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Home » How Can You Tell The Difference Between T8 And T12 Bulbs? The 11 Top Answers

How Can You Tell The Difference Between T8 And T12 Bulbs? The 11 Top Answers

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The main difference between T8 and T12 tubes is the tube’s diameter. T12 tubes are 1.5″ in diameter while T8s are just one inch. All other things—socket sizes, lengths, distance between pins—are the same. T8 LED tubes won’t fall out if you try to install them in a T12 fixture—they’ll fit just fine.If no markings are available, the size in diameter of the tube is the easiest way to determine the type you have installed. T8 tubes are 1-inch in diameter and T12 tubes are 1 1/2 -inch.If you do not see markings, the size or diameter of the tube will be the easiest way to tell the kind that you have installed. T8 tubes will be one inch in diam. and T12 will be 1 1/2 inch in diameter. If you happen to have a tube that is relatively small in diameter, about 5/8 of an inch, it is a T5.

How Can You Tell The Difference Between T8 And T12 Bulbs?
How Can You Tell The Difference Between T8 And T12 Bulbs?

Table of Contents

How do I know if I have 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. T8 tubes are 1-inch in diameter and T12 tubes are 1 1/2 -inch.

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How do I know if my bulb is a T8?

If you do not see markings, the size or diameter of the tube will be the easiest way to tell the kind that you have installed. T8 tubes will be one inch in diam. and T12 will be 1 1/2 inch in diameter. If you happen to have a tube that is relatively small in diameter, about 5/8 of an inch, it is a T5.


#399: T12 vs T8 vs T5 vs LED Lights – Tank Tip

#399: T12 vs T8 vs T5 vs LED Lights – Tank Tip
#399: T12 vs T8 vs T5 vs LED Lights – Tank Tip

Images related to the topic#399: T12 vs T8 vs T5 vs LED Lights – Tank Tip

#399: T12 Vs T8 Vs T5 Vs Led Lights - Tank Tip
#399: T12 Vs T8 Vs T5 Vs Led Lights – Tank Tip

Do T8 and T12 bulbs interchangeable?

T8 tubes are simply 1 inch in diameter versus the 1.5 inch diameter of T12 tubes. In an effort to make LED tube lights compatible with the internal dimensions of most fixtures, you will find that most LED tube lights feature a T8 or 1 inch diameter. They can indeed be used in T12 fixtures.

Can I replace a T12 fluorescent bulb with a T8?

yes you can change from T12 to T8, Just change the light, and you are done.

How do I identify a fluorescent light bulb?

Fluorescent tube shape

Linear fluorescent lamps typically include a “T” in the shape abbreviation with a number following it. This “T” stands for tube and the number that follows is the diameter of the tube. That number is divided into 8 to translate into inches. So a T8 has a one inch diameter.

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Can I use a T8 LED tube in a T12 fluorescent fixture?

Direct-wire compatible T8 LED tube lights can be used in a T12 fixture, as long as the T12 ballast is either bypassed, or completely removed.

Are T12 bulbs being discontinued?

In effect since July 2012, the legislation eliminates nearly all 4-foot T12 lamps, some 4-foot T8 lamps, most 8-foot T12 lamps, and almost all standard halogen PAR38, PAR30 and PAR20 lamps from the market. T12 technology is over 80 years old.


See some more details on the topic How can you tell the difference between T8 and T12 bulbs? here:


Difference between T5, T8, T12 Tubes – Ballast Shop

The “T” in T5 indicates the bulb is tubular shaped, while the “5” denotes that it is five eighths of an inch in diameter. The other common lamps are the larger …

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Difference Between T8 and T12 Bulbs (With Table)

T8 Bulb vs T12 Bulb … The main difference between T8 and T12 bulbs is that T8 bulbs have a diameter of 1.5 inches, whereas T12 bulbs have a diameter of 1 inch.

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Can I Use a T8 LED Tube in a T12 Fluorescent Fixture?

As we describe in our how to article, T8 and T12 feature the same G13 bi-pin connector. T8 tubes are simply 1 inch in diameter versus the 1.5 …

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What is the Difference Between a T8 Light and a T12 Light

The number that comes with the T is used to denote the diameter of the fluorescent tube. Since the measurements come in eights of an inch, the …

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Can you replace 8 foot fluorescent bulb with LED?

Option 1: Retrofitting Your 8ft Fluorescent Shop Lights with LED. So, you want to keep your existing shop lights and just switch them over to 8ft LED bulbs. No problem: this is a simple wiring job that takes about five minutes per fixture, once you get the hang of it.

Can you put LED lights in a fluorescent fixture?

You have fluorescent tube lights in your home or business already, and you’re wondering if you can pop LED tubes in these fixtures or if you’ll need to change out the fixtures for something designed for LED. Good news! You can use LED tubes in your existing fixtures!


T8 T12 Fluorescent Light Tubes What’s the Difference?

T8 T12 Fluorescent Light Tubes What’s the Difference?
T8 T12 Fluorescent Light Tubes What’s the Difference?

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Images related to the topicT8 T12 Fluorescent Light Tubes What’s the Difference?

T8  T12 Fluorescent Light Tubes What'S The Difference?
T8 T12 Fluorescent Light Tubes What’S The Difference?

Are T8 or T12 bulbs brighter?

The standard T8 produces 2,800 initial lumens per lamp, 6% brighter. But the standard T12 lamp produces 2,300 design lumens and the T8 produces 2,660 design lumens.

How do I know what type of ballast I have?

Simply turn the light on, then take a photo of the fixture using your smartphone or digital camera. If there are no dark bands on the resulting image, you have an electronic ballast that will work with direct drop-in LED tubes.

What does T8 or T12 mean?

A T12 lamp (on the left in the figure below) is therefore twelve-eighths of an inch, or one-and-one-half inches (3.81 cm), in diameter. A T8 lamp (on the right in the figure below) is eight-eighths of an inch, or one inch (2.54 cm), in diameter.

How do you change a T12 fluorescent bulb to an LED?

3 steps to retrofit from T12 to LED
  1. Set goals.
  2. Build a budget.
  3. Know your T12 replacement options.
  4. A. Install a direct wire or ballast-bypass linear LED lamp.
  5. B. Install magnetic and electronic ballast-compatible linear LEDs.
  6. C. Install electronic ballast-compatible linear LEDs and a new electronic ballast.
  7. D. …
  8. E.

How do I know what size fluorescent light I have?

First, you will need the diameter or how wide it is around. This is expressed as a number such as T8 or T12. The “T” stands for tubular, and the number is a measurement of the diameter in 1/8″ increments. So a bulb with a 1″ diameter would be a T8—eight 1/8″ increments.

What do the letters and numbers mean on fluorescent bulbs?

Lamps are typically identified by a code such as FxxTy, where F is for fluorescent, the first number (xx) indicates either the power in watts or length in inches, the T indicates that the shape of the bulb is tubular, and the last number (y) is the diameter in eighths of an inch (sometimes in millimeters, rounded-up to …

Can you replace fluorescent tubes with LED?

Yes, you can replace fluorescent tubes with LED tubes or LED-integrated fixtures. If you just want to replace the bulbs, you can use plug-and-play, direct-wire, or hybrid LED tubes. Plug-and-play tubes are the easiest to install as they do not require any rewiring to the fixture.


How To Convert Your Old T8 and T12 Fluorescent Fixtures to Brighter LED Bulbs

How To Convert Your Old T8 and T12 Fluorescent Fixtures to Brighter LED Bulbs
How To Convert Your Old T8 and T12 Fluorescent Fixtures to Brighter LED Bulbs

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How To Convert Your Old T8 And T12 Fluorescent Fixtures To Brighter Led Bulbs
How To Convert Your Old T8 And T12 Fluorescent Fixtures To Brighter Led Bulbs

Do I need to remove the ballast to use an LED bulb?

An LED light does not require a ballast because it uses a component called a “driver” to regulate the power going into the bulb.

Are T12 sockets shunted?

If your fluorescent fixture has an instant start ballast, you will need shunted sockets. When retrofitting a fluorescent fixture with a single lamp or replacing an old socket, look for individual non-shunted sockets. Many of these sockets can be used with both T8 and T12 tubes.

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