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18W T8 Hybrid LED Tube - 2,070 Lumens - 4ft - Ballast Compatible/Single End Ballast Bypass Type A/B - 32W Equivalent - 5000K/4000K/3500K

Part Number: T8AB-xK18S-GF


  • Replaces 4' F32T8 fluorescent tubes
  • Plug-and-play/ballast-bypass type A/B
  • Mercury-free, instant-on
  • UL and DLC Listed
  • 5-Year warranty
Select LED Color:
Cool 5000K
Natural 4000K
Warm 3500K
Select Pack:
Various Options In Stock
Starting at $8.95 ea. (per Bulb)
Volume price as low as $7.65
Orders Ship Today!  1 Hour and 22 Minutes remaining
  • Select options to see various notes.
Utility Rebate Finder


These Hybrid LED T8 tubes are the long-lasting alternatives to F32T8 fluorescent tube lights. The 4' ballast-compatible/ballast-bypass tube light bulb can be used in direct-wire fluorescent fixtures or to replace T8 tubes in ballasted fixtures. It emits 2,070 lumens of cool, natural, or warm white illumination. Unlike fluorescent lights, this LED T8 tube turns on instantly—even in cold weather—and is simple to dispose of because it contains no harmful mercury. The single-ended LED light uses just 18 watts of power—significantly less than the 32 watts of an equivalent fluorescent tube light. With a life expectancy 5 times as long as fluorescent tubes, the LED T8 tube reduces costly repairs, disposal fees, and the need for replacements. Price per bulb, 4-pack, 25-pack, or 50-pack. It's perfect for basements, offices, schools, hospitals, factories, and more.

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.
  • 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
T8AB-35K18S-GFWarm 3500K----3500 $8.95-231.28 lumen/dollar
T8AB-40K18S-GFNatural 4000K----4000 (Discontinued)-231.28 lumen/dollar
T8AB-50K18S-GFCool 5000K----5000 (Discontinued)-231.28 lumen/dollar
T8AB-35K18S-GF-4PKWarm 3500K----3500 $35.60-232.58 lumen/dollar
T8AB-35K18S-GF-25PKWarm 3500K----3500 $217.95-237.44 lumen/dollar
T8AB-40K18S-GF-4PKNatural 4000K----4000 (Discontinued)-232.58 lumen/dollar
T8AB-40K18S-GF-25PKNatural 4000K----4000 (Discontinued)-237.44 lumen/dollar
T8AB-50K18S-GF-4PKCool 5000K----5000 (Discontinued)-232.58 lumen/dollar
T8AB-50K18S-GF-25PKCool 5000K----5000 (Discontinued)-237.44 lumen/dollar
T8AB-40K18S-GF-50PKNatural 4000K----4000 (Discontinued)-243.56 lumen/dollar
T8AB-35K18S-GF-50PKWarm 3500K----3500 $424.95-243.56 lumen/dollar
T8AB-50K18S-GF-50PKCool 5000K----5000 (Discontinued)-243.56 lumen/dollar
T8AB-xK18S-GF - DLC Listed T8 LED Tube - 32W Equivalent - Ballast Bypass/Ballast Compatible F32T8 Type A/B - 2070 Lumens
DLC Listed T8 LED Tube - 32W Equivalent - Ballast Bypass/Ballast Compatible F32T8 Type A/B - 2070 Lumens


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Happy with lights so far.

Very happy with purchase. I bought the 3500k bulbs, which were perfect for some of the rooms, but I wish I would have got the 4000 too, but that's on me...
Bypassing the ballast was easy, took 15 minutes per fixture. I'll buy more as needed.

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I am very pleased so far. It was easy to modify my old fixtures to work with the new bulbs. I just cut out the ooold ballasts and directly connected the new bulb fixtures. What do I do with the old , probably PCB containing, ballasts?

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Wonderful bright warm light. Recommend the 3500K

I purchased the 3500K version, which has a bright but warmer tone than the others. Why anyone would want the harsher (bluer) 5000K tone is beyond me. The 3500K color temperature is fine for living spaces and just what you want. In fact, I wish I could have found a warmer light such as 3000L or even 2700K. Thank you SBL for offering these.

Watch out for a gotcha. It says "ballast compatible" but this is only if you have an electronic ballast, not the magnetic type common in older fixtures. In any case, because these lamps can be used by direct wiring by removing the ballast entirely, you can not go wrong. If you have to rewire the fixtures to accommodate direct wiring, BE SURE you cut all wires directly from the sockets on the non-powered ends. There may be connections between them. Make sure you cut the wires where they come out of the sockets themselves.

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good long lasting bulb

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I hope LED's live up to the hype

Purchased 150 light tubes over 4 months and all but one worked. Current draw is half of the T8 florescents they replaced. They seem brighter even though the rated light output is slightly less than Florescent tubes. I do need to do more research but I do know that LED's are capable of putting out a pure frequency of light. Whereas the light coming from incandescent or florescent is a frequency band. a narrow band but a band and not a pure frequency of light. This may explain why they appear brighter. My hope is to get the 30,000+ hours of operation. That would put it out to 20+ years before they need changed.

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