4 Types Of LED Tubes: Type A, Type B, Type C And Type A+B

UL Type A LED Tube

You may have heard of some people refer to LED Tubes as Type A, Type B or Type C tubes. What does that mean? And, if you’re considering upgrading your fluorescent tubes to LED tubes, or are simply thinking of replacing other LED tubes, you’ll first need to understand installation and operation of the three different types of LED tubes options: Type A LED tubes, Type B LED tubes, and Type C LED tubes.

So, what are the differences between UL Type A, B, and C tubes? why the operations and maintenance considerations should be taken in? and what kind of effect will it give to the installation cost and benefits of your projects? To get straight of it, first, let’s take an overview of the explanation issued by GE:

UL Types of LED Tubes: Type A, Type B, Type C And Type A+B

UL Types of LED Tubes: Type A, Type B, Type C, And Type A+B

As a rapidly growing lighting technology, LED linear tube options are raising questions throughout the industry — it’s important to know the options and which one will work best for you.

When considering LED Tube refits, it is important to understand the financial aspects as well as the installation, operations, and maintenance implications with three different options, which are UL Type A, UL Type B, and UL Type C.

Type A – Easiest Installation

LED Tube with Integrated Driver – Compatible and Operated on Existing LFL Ballast

Description: This UL Type A tube, is designed with an internal driver that allows the tube to operate directly from the existing linear fluorescent ballast. Most of these products are designed to work with T12, T8 and T5 ballasts.
Advantages: UL Type A offers the simplest installation process— retrofitting involves a simple swap of the existing LFL with a UL Type A LED tube. Unlike the other options, no electrical or structural modification of the existing LFL fixture is required.
Disadvantages: However, with these benefits come some limitations. The lifetime of a UL Type A solution is dependent not only on the design life of the LED tube but on the linear fluorescent ballast life, which could result in additional maintenance and costs within the lifetime of the product. Ballast compatibility will vary by manufacturer and must be checked before installation.

Additionally, a UL Type A tube sacrifices efficiency due to the additional power loss from the existing ballast and is limited in dimming and controllability.

Type B – Simplest Total System

Ballast Bypass LED Tube – Wired to Mains

Description: Like the UL Type A, this UL Type B tube operates with an internal driver. However, UL Type B’s internal driver is powered directly from the main voltage supplied to the existing LFL fixture, requiring several important and unique considerations. GE’s Type B system requires an in-line fuse. GE offers in-line fuse & socket kit, for ease of installation.

Advantages: UL Type B offers the simplest total system— retrofitting involves wiring directly to main voltage, bypassing the ballast which removes any compatibility issues, as well as eliminating maintenance costs associated with ballast replacements.

Disadvantages: Installation of a UL Type B involves electrical modification to the existing fixture in order to connect the tube to the power supply. The existing LFL and its corresponding ballast must be removed from the fixture. Sockets should be replaced. (GE requires replacing with unshunted sockets.)

UL Type B is more efficient than UL Type A, with no power loss as a result of removing the existing LFL ballast, but similarly lacks control capabilities.

It is important to note that the fixture’s incoming power wires are connected directly to the sockets, meaning installers are potentially exposed to the main’s voltage during installation. For replacement safety reasons, strict adherence to installation instructions is critical when rewiring existing fixtures and utilizing UL Type B tubes. Safe installation can be completed, but total installation time and cost will increase because of additional precautions required.

Type C – Best Performance

LED Tube with Remote Driver

Description: A UL Type C tube, offered among GE’s Refit Solutions as the LED Tube with remote driver, operates with a remote driver that powers the LED linear tube, rather than an integrated driver. Like UL Type B, UL Type C involves electrical modification to the existing fixture, but the low-voltage outputs of the driver are connected to the sockets instead of line voltage.

Advantages: Installation for UL Type C tubes involves removing existing tubes and ballasts, and it may involve replacement of existing sockets if damaged. The fixture input wires must be connected to the LED driver, and the driver’s low-voltage output wires must then be connected to the sockets before installing the new LED linear tubes. Once installed, this driver can power several LED tubes throughout the fixture.

The UL Type C offers excellent system efficacy, best system compatibility, and greatest overall performance. It can be integrated with robust dimming and control functionality, helping to offset moderate labor and installation costs with heightened efficiency well into the future.

UL Considerations

If retrofitting an existing fixture that is UL approved with a UL-approved LED tube, the fixture will remain UL approved. If retrofitting an existing fixture that is not UL approved with a UL-approved LED tube, the fixture with the LED tubes would need to be submitted to UL for approval if UL certification is necessary.

GE’s Refit Solutions will keep intact the existing fixture’s UL certification because Refit Solutions are certified by UL. GE customers must read the instructions provided with Refit Solutions prior to installation to understand the inherent risks involved in altering existing systems.

As a more controllable technology than LFL, LED lighting can be successfully integrated into facilities energy-efficiency planning. And with new LED tube options, the installation work can be done without as much hassle. GE’s Refit Solutions can provide efficient LED lighting anywhere fluorescent tubes currently exist.

So, which LED Tube option is the most cost effective and the best solution for your application? Review the table below to compare each solution.

Dollarizing Type A, B and C LED Tubes
UL TypeType A without Ballast Replacement*Type A with Ballast Replacement*Type CType B
Cost Per LED Tube$12.00$12.00$11.00$12.00
# of Tubes4444
Cost Per Driver/Ballast$11$18
Socket Kit w/Fuse
Total Fixture Retrofit Cost (4 Tubes)4 minutes10 minutes10 minutes15 minutes
Labor Cost ^ ($/hr$15.00$93.20$93.20$93.20
Total Fixtures Retrofits Cost (4 Tubes)$49.00$74.53$77.53$79.30
Key BenefitsPlug and Play: Fast and Easy refit with not wiringMinimizes compatibility issuesIncreased Efficiency Best Option for use with controlsFewer compatibility issues. Reduction of external components (driver/ballast)
Best ApplicationQuick re-lamps requiring no professional electricians and minimal investment. Ballast is less than 5 years old.Retrofits where time and simplicity are imperative. The existing ballast is older than 5 yearsRetrofits where future proofing and life-time cost and efficiencies are paramount. Applications with immediate and/or future need for controls.Retrofits using professional electricians with the ability to execute proper re-lamps in the future, ensuring only specified Type B lamps are used.
Calculations are for example only and are meant to be directionally accurate in comparing options, but are not absolute.
* Ballast replacement is recommended if the installed ballast is more than 5 years old.
^ Labor rates will vary, but less skill is required to simply replace lamps. Costs based on certified electrician estimated hourly chargesand minimum wage for Type A without ballast replacement (sources: Promatcher.com and bls.gov.)

As you can see, Type A without Ballast replacement offers an easy plug & play solution with the lowest initial cost. Type C has a higher upfront cost, but is the best future-proofing solution as it offers the ability to work with controls that are currently in place, or that are installed at a later time.

Type B is the simplest total system, eliminating compatibility issues, but also has the highest installation cost. To determine the best solution one must consider the initial installation cost, long term maintenance implications, intended application, and overall which benefits are most desired.

– Above Type A, Type B and Type C definitions of LED tubes are from GE, source: products.currentbyge.com

4 different types of LED tubes


Besides the 3 types of LED tubes, Type A, Type B, and Type C, there is also a type of hybrid LED tubes which are developed as Type A and Type B, also known as Type A+B. A Hybrid LED tube is a combination of Type “A” and Type “B” tubes.

This is a tube that can (may) work with the existing fluorescent ballast or can operate without the ballast. This is an excellent choice for those installations that want to use the fast installation method using the ballasts but have a backup plan if the ballast is not compatible. Some of the more clever designs allow the tube to be both SEP or DEP.

Following is the designation from DLC:

Type A and Type B

Dual Mode Internal Driver (UL Type A and Type B):

U-bend, Four-foot or two-foot LED “tubes” designed to replace U-bend four-foot or two-foot fluorescent lamps, respectively. Products in this category have the ability to operate off the existing fluorescent ballast and also have the ability to operate off of line voltage if the troffer is rewired to bypass the ballast. These products connect to the troffer using standard pin-base connections to the lamp holders. Note that due to testing considerations, at this time only products that can operate off specific ballasts types are eligible.

These four types of LED tubes are with advantage as well as disadvantage respectively, choosing the right products for your projects can bring you significant results.

As always, feel free to reach out if you have questions or if we can help. You can also leave your comments below for further discussion!


28 replies
  1. Leds Universe
    Leds Universe says:

    I have read your post it’s very informative and helpful too for readers .Thanks for sharing your knowledgeable content with us and keep updating us with such great informative post.Keep writing.

  2. Gary
    Gary says:

    The article text and the chart do not agree with each other. In the chart type B (far right) should be cheaper than the type C (second from the right) since it is only 4 tubes @ $12/ tube for parts (48, not 79.30 shown). Either the chart needs correction or the text does.

    • JoeyPeng
      JoeyPeng says:

      Thanks Gary. The prices are for reference only, since the tube costs vary by different materials. And if the tubes are with an exterinal driver, we should also add the driver cost in it.

  3. Gary
    Gary says:

    In the “Supplyment:” section, end of the first paragraph, are two abbreviations that do not seem to be defined elsewhere on the page. What are SEP and DEP?

    • JoeyPeng
      JoeyPeng says:

      Hi Gary,
      SEP means Single-End Power. A SEP(single-ended power) tube is a lamp that has the live and neutral pins on the same side of the lamp.
      DEP means Double-End Power. A DEP(double-ended power) tube is a lamp that has the live and neutral pins on the opposite side of each lamp.
      Hope it helps :)

      • Juliet
        Juliet says:

        Which type of bulb is more likely to be “future-proofed:” single-ended power or double-ended power? Which of the the UL Types A, B and C are SEP and which are DEP?

        • JoeyPeng
          JoeyPeng says:

          Hi Juliet,

          It depends on your projects, if you’re retrofitting an existing fixture, then Type A will be better(Compatible on existing LFL ballast). If you’re building a new fixture, then Type B will be fine, it offers the simplest total system. Whether it’s SEP or DEP depends on the tube design, you can also refer to the following typical LED tube wiring diagram. Typical LED Tube Wiring Diagram

  4. Taylor Bishop
    Taylor Bishop says:

    I wanted to thank you for helping me learn more about LED types. It’s interesting that a fixture that is not UL approved would need to get a UL certification if it has UL-approved LED tubes. I’m interested to learn if the whole fixture is cent in or id someone needs to look at it in person.

  5. Eileen Benson
    Eileen Benson says:

    It was interesting when you explained that types A and B are connected to the troffer through connections that are pin-based. My brother wants to have new LED lighting fixtures installed in the office building he owns. The info you shared here should help him choose the right types of fixtures to have installed!

  6. apetube
    apetube says:

    Type A lamps are a good solution in many applications because of the increased ability to control the light via ballast factor.This is currently the only LED T8 lamp system that is capable of matching a T8 system operating on a high ballast factor.

  7. FEITQuestion
    FEITQuestion says:

    Thanks for the wonderful article, I Have a quick question. Without knowing the details I purchased a FEIT Type A Plug and Play Tubes, is it possible to bypass the ballast and use type A as a retrofit?

    • JoeyPeng
      JoeyPeng says:

      It’s possible to bypass the ballast and use Type A as a retrofit, But, you may need to do the rewiring on the existing fixture because it’s wired with ballast already. If you bypass the ballast, the wiring should be modified.

  8. Michale Rock
    Michale Rock says:

    Does anyone have any information on where to buy UL type C LED T8 48” tubes? After 2 failed ballasts I have done some research on eliminating the ballast and type C appears to be a good solution. However, type C tubes and the LED driver don’t seem to be available at my local hardware store. Is there a reason type C tubes don’t seem to be available? Have they been phased out. Are any reputable manufactures still making them? I would hate to implement type C only to find out the tubes and/or the LED drivers are not available in the near future. Thanks so much.

  9. Rick Schuett
    Rick Schuett says:

    Type C lamps and LED drivers are considered to be “professional grade and are normally sold through electrical distributors and sold to electrical contractors, which is why you don’t see them at a typical DIY store.

  10. Rebecca Gardner
    Rebecca Gardner says:

    Thanks for explaining that Type A LED tubes are easy to install since the existing structures usually don’t have to be modified. My brother is looking to hire a commercial electrician to upgrade the overhead lighting in the small retail building he purchased earlier this month. I know LED lighting is popular in commercial spaces, so I think this info about the types of LED tubes would be helpful at this early stage in his project!

  11. David Hutchison
    David Hutchison says:

    Is it possible to dim a Type B LED without a dimming ballast and using only a recommended dimmer switch?

    • JoeyPeng
      JoeyPeng says:

      Hi David,
      First, you need to make sure this Type B tube you have is dimmable. And then check what kind of the dimmer switch is, to make sure it’s compatible with the tube. It is always safest to purchase one or two Type B tubes and test those with the existing dimmer switch first.

  12. LED Manufacturer
    LED Manufacturer says:

    I strongly appreciate this blog!. Everything is clear to me now, thank you also for the reminders and tips here, this is a great article. Very informative and is worth to read.

  13. Access Doors and Panels
    Access Doors and Panels says:

    Thank you for giving us a direct and straight to the point answer! It greatly helped in clearing our confusion.

  14. Taylor Hicken
    Taylor Hicken says:

    I liked it when you shared that it is important to choose the right LED light for your projects so you are able to receive significant results. My father just mentioned the other day that he is planning to improve the lighting system in our house so it will help in reducing the electricity bills. I will suggest to him getting the right type of LED lighting from a reliable supplier.

  15. Kristofer Van Wagner
    Kristofer Van Wagner says:

    I am grateful that this post highlighted that when looking for LED light bar, it is important that we consider their quality. It makes sense as in doing so, we can be certain that it is made of quality. I will look for a trusted seller to get my needs sorted.

  16. John amerise
    John amerise says:

    Aliddra lighting has a 4 pin cfl replacement plug-in fixture led type a+b, is it
    Ballast is not more than 5 years old building.
    20 fixtures in ceiling must be dimmable for an art gallery.
    Hope you can help thank you
    John Amerise

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