CircLED Round High Bay Light Fixture, photographed from below, UFO light

CircLED™ Round LED High Bay Light  Thermal Polymer Fixture

Features and Benefits

  • A lightweight alternative to die-cast fixtures, weighing just 15 lbs.*
  • Damp location rated for protection against moisture.
  • Thermally conductive polymer housing ensures superior heat dissipation and a long operational lifespan.
  • Contractor-friendly and easy to install.
  • Designed for use with a round LED PCB module and can accommodate an occupancy sensor.
  • Available with a flat lens glass in clear or frosted.
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Overview

The CircLED™ high bay is a high-performance lighting solution for industrial and commercial use. Constructed from a thermally conductive molded polymer, its design offers a lighter alternative to traditional die-cast fixtures while ensuring optimal thermal management. The fixture carries a damp location listing, so it holds up in humid and condensation-prone spaces like warehouses, loading docks, and
cooler entryways. Wondering why molded polymer beats die-cast aluminum? See the FAQ below.



Applications

  • Manufacturing, warehouse, and distribution facilities
  • Automotive repair shops and service bays
  • Aircraft hangers with vibration and temperature extremes
  • Industrial laundries and textile facilities
  • Metal fabrication shops with welding operations
  • Gymnasiums and University buildings
  • Electronics manufacturing clean rooms

Certifications

Damp Location Listed - Rated for humid and sheltered areas without direct water exposure
F1 Rated - UL 746C certified for outdoor UV and moisture resistance
UL Listed - Safety certified by Underwriters Laboratories to UL 1598
RoHS Compliant - Free of lead, mercury, and other hazardous substances
5-Year Warranty - LED fixture coverage for materials and workmanship

Damp Location Listed

A damp location listing means the fixture is safety certified for areas that stay humid or see occasional moisture, as long as it is not exposed to direct rain or water spray.

What it covers: Sheltered spaces where condensation forms on the housing, humidity stays high, or the air carries moisture. The enclosure, gasketing, and electrical components are evaluated to keep water out under those conditions.

Best for: Covered walkways and canopies, parking garages, loading docks, warehouses, basements, and cooler or freezer entryways. For direct rain or hose-down cleaning, choose a wet location listed fixture.

F1 Rated Material (UL 746C)

This fixture uses F1-rated polycarbonate, which has been tested for long-term outdoor use.

What was tested: The material spent 1,000 hours under intense UV light (simulating years of sun exposure) plus 7 days soaking in 158°F water. After all that, it still had to keep its strength, impact resistance, and fire safety rating.

Why it matters: The lens and housing won't yellow, crack, or break down from years of sun and moisture exposure. Your fixture will look and perform like new for much longer.

UL Listed (UL 1598)

UL (Underwriters Laboratories) is one of the most respected safety testing organizations in the world. A UL listing means the product was sent to their labs, taken apart, tested extensively, and verified to meet strict safety standards.

What they test: Electrical safety, fire hazard prevention, material durability, and proper construction. For lighting, UL 1598 specifically covers luminaires (light fixtures).

Why it matters: Most building codes require UL-listed electrical equipment. It's your assurance that the fixture won't cause fires, electrical shocks, or other safety hazards when installed correctly.

RoHS Compliant

RoHS stands for "Restriction of Hazardous Substances." It's a set of rules from the European Union that limits dangerous chemicals in electronics.

What's restricted: Lead, mercury, cadmium, hexavalent chromium, and certain flame retardants. These substances can harm people during manufacturing and pollute the environment when products are thrown away.

Why it matters: RoHS-compliant products are safer for workers who make them, safer for you to use, and less harmful to the planet when they're eventually recycled or disposed of.

5-Year Limited Warranty

Complete Fixture Coverage (5 Years): SLP Lighting provides a five (5) year limited warranty on fully assembled luminaires bearing a complete SLP Lighting part number. This warranty applies exclusively to fixtures manufactured with SLP Lighting LED boards, drivers, and internal wiring, assembled and tested at our facility. Coverage includes defects in materials and workmanship under normal use and installation conditions per product specifications.

Component & Parts Coverage (1 Year): Individual components, replacement parts, and sub-assemblies sold separately—including but not limited to LED boards, drivers, lenses, housings, and wiring harnesses—are covered under a one (1) year limited warranty from date of purchase. This includes components purchased by OEM customers for integration into third-party assemblies.

Warranty Exclusions: Coverage does not extend to damage resulting from improper installation, misuse, unauthorized modification, operation outside specified parameters, or integration of SLP components into non-SLP assemblies. Warranty claims require proof of purchase and the original SLP Lighting part number.

Determining Coverage: The applicable warranty period is determined by the product configuration at time of sale. Purchase of a complete, factory-assembled fixture with a full SLP part number qualifies for five-year coverage. Purchase of individual components or parts qualifies for one-year coverage, regardless of end-use application.

Specification Table

Ambient Operating Temperature -30 to 50 °C (-22 to 122 °F) Beam Angle 120°
Certifications/Compliance UL 1598, Made in USA CCT 4000K, 5000K
CRI 80 CRI, 90 CRI Dimmable Yes
Diameter 18 inches Driver Meanwell
Environmental Rating Damp Location Rated Housing Material Thermally Conductive Molded Polymer
Input Connection 3/4" NPT/M20 Cord Grip Lens Options Clear Glass, Frosted Glass
Lumens Varies by Configuration Mounting Eyebolt
Operating Voltage Universal (120-277 VAC) or High Voltage (347-480 VAC) Optional Features Emergency Backup (30W), White Wall Diffuse Reflector, Remote Box
Product Type Round LED High Bay Light Weight 15 lbs
Wattage Options Varies by Configuration Warranty Contact Manufacturer
  • FAQ

    Why polymer instead of die-cast aluminum?

    The housing is the heat sink, molded from Makrolon TC621 instead of cast metal. Covestro simulated and tested it to 200 watts.

    Doesn't aluminum conduct heat better?

    Yes, 80 to 160 W/m·K against TC621's 16. But a UFO high bay cools in still air, and metal can't use conductivity the air won't carry away.

    Isn't a plastic heat sink a warning sign?

    Ordinary plastic conducts 0.2 W/m·K. TC621 conducts 16, and in published testing a 20 W/m·K housing ran two to five degrees hotter than the aluminum it replaced.

    How does a plastic conduct heat?

    Graphite, the same material in a pencil, is compounded into the polycarbonate. It pulls heat off the board and spreads it across the fins.

    What is pot metal?

    Cheap castings made from whatever scrap alloy runs cheapest, often zinc-heavy. Imported UFO high bays rarely name the alloy, so you can't look up its conductivity.

    Why does housing temperature matter?

    LED life drops from 80,000 hours to 20,000 between 115°C and 135°C. The housing controls that number.

    Does molding change the fins?

    Die-cast fins are limited by what the tool can release. Molding shapes them for airflow.

    Will polymer melt or burn?

    TC621 is UL 94 V-0 at 2.0 mm and holds shape to 125°C. It's f1 rated under UL 746C for UV and moisture.

    Does the housing corrode?

    No. There's no metal in the housing to oxidize, so salt air and washdown humidity don't pit or rust it.