UFO vs Linear High Bay: Which High Bay Light for Your Facility

Round UFO high bays outsell linear high bays in export markets — partly on looks, partly on price. But facilities with tall racking, narrow aisles or long production lines often get dramatically better light from the linear format. The choice is not round-versus-rectangular aesthetics; it is beam geometry against your floor plan.

The fundamental difference: beam vs row

• UFO (round) high bay. One compact housing, one optic, one wide beam — typically 60°, 90° or 120°. It throws a circular pool of light downward, ideal over open floor areas, mezzanines and machinery without tall racking.
• Linear high bay. A long housing with a row of LEDs and a batwing or aisle optic. It spreads light along a line, which is exactly the shape of a racking aisle, a production line or a conveyor run.

Decision table

Facility situation	Better choice	Why
Open workshop, no racks above ~6 m	UFO, 90° beam	Wide even pool, lowest cost per lumen, fastest install
Warehouse with racking over 6 m	Linear with aisle optic	Beam follows the aisle; vertical lux on rack faces instead of wasted light on rack tops
Very high ceiling (10 m+)	UFO, 60° narrow beam	Concentrates delivered lux at floor; wide beams wash walls at height
Production / assembly lines	Linear, continuous rows	Uniformity along the work plane, fewer shadows at benches
Gymnasiums, hangars, domed roofs	UFO, 120°	Wide throw covers irregular geometry; compact weight eases mounting
Cold storage / food plants	Either, IP65+ with low-temp driver	Format matters less than sealing and -25 °C component rating

Heat, driver and the specs that decide lifespan

At 100–200 W in a compact UFO housing, thermal design separates a 50,000-hour fixture from a 20,000-hour one. Check three things on the datasheet: the LED junction-to-case thermal path (a full aluminum housing beats a stamped thin shell), the driver brand and rating (wide-voltage 100–240 V or 100–277 V for industrial sites with unstable grids), and the surge rating (4 kV minimum for industrial; 6–10 kV where lightning exposure or long feeder runs exist). For dusty or humid halls, IP65 with a conformal-coated driver board is the practical floor.

Wattage and spacing sanity check

At 8–12 m mounting height, 100–150 W UFO units on 6–8 m grids typically deliver 200–300 lux at floor for general industry; warehousing with racks needs a Dialux run to balance horizontal lux against vertical illuminance on labels. If your supplier cannot return a Dialux calculation within a project quote, that is a service gap you will feel on every tender — we include it as standard.

Frequently asked

Can UFO high bays replace linear fluorescents one-for-one?

Physically yes, photometrically no. Two 150 W UFOs rarely equal two 2×54 W battens in aisle uniformity. Recalculate spacing from the IES file rather than copying the old layout.

Is 100-277 V worth paying for?

In markets with unstable industrial grids or where one SKU must serve 220–240 V and 277 V regions, yes — it also rides through voltage sags that kill narrow-range drivers early.

Do you supply dimming and sensor options?

0–10 V dimming is standard on our industrial high bays; microwave motion sensors and daylight harvesting are available per SKU — useful for warehouses where 70% of operating hours have no aisle traffic.