How many volts does a ballast put out?

Asked By: Taysir Neymans | Last Updated: 24th March, 2020
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Fluorescent lamps use a ballast which transforms line voltage to a voltage to start up and operate the lamp(s). Newer fluorescent ballasts are usually rated for both 120 volts and 277 volts. Some are rated for only 120 volts, others for only 277 volts (used in commercial environments).

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Just so, what is the output voltage of a t12 ballast?

When power is first applied, a high voltage (several hundred volts) is needed to initiate the discharge. However, once this takes place, a much lower voltage - usually under 100 V for tubes under 30 watts, 100 to 175 volts for 30 watts or more - is needed to maintain it." Fluorescent Tube and Switching Ballasts.

Also Know, do ballasts use energy? The ballast will consume about four watts when the lamps are removed although the ballast is still energized. Electronic ballasts start and regulate fluorescent lamps with the use of electronic components. By de-energizing the cathode, energy is reduced by an additional 2 - 2.5 watts per F40 lamp.

Also question is, what is inside a fluorescent ballast?

An inductor is very common in line-frequency ballasts to provide the proper starting and operating electrical condition to power a fluorescent lamp, neon lamp, or high intensity discharge (HID) lamp. (Because of the use of the inductor, such ballasts are usually called magnetic ballasts.)

How much does a ballast cost?

A replacement ballast costs about $10-25 depending on capacity and brand. The bite is that an electrician trip charge (which includes 30 or 60 minutes work) is going to be $75-150 probably - for about 5 minutes work on each light fixture.

39 Related Question Answers Found

Can a ballast be repaired?

While simply swapping burned out bulbs in an existing ballast is deemed “ballast repair” by many – and can offer advantages in longevity and energy savings – sometimes this simple “fix” is not enough.

Does a ballast increase voltage?

What is 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 ballast to limit its current, a fluorescent lamp connected directly to a high voltage power source would rapidly and uncontrollably increase its current draw.

How do I know if my t8 ballast is bad?

5 symptoms of a bad fluorescent ballast
  1. Flickering.
  2. Buzzing.
  3. Delayed start.
  4. Low output.
  5. Inconsistent lighting levels.
  6. Switch to an electronic ballast, keep lamp.
  7. Switch to an electronic ballast, switch to a T8 fluorescent.
  8. Switch to an electronic ballast, switch to T8 linear LED.

Can a bad ballast cause a breaker to trip?

If the primary winding in the ballast goes bad they almost always trip the breaker, unless there is a fuse installed just ahead of the ballast. After checking all of the wiring, as you have been directed to do, the last chip is a bad ballast.

What causes a ballast to go bad?


Causes of Ballast Failure
Every ballast has an ambient operating temperature range and UL location rating. When it's too hot or too cold, the ballast can burn or fail to start your lamps at all. Heat combined with prolonged condensation inside an electronic ballast can cause corrosion.

How do I know if I have a t8 or t12 ballast?

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. T8 tubes are 1-inch in diameter and T12 tubes are 1 1/2 -inch.

Is ballast and choke same?

An electrical ballast (sometimes called control gear) is a device intended to limit the amount of current flowing in an electric circuit. A choke is an inductor designed to have a high reactance to a particular frequency when used in a signal-carrying circuit.

What is the purpose of a ballast resistor?

First, the ballast resistor is the long, white ceramic thing attached to the left side of the coil assembly. Basic function: the ballast resistor is a resistor contained in the primary ignition circuit wiring that lowers voltage after the engine is started to reduce wear on ignition components.

Do you need a ballast for LED lights?

No LED bulbs require a ballast, although some are engineered to work with an existing ballast. You will find ballast-compatible, or "plug-and-play" LEDs that are designed to replace linear fluorescents, compact fluorescents, or HIDs. Fluorescent lamps and HID (high intensity discharge) light bulbs do require a ballast.

Can a fluorescent light work without a ballast?


Reverted question “ Can I make a fluorescent light work without a ballast?” yes, you can, but you need something to reduce the current as the bulb warms up. So, you can drive a fluorescent with a pulse width adjustable power supply, but this is what is in an 'electronic' ballast.

How do you bypass a ballast?

How to Bypass a Ballast
  1. Turn off the power. Flipping the light switch to the “off” position does not necessarily end the flow of electricity.
  2. Locate your ballast.
  3. Cut the hot and neutral wires.
  4. Cut the socket lead wires.
  5. Remove the ballast.
  6. Connect the input wires to the output wires.

How do you size a fluorescent ballast?

By selecting a ballast with an ideal ballast factor, you can optimize the light output of your fluorescent lighting system and maximize your energy savings. To estimate your total system lumens, multiply the rated lumens of your lamp by the ballast factor. For example, 3200 lumens x 0.77 BF = 2464 total system lumens.

How do I change an electrical ballast?

Replace the fluorescent light ballast in four steps.
  1. Photo 1: Remove the bulbs and fluorescent light fixture cover. Unplug the fixture or turn off the power at the main panel.
  2. Photo 2: Cut the old ballast wiring.
  3. Photo 3: Unscrew the old ballast.
  4. Photo 4: Install the new ballast.

Are ballasts worth money?

You can check out our website to view the 30-day average so it can help you determine when it's a good time to bring in your ballasts for recycling.

Ballasts Historical Scrap Prices.
(Last Modified: March 13th, 2020, 7:57 am)
Metal/Material Current Price
500-750 MCM (Bare Bright Inside) $1.52/lb

How do I know if my ballast is instant start?


You can determine whether you have a compatible fixture in seconds. 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.

How does a ballast work?

Simply put, the ballast is the heart of a fluorescent light fixture sending energy (pumping blood) through the lamp. A ballast provides the correct amount of voltage to start the lamps and regulates the amount of current that flows to them once they're on.

Are light ballasts recyclable?

Disposal of Fluorescent Light Ballasts (FLB) Polychlorinated biphenyls (PCBs) were commonly used in the small capacitor within fluorescent light ballasts. Ballasts manufactured through 1979 may contain PCBs. The non-leaking ballasts can be removed and recycled or disposed of properly.