the priority.

• What applications are best suited for LED Linear High Bay Lights?

  LED Linear High Bay Lights are ideal for various commercial environments including warehouses, garages, manufacturing workshops, retail showrooms, and other high-ceiling areas where effective illumination is crucial.

• What's the difference between linear high bay and UFO (round) high bay lights? Which one should I get?

  The core difference is light distribution pattern: | Factor | Linear high bay | UFO high bay | |--------|----------------|-------------| | Shape | Rectangular, strip form | Round, disc form | | Beam angle | 90° — focused, narrow spread | 120° — wide, omnidirectional | | Best layout | Aisle-based, shelving, rectangular floor plans | Open-floor, column-free spaces | | Max install height | Up to ~35 ft recommended | Up to 40–50 ft | | Typical use | Warehouse aisles, auto shops, retail racks | Gyms, hangars, open manufacturing floors | | Retrofit from fluorescent | Direct 1:1 for T5/T8 fixtures | Better 1:1 for round HID |

• Do you offer bulk pricing or wholesale discounts for large orders?

  G GJIA ships from US warehouses and offers tiered pricing: - Product pages offer 1-Pack, 4-Pack, and 30-Pack bundles; the 30-Pack on the 400W model saves up to 45% off single-unit pricing - Contractors and facility managers can request additional project pricing — visit the [Wholesale page](https://ggjia-led.com/pages/flash-sale) or call (346) 490-6412 - Free lighting layout design for orders of 10+ fixtures — email support@ggjia-led.com with your floor plan or dimensions - Free shipping on qualifying orders within the contiguous US

• How efficient are these lights — and how much energy do they save vs. metal halide or fluorescent?

  G GJIA linear high bays are rated at 150 lm/W — a benchmark in the top tier of commercial LED fixtures. For comparison: | Light source | Efficiency | Equivalent output to 900W MH | |-------------|-----------|------------------------------| | G GJIA 130W LED | 150 lm/W | Replaces a 400W metal halide | | G GJIA 300W LED | 150 lm/W | Replaces a 900W metal halide | | Metal halide (HID) | ~80 lm/W | Baseline reference | | T5 fluorescent high bay | ~95 lm/W | — | Switching from metal halide to G GJIA LED typically cuts lighting energy consumption by 65–75%. A facility running 20 × 300W fixtures for 12 hrs/day at $0.12/kWh can expect to save roughly $6,300 per year in electricity costs alone — before factoring in maintenance savings or DLC utility rebates.

• Are these lights waterproof or dustproof? Can they be used outdoors or in wet locations?

  G GJIA linear high bays carry an IP65 rating, which means: - IP6X — fully dust-tight: no dust particles can enter the housing under any circumstances - IPX5 — water-jet resistant: protected against low-pressure water jets from any direction Suitable environments: auto shops with spray hoses, food production areas with steam or vapor, sawmills and woodshops with heavy sawdust, agricultural buildings, cold storage with condensation.

• What voltage does the light run on? Does it work with 480V industrial power?

  Standard G GJIA Linear High Bay models operate on AC 120–277V, covering virtually all North American commercial and light-industrial power supplies — standard single-phase and most three-phase systems — with no step-down transformer required. For 480V three-phase environments (heavy industrial facilities), G GJIA offers a dedicated 480V LED lighting series. Contact customer service to confirm the right model for your electrical specification.

• How long do these lights last, and what is the warranty?

  G GJIA linear high bays are rated for 50,000 hours at L70 — meaning brightness stays above 70% of the original output for the full 50,000 hours under rated conditions. | Operating hours per day | Years of useful life | |------------------------|---------------------| | 8 hrs/day (single shift) | ~17 years | | 12 hrs/day (extended hours) | ~11 years | | 24 hrs/day (continuous operation) | ~5.7 years | Metal halide fixtures typically last 15,000 hours — meaning G GJIA LEDs last 3× longer and eliminate the recurring cost of bulb replacements, ballast failures, and lamp disposal. Warranty: G GJIA covers all linear high bay fixtures with a 5-year manufacturer's warranty against defects in materials and workmanship, with free replacement within the warranty period.

• How do I install a linear high bay light? Do I need an electrician?

  G GJIA linear high bays support three mounting configurations: - Chain or cable suspension (most common): adjustable hanging height, ideal for open spaces with high clearance - V-hook surface mount: directly to structural beams for a low-profile installation - Wall bracket mount: G GJIA sells a compatible [90° wall mount bracket](https://ggjia-led.com/products/90-degree-wall-mount-bracket-with-2-3-8in-od-tenon) separately Each fixture ships with a 6-inch wire lead and standard wiring terminals.

• What spaces are linear high bay lights best suited for?

  G GJIA linear high bays use a rectangular housing with a 90° beam angle, concentrating light precisely along aisles and work surfaces rather than scattering it over rack tops. Best-fit applications: - Warehouses & distribution centers — mount along rack aisles for uniform, shadow-free coverage - Manufacturing & assembly plants — CRI 80+ color rendering supports inspection and color-critical tasks - Auto body shops & paint booths — prismatic diffuser eliminates glare on painted surfaces - Retail showrooms & big-box stores — 4000K/5000K options render merchandise colors accurately - Gyms & sports facilities — high-output, glare-controlled illumination for active spaces - Garages, workshops & farm buildings — IP65 rating handles dust and occasional moisture - Cold storage & walk-in freezers — operates reliably in low-temperature environments

• What wattage linear high bay light do I need for my ceiling height?

  Ceiling height is the single most important spec when choosing a linear high bay. Here's the complete G GJIA selection guide: | Ceiling height | Recommended wattage | Lumen output | Model | |---------------|--------------------|--------------| ------| | 15–20 ft (4.5–6 m) | 130W | 19,500 LM | LED Linear High Bay Lighting | | 20–30 ft (6–9 m) | 210W | 31,500 LM | 210W LED Linear High Bay | | 30–40 ft (9–12 m) | 300W | 45,000 LM | Linear High Bay Lights | | 40 ft+ (12 m+) | 400W | 60,000 LM | 400W LED Linear High Bay |