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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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Q: On your 4 bulb fluorescent only 2 bulbs come on?
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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.


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.


Does the shape of a light bulb matter?

It most certainly does. For one, there is the matter of aesthetics. Different shapes are used for different decorative applications. Round ("G" for globular) are often used in light fixtures in baths and dressing rooms as opposed to the most common "PS" or "pear shaped" light bulbs. Some light fixtures and portable lamps will only accept "T" (tubular) light bulbs such as picture and piano lamps. Certain shapes are determined by the electrical characteristics of the light bulb. Fluorescent light bulbs are tubular as a result although the tube may be wrapped or formed into different overall shapes, it is still a tube. Compact fluorescent light bulbs are simply fluorescent tubes that have been folded or wrapped into a compact shape. Light bulbs using reflectors have to be of a certain shape in order to properly reflect light in a certain direction and pattern.


Saving Your Dad Money on Fathe's Day 2011?

For Fathers Day 2011, think about eschewing the typical gifts and giving your dad something more practical. Change out all of the light bulbs in his home with energy efficient bulbs. Because energy efficient light bulbs use much less power than incandescent light bulbs, a house full of them will drop utility bills dramatically. When choosing energy efficient bulbs for Fathers Day 2011, you will have three options. First, you can swap out the bulbs for fluorescent lights. Fluorescent lights are inexpensive, but you will more than likely have to change out all of the lamps and lighting fixtures since the bulbs are not compatible with lamps that take incandescent bulbs. Next, you can opt for the compact fluorescent lamp (CFL) bulb, which are fluorescent lights that are made to fit into traditional light bulb receptacles. Not only do these bulbs use much less energy than regular bulbs, but they will also last much longer, saving your father money in the long run. Finally, you can choose to buy light emitting diode (LED) bulbs, which are also energy efficient. Because these are new, they are more expensive on the front end, but will last longer than CFL bulbs as well as use less energy.

Related questions

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.


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.


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 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.


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.


Is it true that one must operate compact spiral fluorescent light bulbs only with the base down not in inverted or horizontal sockets?

No, this is not true. The spiral-type compact fluorescent bulbs can be operated in any orientation provided that there is sufficient air circulation around the bulb. But if you put the bulb in a fixed enclosure then it will last longer if the base is facing downwards so that the heat is conducted away from the electronics in the ballast. Always follow the manufacturers's directions - usually written on the bulb. No, this is not true. The spiral-type compact fluorescent bulbs can be operated in any orientation provided that there is sufficient air circulation around the bulb. But if you put the bulb in a fixed enclosure then it will last longer if the base is facing downwards so that the heat is conducted away from the electronics in the ballast. And, always follow the manufacturers's directions - usually written on the bulb. Regards, Laszlo Herczeg, laszlo DOT herczeg AT austinenergy.com


Can you put compact fluorescent bulbs in range hoods?

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


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.


Does a light bulb convert electrical energy to both heat and light energy?

Yes. Heat is radiated as infra-red, a longer wavelength than visible light, but otherwise similar. Incandescent light bulbs with a heated filament emit infra-red light as heat, and only a small part of the emission is visible. Other light bulbs using electrical discharges in neon gas (known as fluorescent bulbs) do not produce as much infra-red, and are more efficient in the conversion of electrical energy into light. If you feel a fluorescent tube you will find it is only warm, but DO NOT feel an incandescent bulb or you will burn your hand, its so hot.


Will a condensed fluorescent bulb work as a grow light for garden?

Only if you buy a "full spectrum" of "grow light" type of compact bulb.