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Can You Use a 2 Lamp Ballast for 4 Lamps?

FAQs Jackson Bowman August 30, 2022

A 4-lamp fixture with dual quick-start ballasts can be replaced with a 4-lamp instant-start ballast. As seen below, connecting the 4 lamp instant start ballast to the 4 lamps can be a bit confusing.

Can a 4 lamp ballast be used for a 2 lamp fixture?

Some four lamp ballasts are also rated for three lamps or for two lamps. Some ballasts for two lamps are also designed for one lamp. It varies by manufacturer and model, so there are no general instructions.

Will a 2 lamp ballast work for 3 lamps?

A 3-lamp fixture with dual quick-start ballasts can be replaced with a 3-lamp instant-start ballast. As can be seen below, hooking up the 3 lamp instant start ballast to the 3 lamps can be a bit confusing. This is because the wire colors on the ballast and lampholders do not match.

Does it matter which ballast to use?

It must meet the electrical requirements of the lamp it is intended to power. When purchasing a ballast, you need to read what type of lamp it is designed for, how many lamps it will operate, and what voltage the lamps will operate at. Choosing the right ballast for a lamp optimizes light output and bulb life.

Can you use a two lamp ballast for one lamp?

How to replace the 1 lamp quick start ballast with the 2 lamp quick start ballast. A 1 lamp fast start (series) ballast can be hard to find, but it can be replaced with a 2 lamp fast start ballast. How to Wire a 2-Lamp Ballast to a 1-Lamp Luminaire

How do you bypass a ballast on a 4 light fixture?

How many ballast are in a 4 bulb fluorescent light?

Luminaires with dual ballasts

A 4-lamp luminaire with two quick-start ballasts can be replaced with a 4-lamp instant-start ballast.

How do you wire a 4 lamp ballast to a 3 lamp fixture?

How do you wire a 4 lamp ballast?

How do you bypass a ballast on a 3 bulb fixture?

Are ballasts interchangeable?

Matching ANSI codes guarantee that the ballast you have chosen will work with your lamp. However, ballasts are often compatible with more than one lamp and vice versa.

How do I know if a ballast is compatible?

You can find out if you have a compatible device in seconds. Just turn on the light and then take a picture of the light with your smartphone or digital camera. If there are no dark stripes in the resulting image, you have an electronic ballast that works with direct drop-in LED tubes.

Are all ballasts the same?

And there are two types of ballasts in each family: magnetic and electronic. Magnetic ballasts are the older ballast technology. For the fluorescent family, both linear T12 fluorescent lamps and double pole CFLs use magnetic ballasts. For HIDs, some metal halide and HPS lamps use magnetic ballasts.

What happens if you wire a ballast wrong?

If a ballast fails, it can cause a short circuit, burn out tubes or even cause a fire, so it needs to be replaced. Lights that won’t turn on, fluorescent tubes that have blackened ends and brown burnt tube electrodes are all signs of a bad ballast.

How do you replace a double ballast?

How do you wire a single light ballast?

Is it safe to bypass a ballast?

The main disadvantage of a linear LED with ballast bypass is the risk of electric shock since the sockets are line voltage. It is common to place a finger on the lamp pins while attempting to install them and this becomes a risky proposition when using single ended ballast bypass lamps.

Can a fluorescent light work without a ballast?

In a fluorescent lighting system, the ballast regulates the current to the lamps and provides sufficient voltage to start the lamps. Without a current-limiting ballast, a fluorescent lamp connected directly to a high-voltage source would quickly and uncontrollably increase its current draw.

What does ballast bypass mean?

Ballast bypass occurs when you remove a ballast from the circuit leading to your luminaire.

How do I know if I have a T8 or T12 ballast?

If there are no markings, the size in diameter of the pipe is the easiest way to determine the type you have installed. T8 tubes are 1″ in diameter and T12 tubes are 1 1/2″ in diameter.

References:

  1. https://forums.mikeholt.com/threads/running-two-lamps-from-a-4-lamp-ballast.105263/
  2. https://www.electrical101.com/replace-3lamp-2series-ballasts-with-parallel.html
  3. https://blog.lightingsupply.com/blog/your-complete-introduction-to-lighting-ballasts
  4. https://www.electrical101.com/replace-1lamp-series-ballast-with-2lamp-series.html
  5. https://www.parmida.com/blogs/posts/how-to-bypass-a-ballast
  6. https://www.electrical101.com/replace-two-2lamp-seriesballast-with-parallel.html
  7. https://www.electrical101.com/replace-3lamp-parallel-ballast.html
  8. https://www.youtube.com/watch?v=098dpjLfyPc
  9. https://www.youtube.com/watch?v=PDMpdh5ONoA
  10. https://blog.1000bulbs.com/home/choosing-the-right-fluorescent-ballast
  11. https://www.eledlights.com/blog/post/quick-way-to-tell-which-ballast-you-have/
  12. https://insights.regencylighting.com/what-are-the-different-types-of-ballasts
  13. https://homeguides.sfgate.com/rewire-electric-ballast-33046.html
  14. https://www.youtube.com/watch?v=J2tpuf45ceE
  15. https://www.youtube.com/watch?v=KfV3CLGVz-U
  16. https://insights.regencylighting.com/does-bypassing-the-ballast-with-an-led-tube-void-the-ul-rating-on-a-fixture
  17. https://www.lrc.rpi.edu/programs/nlpip/lightinganswers/adaptableballasts/ballast.asp
  18. https://www.warehouse-lighting.com/blogs/lighting-resources-education/plug-and-play-vs-ballast-bypass
  19. https://www.earthled.com/blogs/light-2-0-the-earthled-blog-led-lighting-news-tips-reviews/33135492-how-to-buy-t8-and-t12-led-fluorescent-replacement-tubes

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