10,800 Lumens - ArcBright 4 PRO - 4' Curved LED Low Bay - 5000K


The ArcBright series, is the Lumen Right signature fixture.  Featuring a true flush mount back and angled front that gives you 30% more coverage than traditional 4' fixtures.  Delivering 10,800 Lumens using less energy than an 80W incandescent light bulb, this is truly one of the most efficient fixtures on the market at 150 lumens per watt.  

In stock - ships in 1 business day

Mounting: Flush Mount Hardware Standard
Sizing guide

Pickup available at Lumen Right Round Rock

Usually ready in 24 hours

Certifications: UL, Damp Rated, and ETL Sanitation Certified
Total Lumens: 10,800
Power Consumption: 72 Watts
Color Temperature: 5000K (Sunlight White)
Color Rendering Index: >83
Efficacy: 150 Lumens per watt
Beam Angle: 160° (more concentrated light)
Dimming: Not available on removable tube fixtures
Recommended Mounting Height: 9' - 15'
Included Lamps: (4) 18W, Aluminum/Polycarbonate
Warranty: 10 Years (Bulbs and Fixture)
Voltage: 120V to 277V Universal Voltage, 50/60 HZ
Amperage: 0.87@120V, 0.38@277V
Dimensions: L: 48 1/8" x W: 11 3/8" x D: 3 5/8"
Weight: 9lbs 5oz, without bulbs/reflector = 6lbs 6oz
Mounting: Flush Mount screws included - see accessories for hangers
Rated Life: 50,000 Hours
Temperature Range: -4° - 115° (operation outside may lower lifespan)
Part Number: LABL-4S5K-48WF or LABL-4S5K-48WC (hangers)
Lamp Type: 4' T8 bi pin with Frosted Lens

  • This ArcBright 4 PRO puts out more light than seven 100-watt light bulbs, while using only 10% of the power.

  • Curved, sloping high bay design offers 30% more coverage and a more uniform light distribution than traditional, flat high bays.

  • Fixtures are machined in the USA of 20 gauge steel that is sourced right here in America, so you know it's durable and will last for the long haul! We guarantee it!

  • Toolless removal of reflector makes this a truly quick install fixture.

  • Best in the industry, high performance, color coded lamp holders made in Italy. Red designates the wired/hot side of the fixture and green for the non-powered side.

  • This is a true flush mount fixture. It is curved on the front, but completely flat on the back. There are no large obstructions on the rear - just a few screw heads and 1/8' tab for the wiring door.

  • Easy Installation, many DIY'ers will be able to install without an electrician. Each fixture includes detailed instructions and our website has all the tutorials to help you save money and install yourself if you choose.

  • Ideal mounting height is 15' and under.

Customer Reviews

Based on 42 reviews Write a review

Customer Reviews

Based on 1 review
Amazing light, a total beast

I bought this as the main light for my garage. It replaced an old 4 tube fluorescent fixture, and since this one is also four tubes I expected a similar lighting effect.

But actually, this one is so much brighter than the old fixture, and the positioning of the bulbs throws light across a much wider area.

The light is quite bright and white without being too harsh. It transformed how I am able to use my garage at night.

Shipping and Handling

We ship in most cases in 1 business day or less via FedEx ground. We guarantee that every order makes it to you in perfect condition in less than 4 days in most locations in the USA.

Shipping prices valid for continental US. We also ship to Canada, Alaska, Hawaii, and U.S. Territories for an additional cost, but would need create a custom quote. Please call (512) 730-0602 or email hello@lumenright.com.


If you're not completely satisfied with your purchase, all unused items can be returned for a full refund within 90 days.

If we make a mistake or there is an issue with the product, we take care of shipping both ways.

Click here to see full return policy.

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BrightAssurance Guarantee

At Lumen Right, we want everyone to love their new lights, no exceptions. That's why we offer the BrightAssurance Guarantee.  Our guarantee is simple: if you plan your lighting project with us, we promise you will be completely satisfied.  If you are not, we will make it RIGHT!  

Project Planning Tools:

The BrightAssurance guarantee goes beyond the standard return policy. If you receive a custom lighting layout and are not absolutely thrilled, contact us and we'll do what it takes to make you a customer for life!