Save 10% SITEWIDE use code SUPERBRIGHT21
store image

18W 4ft LED T8 Tube - NSF Shatterproof 3-in-1 Universal - Ballast Compatible Type A - Ballast Bypass Type B Single/Dual-End - 2300 Lumens - 4000K/5000K

Part Number: T8U4-xK18-PFN


  • Shatterproof PET coating
  • 3-in-1 Universal Design - Simplifies installs & stocking
  • Type-A Ballast Compatible
  • Type-B Ballast Bypass (Single and Dual-End Wiring)
  • ETL Listed in compliance with NSF Standard 2
  • Suitable for dry and damp locations
Select Color Options:
Cool 5000K
Natural 4000K
Select Pack:
In Stock
Starting at $6.95 ea. (per Bulb)
Volume price as low as $6.12
Orders ship on or before  Monday 11/29/2021
  • Select options to see various notes.
Utility Rebate Finder


The 18W T8 Universal 3-in-1 Shatterproof NSF LED Tube is the ideal replacement for fluorescent 4ft T8/T12 lamps for installers and end-users alike. The ability to convert from Type A to Type B at any point of the lamps life, make this the customer-friendly solution for those wanting the simplicity of Type A plug & play, but also needing to be prepared for the unexpected ballast failure. ETL listed to NSF Standard 2 requirements, mercury-free for safe and easy disposal, and shatter-resistant glass coating make it a perfect solution for food processing, schools, hospitals, grocery and retail stores. These 3-in-1 tubes have a 50,000 hour lifespan and consume less power than conventional fluorescent (LFL) lighting.

Product Details:
  • Replacement for 4 foot 32W T8 linear fluorescent lamps
  • G13 bi-pin electrical connection
  • 120-277 VAC
  • Compatible with shunted and non-shunted lamp holders
  • Includes re-lamping label for maintaining fixture UL compliance
  • Suitable for open and enclosed fixtures
  • 50,000 hour (L70) lifespan
  • 2,300 Lumens, 130 lm/W Efficacy
  • 220° Beam Angle
  • UL Listed, UL Classified under UL standard 1598C for retrofit
  • DLC Listed 5.0 Standard
  • ETL Sanitation Listed
  • 5 Year Warranty
5 Years
Super Bright LEDs, Inc. offers a 5-year warranty to protect against manufacturer defects and malfunctions. If you experience failure of an LED or other component not caused by negligence, abuse, unauthorized repair or disassembly, we will replace the product within the warranty period. If the same product is no longer available, a product of equal value may be substituted. Read More
ETL NSF Std. 2
The DesignLights Consortium® (DLC®) partners with energy-efficiency groups and utility companies to establish a set of standards for commercial LED light fixtures. The product is tested and must meet quality, energy-efficiency, and performance requirements to be added to the DLC's Qualified Products List. For more information, click here. To view all of our DLC® listed products, click here
UL Listed
Underwriters Laboratories (UL) LLC is an independent testing agency that works to verify product safety and quality. A UL-Listed label means that product samples have been tested by UL and that the product meets their Standards for Safety requirements.
UL Classified
Underwriters Laboratories (UL) LLC is an independent testing agency that works to verify product safety and quality. UL tests specific properties of product samples to ensure that they adhere to applicable UL requirements, Standards for Safety, and other national and international organization's standards.
  • Hospitality
  • Healthcare
  • Food Processing
  • Schools
  • Offices
  • Retail
  • Commercial Complexes
  • Industrial Facilities

T8U4-xK18-PFN Supported Electrical Configurations

Connection Types

3-in-1 LED Tube Lights support both single and dual end wiring configurations. The wiring configurations to the tube ends will be dependent on your fixtures ballast configuration. Single ended wiring may require tombstone shunting.

Single Ended

Electrically connected from one end of the tube, one pin connecting to line and one to neutral. This type requires non-shunted sockets and rewiring

Dual Ended

Electrically connected on both ends of the tube, with one end connecting to line and one to neutral. This type can use shunted or non-shunted sockets. As with the original bulbs these are replacing, one end of the tube connects to L and the opposite end to N—one end should not be connected to both.

Ballast Compatibility

This is the most universal tube lamp solution. “Plug and Play” install if using the existing ballast, or bypass the ballast and install in the same manner as Single-End or Dual-End Type B.

How To Wire Dual-End Type A:
How To Wire Single-End Type B:
How To Wire Dual-End Type B:

Socket Wiring

In instances where you want to wire a tube light from a single end you will need to have a tombstone which is either interally or externally shunted. Typical dual end tube installations will not require shunted sockets. Type A and Type B Dual-End installations should work with most unmodified sockets making shunting configuration irrelevant.

Shunted (Type A Dual-End, Type B Dual-End)

Both contacts in the same socket (tombstone) are connected/bridged and are the same polarity—either L or N.

Non-Shunted (Type A Dual-End, Type B Single & Dual-End)

Contacts in the same socket (tombstone) are split, but can be either the same polarity or opposing polarity depending on the way the socket (tombstone) is wired. A non-shunted socket is required for single end Type B installations.

Determining Shunted or Non-Shunted

Below are some typical examples of how shunted or non-shunted sockets might look. You should always check the socket terminals with a multimeter before installing bulbs or rewiring. If the two sides of a socket have continuity, then the socket is shunted regardless of appearance.

Need To Wire Differently?

LED tubes lights can be wired with or without ballast, and from either end depending on the tube type.


Swipe left to see additional specifications
Part NOPriceProduct WeightConstant Current
Light Distribution
BUG Rating
Beam Pattern
EquivalencyElectrical ConnectionMax Run
T8U4-xK18-PFN - 18W 4ft LED T8 Tube - NSF Shatterproof 3-in-1 Universal - Ballast Compatible Type A - Ballast Bypass Typ
18W 4ft LED T8 Tube - NSF Shatterproof 3-in-1 Universal - Ballast Compatible Type A - Ballast Bypass Type B Single/Dual-End - 2300 Lumens - 4000K/5000K



Overall Rating

Total Reviews


Tell Us What You Think

Share your own experience and photos of this product. Doing so will help inform other potential buyers and allow us improve our product lines. It may take up to 72 hours for your review to appear.

Sign In Required to Write a Review
Click here to sign in to your account
Technical Level
Part Number
Reviewed On

Great Bulbs my garage was never so bright. Did the Ballast Bypass mod, will be ordering more. You can never have too much light in the Garage.

Helpful? Yes (0) No (0)

Response from Super Bright LEDs:

Thank you for the great review!

Send us your Feedback