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How to Buy: T8 and T12 LED Fluorescent Replacement Tubes

Posted by EarthLED News on

Choosing the right LED fluorescent replacement tubes can be confusing due to the myriad of product types and installation options. We at have created this guide to assist in the process and help you make the right choice for your specific projects.

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What are LED Fluorescent Replacement Tubes?

 The consumer demand for quality LED replacement products fueled recent industry changes, beginning with the introduction of proper safety and light output standards. Much of this development was due to building and facility managers looking for a way to replace problematic fluorescent tubes with a long-life solution. An additional impetus for development was also the phase out of T12 ballast technology, which led many to look for a solution that would allow for the re-use of existing fixtures without costly conversions to different technologies.LED fluorescent replacement tubes allow for replacing linear fluorescent tubes, (commonly referred to as T8/T10/T12), with LED technology. The first products came to market around 2007; however, early generation LED fluorescent replacement tubes not only lacked adequate light output, safety certifications were often non-existent. The lack of quality found in these early replacement solutions unfortunately gave initial buyers a bad impression of LED fluorescent replacement technology. 

Today, LED fluorescent replacement tubes are truly able to offer a one-for-one replacement, and have recently reached price levels that offer payback periods well under 12 months. As a result, commercial and residential customers alike have become very interested in the technology, but many are often discouraged by the sheer number of options both in products and installation methods.

How Do I Choose the Right LED Fluorescent Tube Replacement Option For Me?

The first and most important step in choosing which product is right for you is to decide on the installation method you would like to use. The installation method will largely vary on what type of existing fixture technology you have-- either T8 or T12.

To figure out what you currently have installed, it is best to remove a bulb from the fixture and read the markings on the end. This will reveal a lot about your current fluorescent tube and usually indicate if the bulb is T8 or T12.

If no markings are available, the size in diameter of the tube is the easiest way to determine the type you have installed.


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T8 tubes are 1-inch in diameter and T12 tubes are 1 1/2 -inch. If you have a tube that is very small in diameter (5/8 inch) you have a T5,and thus the remainder of this discussion will not be of use in terms of helping retrofit this application.

Now that you know what type of tubes you have, the next key is to understand the type of ballast. In general, T8 use electronic ballasts while T12 use magnetic ballasts. Opening the fixture and examining the ballast will give you the ultimate answer as to what type of ballast you have; but, in general, the older the fixture, the more likely it is to have a magnetic ballast.

With the ballast and tube type considerations out of the way, let’s discuss the various replacement options.

Currently, there are four types of options available in the market:

Ballast Bypass or Direct Wire LED Fluorescent Replacement Tubes

The oldest but also least expensive and most widely installed option is the ballast bypass or direct wire LED fluorescent replacement tube. Instead of building expensive circuitry inside to enable the function with a ballast, this option instead allows the user to bypass the ballast entirely and run directly off of the line voltage at the installation.

Due to potential safety hazards of interacting with line voltage, (which can be as high as 277V in commercial applications), safety testing organizations such as UL have introduced standards to ensure that this product can be installed safely. The result is that most products in this category have to be installed with the line voltage input into one side of the tube.

Non-Shunted Rapid Start Tombstones

Non-Shunted Rapid Start Tombstones like this are needed.

This introduces a unique requirement in that the sockets must be of the T12 or "Non-Shunted Rapid Start" type. If you have a T12 fixture, you are in luck, as you have all the necessary hardware already. T8 fixtures must have the input side sockets changed to T12 sockets of the "Non-Shunted Rapid Start" type, as T8 sockets have a circular conductor that will not allow them to properly separate the line and the neutral sides of the circuit. 

An example of the wiring for such an installation can be found here.

In this video created by our customer Jeff T, he will explain how to rewire your fixture to accept LED ballast bypass tube lights. 



While the wiring is actually quite simple and can be performed in minutes per fixture, it is usually recommended, or in the cases of commercial properties required that an electrician perform this task. 

Despite the more complex installation requirements, ballast bypass tubes have large advantages in that their unit cost is lowest versus all other options--an important consideration in the case of a very large project where every dollar counts. For users with T12 fixtures, they offer a compelling option as well due to the necessary socket hardware already being in place. 

Shop Ballast Bypass LED Tubes

T8 Electronic Ballast Compatible LED Fluorescent Replacement Tubes

A relatively new option is the electronic ballast compatible LED fluorescent replacement tubes. As their name might suggest, they are meant to work with electronic ballast installations and therefore will not function with magnetic ballasts nor will they function without ballasts. Industry data suggest that this combination alone accounts for over 1.2 billion tube lights, thus they are perpetually growing in popularity. 

Like the universal tube technology described below, installation is as simple as pulling out the old tube and swapping the LED tube in its place. Due to the enormous variety of electronic ballasts on the market, many manufacturers have actually done compatibility testing and have developed a full list of compatible ballasts that their LED tubes will work with.

The downsides to this option are once again a higher per unit upfront cost, alongside the continued worry that if the ballast fails the LED tube will not illuminate. Individuals and organizations have to weigh these potential pitfalls against the ease of installation and lack of downtime. 

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Hybrid (T8 Electronic Ballast Compatible /  T8 or T12 Ballast Bypass LED) Fluorescent Replacement Tubes

Some manufacturers have recognized the opportunity to provide LED tube lights that work with Electronic Ballasts (T8) or have the ability to bypass ballasts when the ballast no longer works. This has given rise to a new category, the hybrid tube light. Hybrid tubes work with T8 electronic ballasts but can also be wired directly like a ballast bypass tube light should the ballast fail or if a facility has a mixed environment with T8 and T12 that require both wiring types. This is an advantage for mixed type facilities because the same tube light can be used with a quicker implementation time. Hybrid tubes also allow for the tube light to quickly bypass the ballast if the ballast fails due to their dual operating nature. The primary downside to hybrid tubes are their higher cost and in some cases lower efficiency versus ballast bypass options.

Shop hybrid ballast compatible LED Tube Lights

Universal (T8 Electronic or T12 Magnetic) Ballast Compatible LED Fluorescent Replacement Tubes

The newest, most costly but also easiest to install, these LED tubes will literally work with any type of existing technology-- be it T8 (Electronic Ballast) or T12 (Magnetic Ballast). The install is as simple as taking out the old fluorescent tube and installing the LED tube. These are a great choice for a homeowner or smaller facilities where the primary goal is total power reduction and no downtime for installation.

The major downside of these options is the up front per unit costs, which can be among the highest. Additionally, since the ballast is still in place it is still a maintenance concern. This is especially critical in T12 magnetic applications where new ballasts can no longer be procured.

Shop Universal Ballast Compatible T8 & T12 LED Tube LIghts

We Know LED Fluorescent Replacement Tubes.

We hope this article has served to demystify the basics of choosing an appropriate LED fluorescent tube replacement solution.  You can count on to always carry the best selection of all options available on the market from leading and reliable manufacturers at the best price. Feel free to contact us with any questions you may have when it comes to your next LED fluorescent tube replacement project.

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  • It was a joy to watch your presentation, having come from a family of 3 electricians I often will go to video sources such as YouTube to educate or reeducate myself . Like most people I am a better hands on learner than a print learner. Your video makes a simple job even more simple by watching and also by the added tips your perform . Your voice inflections also kept me very interested .Great job don’t change a thing.

    Mark Locurcio on
  • I concur with vtech. I just converted the two dual-bulb T12 fixtures in my 1970s kitchen ceiling to direct wire LED. The ballasts I removed were VERY warm to the touch, indicating that they had been wasting a fair amount of electricity just before I shut down the power to modify the fixture.

    I strongly endorse doing the job right and converting to direct wire LED. The average homeowner who does his own light repairs and maintenance can easily make the change, which took me less than 30 minutes for two fixtures.

    John E on
  • We have T12 fixtures. Are you saying that I can use your LED bypass tube in my fixtures or do I have to buy specific T8 or T12 LED tubes??

    Gerry on
  • Are there fluorescent tube replacements that emit light in only one direction? For example, for ceiling lights you may choose tubes that emit light in a 45 degrees wide beam downward (something like flood lights).

    Vlad on
  • I don’t understand why anyone would keep the ballasts on any fixture. If you are changing over to LED, the point is to save energy. The ballast is the biggest energy hog in a light fixture. The magnetic ballasts consume around 25% additional energy.

    vtech on

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