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On the older fluorescent fixtures a four bulb fixture required two ballasts. Two lamps for each ballast. If you have changed the tubes and it still does not work, it sounds like one of the ballasts is not working. You might want to consider replacing the ballast with an electronic one. One electronic ballast will operate four tubes. The existing end sockets can be re used but they will have to be rewired. There is a diagram on the ballast label that shows the connections. This will allow you to use T8 lamps which are lower wattage. This will save money to you in the long run.

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โˆ™ 2009-12-10 04:58:40
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Q: On your 4 bulb fluorescent only 2 bulbs come on?
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What is wrong when only two of four new fluorescent bulbs will light in the 4 bulb fixture?

There might be a problem with the actual bulbs when only two of the four new fluorescent bulbs will light in the 4 bulb fixture. In some cases the ballast might be damaged or there might be an issue with the electrical connection from the bulb to the ballast.


What makes the fluorescent light bulb preferable to any other light bulb?

Fluorescent light bulbs are higher efficiency than old-type incandescent light bulbs, as also are hogen and, especially, LED light bulbs. High efficiency light bulbs use less electricity, so you not only save money you also contribute in a small way to reducing our greenhouse gas emissions.


How many types of starter are there for fluorescent bulbs?

I only know of ONE type but there are about 5 sizes There are programmable, rapid and preheat fluorescent starters.


What is the most economical incandescent bulb 10 watts or fluorescent lamp 10 watts and why?

the most economical is the incandescent bulb because the power of bulb is low only while the fluorescent lamp is low and additional the power of ballast from 10%-20% power consumed.but the fluorescent lamp is 5 times brightly the incandescent bulb.


How long do fluorescent light fixtures last?

Fluorescent light bulbs are extremely long-lasting. Most are designed to last over 10,000 hours. This comes out to approximately 416 days of continuous 24 hour usage. Even if used only 8 hours/day, the average fluorescent bulb should last over 3 years.

Related questions

What is wrong when only two of four new fluorescent bulbs will light in the 4 bulb fixture?

There might be a problem with the actual bulbs when only two of the four new fluorescent bulbs will light in the 4 bulb fixture. In some cases the ballast might be damaged or there might be an issue with the electrical connection from the bulb to the ballast.


The brightness of a light bulb is determined by its filaments?

The brightness of a light bulb is determined by its filament's watts. This is only the case with incandescent light bulbs - LED and fluorescent bulbs operate differently.


Are regular light bulbs or fluorescent bulbs worse for the environment?

On the one hand, fluorescent bulbs contain toxic materials that can be released when the bulb is dumped. On the other hand, fluorescent bulbs last so much longer than do regular, or incandescent, bulbs that this problem is minimised. More importanlty, fluorescent bulbs use only about one-fifth the electricity of incandescent bulbs, thus helping us to reduce our greenhouse gas emissions and therefore slow down global warming. Since global warming is by far the greatest environmental danger we face, fluorescent bulbs must be better for the environment.


What makes the fluorescent light bulb preferable to any other light bulb?

Fluorescent light bulbs are higher efficiency than old-type incandescent light bulbs, as also are hogen and, especially, LED light bulbs. High efficiency light bulbs use less electricity, so you not only save money you also contribute in a small way to reducing our greenhouse gas emissions.


Are fluorescent bulbs supposed to be changed at the same time in two-bulb lights such as in a kitchen?

No, you only need replace the one that's broken. They all run independently.


Why can't you dim fluorescent light bulbs?

Some fluorescent lamps (bulbs) can be dimmed, but they must be designed to be dimmable. The ballasts and electronics that drive the bulb have to be designed to work with a dimmer or they will not function properly and may overheat. When dimming fluorescent bulbs, many can't be faded smoothly from full to zero. Some will only go to a minimum like 5-20%. A dimmable compact fluorescent lamp will be labelled as being dimmble and can be connected to an ordinary dimmer. For tubes, the ballast has to be specailly designed to be dimmable.


Why can light bulbs be called heat bulbs?

Heat bulbs would be a more appropriate name because incandescent bulbs transform 90% of electricity received into heat and 10% into light. New Compact Fluorescent light bulbs use only 20% to 30% of the energy needed to power a standard bulb for the same wattage.


How many types of starter are there for fluorescent bulbs?

I only know of ONE type but there are about 5 sizes There are programmable, rapid and preheat fluorescent starters.


How many volts in a little light bulb?

Small bulbs come in many different voltages. It will always be marked on the bulb and will only work correctly with that proper voltage applied.


What is the most economical incandescent bulb 10 watts or fluorescent lamp 10 watts and why?

the most economical is the incandescent bulb because the power of bulb is low only while the fluorescent lamp is low and additional the power of ballast from 10%-20% power consumed.but the fluorescent lamp is 5 times brightly the incandescent bulb.


How long do fluorescent lights last?

Fluorescent light bulbs are extremely long-lasting. Most are designed to last over 10,000 hours. This comes out to approximately 416 days of continuous 24 hour usage. Even if used only 8 hours/day, the average fluorescent bulb should last over 3 years.


Can you put compact fluorescent bulbs in range hoods?

Only if they are enclosed behind a glass shield or window.

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