If you manage a warehouse, factory, gym or workshop, you have probably seen the round, saucer-shaped fixtures hanging from the ceilings of modern industrial spaces. These are UFO LED high bay lights, and the IP65 waterproof 100W UFO LED high bay with 100-277V dimmable input is one of the most versatile models on the market. This guide explains what it is, how it works and how to choose the right one.
What Is a UFO LED High Bay Light?
A UFO LED high bay is a round, compact fixture designed for ceilings 15 to 40 feet (4.5-12 m) high. Its name comes from its disc shape. Compared with traditional metal halide (MH) or high-pressure sodium (HPS) lamps, it offers:
Much higher energy efficiency
Instant-on light with no warm-up time
Longer lifespan and lower maintenance
A lightweight, compact design with strong heat dissipation
What Do the Key Specifications Mean?
1. 100W Power
A 100W LED typically produces about 13,000-16,000 lumens, depending on efficiency (130-160 lm/W). That is enough to replace a 250W-400W traditional fixture.
2. IP65 Waterproof Rating
6 means completely dust-tight
5 means protected against low-pressure water jets from any direction
This makes the fixture suitable for dusty factories, car washes, covered loading docks and damp environments.
3. 100-277V Wide Voltage
One fixture works on 120V, 220V, 230V and 277V power systems. That simplifies purchasing and inventory for international projects.
4. Dimmable (0-10V)
A dimmable driver lets you lower brightness to save energy, match light levels to the task, or work with motion sensors and daylight harvesting controls.
What Are the Typical Specifications?
| Parameter | Typical Specification |
|---|---|
| Power | 100W |
| Luminous Efficacy | 140-160 lm/W |
| Luminous Flux | 14,000-16,000 lm |
| Input Voltage | AC 100-277V, 50/60Hz |
| Color Temperature | 4000K / 5000K / 6500K |
| CRI | Ra ≥ 80 |
| Beam Angle | 60° / 90° / 120° |
| Dimming | 0-10V |
| IP Rating | IP65 |
| Operating Temperature | -22°F to 122°F (-30°C to 50°C) |
| Lifespan | 50,000+ hours |
| Housing | Die-cast aluminum, black finish |
| Mounting | Hook, eye bolt, chain or pendant |
| Warranty | 3-5 years |
Specifications vary by manufacturer. Always confirm with your supplier's datasheet.
How Much Energy Can You Save?
The table below compares a 100W UFO LED with traditional lighting, assuming 12 hours of use per day and $0.12/kWh.
| Fixture Type | Actual Power | Annual Energy (kWh) | Annual Cost | Annual Saving vs. LED |
|---|---|---|---|---|
| 400W Metal Halide | ~450W (with ballast) | 1,971 | ~$236 | - |
| 250W HPS | ~295W (with ballast) | 1,292 | ~$155 | - |
| 100W UFO LED | 100W | 438 | ~$53 | $102-$183 per fixture |
For a warehouse with 50 fixtures, replacing 400W MH lamps could save over $9,000 per year, before counting reduced maintenance and HVAC load.
What Is the Right Beam Angle and Mounting Height?
| Mounting Height | Recommended Beam Angle | Best For |
|---|---|---|
| 10-15 ft (3-4.5 m) | 120° | Garages, workshops, low-ceiling retail |
| 15-25 ft (4.5-7.5 m) | 90° | Warehouses, gyms, factories |
| 25-30+ ft (7.5-9+ m) | 60° | High-ceiling plants, hangars |
What Are the Best Applications?
| Application | Why It Works |
|---|---|
| Warehouses & distribution centers | Bright, uniform light across aisles and racking |
| Factories & workshops | Durable, dust-tight and vibration-resistant |
| Gyms & sports halls | Flicker-free light, dimmable for events |
| Supermarkets & retail stores | Clean, bright white light that shows products well |
| Car washes & gas stations | IP65 protection against moisture |
| Barns & farms | Resists dust and humidity |
| Cold storage | Reliable starting at low temperatures |
How Do You Choose the Right 100W UFO LED High Bay?
Check these seven points before buying:
Certifications. Look for UL/cUL, DLC and ETL (North America) or CE and RoHS (Europe).
Driver quality. Brands such as Meanwell or Philips offer better reliability.
Real lumen output. Ask for an LM-79 test report, not just a marketing claim.
Heat dissipation. A die-cast aluminum finned design keeps LED chips cooler and extends life.
Dimming compatibility. Confirm that the dimming protocol is 0-10V.
Warranty. Choose at least 3-5 years.
Accessories. Check for a hook, safety cable, motion sensor option and plug.
How Do You Install It?
Turn off the power at the breaker.
Fix the hook or chain to a structural support rated for the fixture's weight.
Hang the fixture using the eye bolt.
Connect line, neutral and ground, plus the dimming wires (purple and gray) if needed.
Check that all cable glands are tight to maintain the IP65 rating.
Restore power and test.
Safety note: Installation should be done by a qualified electrician and follow local electrical codes.
Frequently Asked Questions
Is a 100W UFO LED bright enough for a warehouse?
Yes, for ceilings up to about 25 ft. For higher ceilings or higher light levels, consider 150W-240W models.
Can IP65 fixtures be used outdoors?
They suit covered or semi-exposed areas. For fully exposed outdoor use, make sure the cable entry is properly sealed.
Can I use a regular wall dimmer?
No. It needs a 0-10V dimmer, not a TRIAC wall dimmer.
How long will it last?
Rated life is 50,000+ hours, over 10 years at 12 hours a day.
