store image

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:
In Stock
Starting at $6.95 ea. (per Bulb)
Volume price as low as $6.26
Orders ship on or before  Friday 09/17/2021
  • Select options to see various notes.
Utility Rebate Finder


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

Why Switch To

LED T8 Tube Lights

Energy Savings

It's difficult for property managers to realize the potential savings LED tubes have over their conventional fluorescent tube counterpart when just looking at a singular lamp’s specifications. Proper calculations require looking at fluorescent bulb wattage and the ballast factor to determine a true operational wattage. Then multiply that by the amount of bulbs per fixture and how many of those fixtures the facility is equipped with along with standard operation time. Fluorescent lamps generally get installed in places that require 24/7 operation time. This is over $5,000 in energy savings a year for a facility with 100 fluorescent fixtures with standard fluorescent to LED tube relamping specifications.

Reduced Maintenance Cost

One of the greatest benefits from LED lighting conversions of linear fluorescent lamp systems is the savings that can be achieved due to reduced maintenance costs with LEDs. Typical linear fluorescent fixtures require constant maintenance, inventory and records of all components; including the bulbs themselves, ballasts, and starters. LEDs are versatile in their dependency with that existing system allowing them to operate as “Plug and Play” with an existing ballast or with direct line bypassing a bad ballast. Combine that versatility with a minimum L70 lifetime of 50,000 hours and you will see quickly that the near zero maintenance could be the greatest benefit of all.

Rebate Incentives

Linear fluorescent lighting is one of the most consistently available retrofit rebate incentives offered from most all power utility companies for commercial and residential users. Most all LED tubes are listed under specific categories of DLC to help guide the end users and the utility companies to the most applicable product for their applications. The average rebate incentive for fluorescent lighting conversions to LED can cover up to 80% of the upfront cost of the light itself.

Key Technical Considerations

Connection Types

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

Ballast In-Line

Dual-End Type A installation is “Plug and Play” and simply replaces the original fluorescent tube with an LED equivalent, requiring the use of the original ballast. This is the easiest solution to relamping your fixture if you have already determined your ballast is functioning properly.

Ballast Bypassed

Single-End Type B installation requires bypassing the original ballast and rewiring sockets (tombstones) in the fixture. This is a popular solution when relamping, due to the likelihood of an eventual ballast failure.

Socket Wiring


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


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.

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.

Types Of T8 Tubes


Type A Dual-End

Installation is “Plug and Play” and simply replaces the original fluorescent tube with an LED equivalent, requiring the use of the original ballast.

  • Plug and Play
  • Dual-End wiring
  • Requires compatible ballast
  • Shunted or non-shunted sockets
Shop Type A Dual-End

Type B Single-End

Installation requires bypassing the original ballast and rewiring sockets (tombstones) in the fixture. This is a popular solution when relamping, due to the likelihood of an eventual ballast failure.

  • Single-End wiring
  • Requires bypassing the ballast
  • Non-shunted sockets only
Shop Type B Single-End

Type B Dual-End

Installation simply involves bypassing the existing ballast and installing the tube with polarity matching the wiring.

  • Dual-End wiring
  • Requires bypassing the ballast
  • Shunted or non-shunted sockets
Shop Type B Dual-End

Type A/B Hybrid

This can be installed in the same manner as a dual-end Type A (“plug and play” tube simply replaces the original fluorescent tube) or a single-end Type B (requires bypassing the original ballast and rewiring sockets).

  • Can be used with or without ballast
  • Ballast bypass (Single-End wiring)
  • Shunted or non-shunted sockets (Type A), non-shunted sockets (Type B)
Shop Type A/B Hybrid

Type A/B 3-in-1 Universal

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.

  • Can be used with or without ballast
  • Ballast bypass (Single and Dual-End wiring)
  • Shunted or non-shunted sockets (Type A or Dual-End Type B)
  • Non-shunted (Single-End Type B)
Shop Type A/B 3-in-1 Universal


Swipe left to see additional specifications
Part NOColor TemperatureLED QuantityLED Wattage
Intensity per LEDMilliwatt
CCT / Wavelength
Price Ea.Product WeightLumen Per Dollar
T8U4-40K18-AFNNatural 4000K ----4000 $6.95-330.94 lumen/dollar
T8U4-50K18-AFNCool 5000K ----5000 $6.95-330.94 lumen/dollar
T8U4-40K18-AFN-4PKNatural 4000K ----4000 $27.60-333.33 lumen/dollar
T8U4-40K18-AFN-25PKNatural 4000K ----4000 $169.95-338.33 lumen/dollar
T8U4-40K18-AFN-50PKNatural 4000K ----4000 $329.95-348.54 lumen/dollar
T8U4-50K18-AFN-4PKCool 5000K ----5000 $27.60-333.33 lumen/dollar
T8U4-50K18-AFN-25PKCool 5000K ----5000 $169.95-338.33 lumen/dollar
T8U4-50K18-AFN-50PKCool 5000K ----5000 $329.95-348.54 lumen/dollar


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, 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 (6) 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 (5) No (0)

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 (4) 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

Sturdy construction, super bright, as advertised.

Helpful? Yes (1) No (0)

Send us your Feedback