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18W T8 Universal 3-in-1 LED Tube - 2300 Lumens - 4ft - Single End/Dual End - Ballast Compatible/Ballast Bypass Type A/B - 32W Equivalent - 5000K/4000K

Part Number: T8U4-xK18-AFN


  • Versatile retrofit capabilities
  • Plug and play Type A - dual ended
  • Bypass ballast for Type B - single or dual ended
  • Replaces 4' 32-watt T8 fluorescent tubes
  • 120–277 VAC
  • DLC Standard, 5 year warranty
Select Color Options:
Cool 5000K
Natural 4000K
Select Pack:
Out of Stock Backorder Available
Starting at $6.95 ea. (per Bulb)
Volume price as low as $6.26
Orders ship on or before  Monday 05/23/2022
  • Select options to see various notes.
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Update nearly any 4’ fluorescent fixture with the universal 3-in-1 design of T8U4 series T8 LED Tube. Simply plug-and-play with Type A compatibility, or bypass the ballast for Type B luminaires. Conveniently replace 32-watt fluorescent tubes according to the existing system, with nearly half the wattage. The frosted glass lens distributes diffused, efficient task light for offices, schools, or any other commercial setting.

Product Details:
  • Single or dual ended, G13 bi-pin base
  • May not be compatible with all ballasts
  • Type A runs 20.5-watts, Type B runs 18-watts
  • Available in 5000K, 4000K
  • 120-277 VAC input
  • 50000 hours L70 lifespan
  • DLC Standard, UL Listed, UL Classified
  • 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
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.
  • Factories
  • Hospitals
  • Schools
  • Offices
  • Commercial Complexes
  • Industrial Facilities

T8U4-xK18-AFN 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 NOColor Temperature
LED QuantityLED Wattage
Intensity per LEDMilliwatt
CCT / Wavelength
Price Ea.Product WeightLumen Per Dollar
-T8U4-40K18-AFNNatural 4000K ----4000 K$6.95-330.94 lumen/dollar
-T8U4-50K18-AFNCool 5000K ----5000 K$6.95-330.94 lumen/dollar
-T8U4-40K18-AFN-4PKNatural 4000K ----4000 K$25.95-333.33 lumen/dollar
-T8U4-40K18-AFN-25PKNatural 4000K ----4000 K$164.95-338.33 lumen/dollar
-T8U4-40K18-AFN-50PKNatural 4000K ----4000 K$329.95-348.54 lumen/dollar
-T8U4-50K18-AFN-4PKCool 5000K ----5000 K$25.95-333.33 lumen/dollar
-T8U4-50K18-AFN-25PKCool 5000K ----5000 K$164.95-338.33 lumen/dollar
-T8U4-50K18-AFN-50PKCool 5000K ----5000 K$329.95-348.54 lumen/dollar


Overall Rating

Total Reviews


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Technical Level
Part Number
Reviewed On

Why such a big label?

Nice and bright, and I would have gladly given more stars, but I wish the "superbright" label could have been a smaller. It darkens the last 2" of the tube and with a 48" tube, that's a significant percentage. So we unnecessarily give back a chunk of what we gained by changing to LED in the first place. There should have been a better solution, like a longer label on the top, where it doesn't block any light.
I tried to peel it off, BTW, but the glue doesn't allow a clean removal.

Helpful? Yes (9) No (1)

Technical Level
Part Number
Reviewed On

Great bulbs, very easy wiring job.

I purchased two of these that in a florescent fixture that had a new ballast put in but failed again in less than 48 hours. I did the single side installation, and removed the old ballast and one side of the wiring, paying attention to the line and neutral sides.

When wiring be aware these bulbs do have an up and down. The light evenly fills 360 degrees but there is a darker line, that should be facing up when installing so even light points down.

I am now considering more of these LED bulbs to replace the lights in our garage.

Helpful? Yes (7) No (0)

Technical Level
Part Number
Reviewed On

Did not work with ballast

Description said that this bulb would work with ballast. This was not the case. Had to remove ballast and rewire fixture. Otherwise, works well. Replace 8 fluorescents with 4 LED tubes.

Helpful? Yes (6) No (0)

Technical Level
Part Number
Reviewed On

very easy to install

converted 11 fixtures (22 bulbs) over to these. easy and they work great! T8 fluorescent bulbs had started to go orange and dim after only 4.5 years. these fixed the problem.

Helpful? Yes (2) No (0)

Technical Level
Part Number
Reviewed On

Great LED Tubes

I converted 3 fluorescent fixtures by eliminating the ballasts and wiring the tombstones directly. I installed these LED Tubes and they worked great. The light they give off is just right for our laundry room. Would purchase again! Thank you!

Helpful? Yes (1) No (0)

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