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Five series: what actually separates them

The five ranges answer different questions, and the difference is not the wattage label. X is the value UFO built on SMD2835 with a 130 or 150 lm/W driver and a 120° lens — the standard unit when a warehouse is being relamped on a budget. H03 is the same form factor at 180 lm/W with PHILIPS or SAN'AN chips, a 0.95 power factor and interchangeable 60°, 90° and 120° lenses, which is what you specify when the electricity cost or the fixture count matters more than the unit price.

M and T are the export ranges: both are built for 100-277V, 277-480V and 120-347V circuits, reach 140-190 lm/W and cover 100W to 300W, so a North American 480V job and a European 230V job can use the same housing. LHB is a linear high bay, not a UFO: PHILIPS chips, Meanwell drivers, CRI above 80, 130 lm/W and IP54, intended for racking aisles and lower ceilings where the fixture has to throw light sideways rather than straight down.

Figures are taken from the published specification table of each model in this category. A series without a lens column is quoted per project because the optic is chosen for the layout, not from the catalogue.

Mounting height decides the wattage

High bay sizing is driven by the mounting height and the task illuminance, not by floor area alone. The calculation used below is area per fixture = lumens x 0.48 ÷ target lux, where 0.48 is a utilisation factor of 0.6 for a high ceiling multiplied by a light-loss factor of 0.8. The reference target is 100 lux on the working plane, which is the normal figure for picking, packing and forklift movement; storage-only areas can drop to 50 lux and inspection benches need 300 lux.

Height also changes the optic. Below 8 m a 120° lens gives even light with few fixtures; above 12 m the same lens wastes light on the racking faces, and a 60° or 90° lens with tighter spacing produces the same floor illuminance with less glare in the aisles.

* Calculated at CU 0.6 and LLF 0.8 on a flat working plane. Grid spacing assumes a square layout with the fixture at the centre of each cell. Racking, mezzanines and cranes change the answer — send the drawing and we return a DIALux or Relux layout with the fixture count.

Replacing metal halide and HPS high bays

The old fixture is normally a 250W to 1000W metal halide or high-pressure sodium high bay drawing 10-15% more than its lamp rating through the ballast. Because the LED equivalent is quoted in delivered lumens, the replacement lands at roughly one third of the old wattage, and the fixture also removes the 30% output drop that a metal halide lamp shows after two years.

Two practical checks before ordering. First, confirm the existing circuit voltage: a 480V three-phase run needs the M or T series, not the 100-277V X series. Second, count the fixtures rather than the watts — a 12 m ceiling lit by 400W metal halide at 8 m spacing usually needs the same number of 200W UFO fixtures at the same spacing, which halves the load without changing the lighting design.

* System lumens use 65 lm/W including ballast losses and lamp depreciation.

Optics: UFO versus linear, and which lens for which ceiling

A UFO high bay throws a circular pool of light; a linear high bay throws an elongated one. In a clear-span warehouse with 8-12 m ceilings the UFO is cheaper per lux and easier to re-aim. In a racking aisle the linear fixture mounts over the aisle and lights the rack faces on both sides, which is why LHB is the usual choice for narrow-aisle and AS/RS buildings.

Lens choice follows the same logic in one dimension: a 60° lens concentrates the output for ceilings above 12 m, a 90° lens is the default for 8-12 m, and a 120° lens spreads the light for 6-8 m ceilings where evenness matters more than reach. H03 offers all three on the same housing, so a mixed-height building can use one part number with two lens options.

M series optics are quoted per project against the layout.

Housing, IP rating and certification

The UFO ranges use a die-cast aluminium body with a polycarbonate or glass optic; the X and H03 series are sealed to IP65, which covers dust and water jets and is the correct grade for a warehouse or a workshop. LHB is IP54 because a linear fixture is normally used indoors on a dry ceiling, and specifying IP65 there buys nothing.

All ranges run at a power factor of 0.9 or better (0.95 on H03, M and T) and total harmonic distortion below 20%, which matters where a utility rebate or a generator-backed site is involved. Photometric files, LM-79 reports and LM-80 LED data are available for most models.

ใบรับรองs and test reports are listed on the certificate page.

Frequently asked questions

Related ranges: UFO high bay for clear-span storage, tri-proof lights for wash-down and cold stores, LED flood lights for yards and loading docks, and LED panel lights for offices inside the same building. For the design method behind these numbers see the guide to warehouse lighting design.