Topaz Lighting LED T8 Frosted ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$21.03
Topaz Lighting LED T8 Frosted U-Tube Bypass Lamp, 4000K, 15.5W, 120-277V

Topaz Lighting LED T8 Frosted U-Tube Bypass Lamp, 4000K, 15.5W, 120-277V

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Model: L4T8B/U6/840/15F-70

In Stock (leaves warehouse same day if ordered before 3pm ET)

$21.03
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Topaz Lighting LED T8 Frosted U-Tube Bypass Lamp, 4000K, 15.5W, 120-277V

The Topaz Lighting LED T8 Frosted U-Tube Bypass Lamp is a high-performance direct replacement solution engineered for commercial lighting applications. Delivering 15.5W of energy-efficient illumination at a crisp 4000K color temperature, this single-ended U-bend LED T8 lamp operates on a wide voltage range of 120-277VAC, making it compatible with a broad range of commercial fixtures. Featuring an advanced optical design with a frosted lens, it provides a glare-free, seamless end-to-end 160° light-emitting area and offers up to 40% energy savings over fluorescent technology with 2X the rated lifespan at 50,000 hours.

Key Features

  • Lamp Type: 15.5W single-ended U-bend LED T8 designed as a direct replacement and bypass for standard fluorescent U-tube fixtures.
  • Color Temperature: 4000K neutral white light delivers a crisp, professional-grade illumination ideal for commercial environments.
  • Wide Voltage Compatibility: Operates on 120-277VAC, providing flexibility across a wide range of commercial electrical systems.
  • Advanced Optical Design: Frosted lens produces a glare-free, seamless 160° end-to-end light-emitting area for uniform, comfortable illumination.
  • Energy Efficiency: Offers up to 40% energy savings compared to traditional fluorescent U-tube technology, reducing operating costs.
  • Extended Lifespan: Rated at 50,000 hours — 2X the life of comparable fluorescent lamps — minimizing maintenance and replacement frequency.
  • Bypass Design: Direct-wire bypass configuration eliminates the ballast from the circuit, improving reliability and reducing points of failure.

Technical Specifications

  • list_batch: TOPAZ-20260727

Typical Applications

  • Commercial Office and Retail Lighting Retrofits
  • Schools, Classrooms, and Educational Facilities
  • Warehouses and Industrial Facilities
  • Healthcare and Institutional Environments
  • Fluorescent-to-LED Upgrade and Energy Efficiency Projects
  • Renovation and New Construction Commercial Installations

Why Topaz Lighting?

Topaz Lighting's LED T8 U-Tube Bypass Lamp is built to deliver reliable, long-lasting performance in demanding commercial environments. With a 50,000-hour life rating, up to 40% energy savings, and a wide 120-277VAC operating range, this lamp is engineered to meet the needs of professional electrical contractors and facility managers. The advanced frosted optical design and bypass configuration ensure consistent, code-compliant performance across a wide range of commercial retrofit and new construction applications.

Product Specs

Product Type:
LED Lamp
Product Wattage:
15.5W
Light Temperature:
4000K
Conduit Type:
T8 U-Bend
Department:
Electrical
Product Group:
Lighting
Product Subgroup:
LED Lamps & Bulbs
Product Color:
Frosted

Topaz Lighting L4T8B/U6/840/15F-70 – Frequently Asked Questions

1) Do I have to remove the ballast to install the Topaz L4T8B/U6/840/15F-70 U-tube LED?
Yes. This is a bypass (direct-wire) lamp, so the existing fluorescent ballast comes out of the circuit and line voltage is wired straight to the sockets. It's single-ended, meaning line and neutral land on one end of the lamp. That's an electrician's job, not a lamp swap, so budget the labor when you're pricing a retrofit across a building.
2) Can I install this lamp without rewiring, as a plug-and-play over the existing ballast?
No. This is a bypass lamp only, so it will not operate on an existing fluorescent ballast. If you need a lamp that runs on the ballast already in the fixture, you want a ballast-compatible (Type A) U-tube instead. Attempting to install a bypass lamp in an un-rewired fixture will not light it.
3) Can I use the same Topaz U-tube lamp on both 120V and 277V circuits in my building?
Yes. The lamp runs on 120-277VAC, so one part number covers 120V office circuits and 277V commercial lighting panels. For a property manager or MRO buyer standardizing stock, that means a single SKU on the shelf instead of voltage-specific versions.
4) Is 4000K the right color for an office or classroom retrofit?
4000K is neutral white, the most common choice for offices, classrooms, and retail because it reads clean without the blue cast of 5000K. If you are mixing this into a space that already has 3500K or 5000K lamps, the difference will be visible, so re-lamp a whole room or zone at a time rather than one fixture.
5) What wattage does this replace, and how much energy will I actually save?
The lamp draws 15.5W and Topaz rates it at up to 40% energy savings versus the fluorescent U-tube technology it replaces. Combined with the ballast being removed from the circuit, there's no ballast loss on top of the lamp draw either.
6) What do I order to get this exact Topaz lamp?
Order Topaz part number L4T8B/U6/840/15F-70. Reading the code: L4T8B is the LED 4-foot-class T8 bypass lamp, U6 is the 6-inch U-bend leg spacing designation, 840 is 80 CRI at 4000K, and 15F is the 15.5W frosted version. There is one configuration, so there are no finish or voltage options to specify.
7) Will a frosted lens cut the glare complaints we get in open-plan offices?
The frosted lens spreads output over a seamless 160 degree end-to-end emitting area rather than showing individual diodes, which is what makes clear-lens LED tubes look harsh in an open ceiling. In a lensed or louvered troffer you may not notice the difference; in an open strip or a fixture where the lamp is visible, frosted is the one to specify.
8) How long before I have to re-lamp these again?
Rated life is 50,000 hours, which Topaz states is twice the life of comparable fluorescent U-tubes. On a 12-hour-a-day school or office schedule that's roughly a decade between lamp changes, which is the real argument for the retrofit on a maintenance budget rather than an energy one.
How fast can I get the Topaz Lighting L4T8B/U6/840/15F-70 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Topaz Lighting L4T8B/U6/840/15F-70 come with a warranty?
Absolutely. The Topaz Lighting L4T8B/U6/840/15F-70 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Topaz Lighting L4T8B/U6/840/15F-70?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Topaz Lighting L4T8B/U6/840/15F-70 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
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