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Every once in a while, you will get a dud, but for the most part they are intended to last for up to 10,000 hours. For comparable Lumens, they save about 75% of the energy that a regular filament based incandescent (the regular kind) will use.
Even with the duds, it saves you significant amounts of energy. Get a good bulb, though. You're going to want to like the light quality and a good bulb will last longer. You will save money even if they're giving away the incandescents.
Ideal conditions for a compact fluorescent bulb (CFL) are when the bulb comes on, has a chance to warm up, and then stays on. Closet lights will burn out sooner (per hour of use, but since they're used so less frequently), but you will still save energy.
Modern bulbs come on instantly, but they take about 30 seconds to heat up.
Best of luck!
Wiki User
∙ 13y ago
Wiki User
∙ 10y agoFluorescent 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.
Wiki User
∙ 11y agoIt varies and the life of a bulb should be given on the packaging. Typical life of a normal bulb is 1000 hours, but it is possible to buy bulbs with 2000 or 3000 hour lifetime.
Wiki User
∙ 15y ago7-8000 hours
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Why do you need to have the glass on the outside of a light bulb?
The glass envelope, or bulb, of an incandescent light bulb is needed to hold the inert gas, such as argon, that fills the space. The filament of a light bulb is made of tungsten wire. When electricity passes through it the filament becomes extremely hot and emits light. The inert gas surrounding the filament protects it from evaporating too quickly. A light bulb only lasts as long as its filament lasts.
Why are filaments of bulb coiled?
They have to be coiled in order for them to be long enough to produce enough heat, which produces the light in a small space. Otherwise the light bulb would have to be much larger.A filament bulb is coiled to allow a much longer filament to fit into a tiny space. It also reduces the amount of gas which flows across the inner portion of the filament.
How long did the first light bulb stay lit?
The "The Centennial Light" 4 watt light bulb which was first lit in 1901 and is still in use today at a fire station in Livermore, California.
Why does a light bulb filament act as resistor?
The filament of a light bulb isn't like a resistor ... it is a resistor. The only difference from the ones on circuit boards is the it's designed to operate at a much higher temperature. So hot that it glows. The glass envelope is there to prevent oxygen from getting in and promptly burning it. When the filament becomes too hot it breaks breaking the current that was lighting it in the first place. That is why the light bulb "burns" out.
How long does a halogen light bulb last for?
Any where from 3000-6000 hours :)
How long does a incandescent light bulb last?
It depends on the quality of filament, how often it is switched on and off and fluctuations of supply voltage.
Why did Thomas Edison fail 1000 times?
Edison failed many times - no one knows how many - to make a filament for a light bulb that would last a long time. He did not invent the light bulb - he was working on a BETTER light bulb that would last longer.
Why do you need to have the glass on the outside of a light bulb?
The glass envelope, or bulb, of an incandescent light bulb is needed to hold the inert gas, such as argon, that fills the space. The filament of a light bulb is made of tungsten wire. When electricity passes through it the filament becomes extremely hot and emits light. The inert gas surrounding the filament protects it from evaporating too quickly. A light bulb only lasts as long as its filament lasts.
Does the watage of a light bulb affect how long it lasts?
No, the type of bulb and filament will determine life, as well as how many times it is turned off and on. Repetitive on and off cycles will reduce the life of the filament.
How long does a mood light last?
The mood light will last as long as the bulbs life, which has a lifetime of an average household light bulb. once the bulb burns out, one must replace the bulb with another mood light bulb.
What type of wire is used in a light bulb?
A light bulb glows because of a very fine wire inside the glass bulb called a 'filament'. When an electrical current is put through the filament, assuming the voltage is high enough, it will begin to heat up and glow because such a small wire cannot handle the flow of electrons and has to discharge them through heat and light. Also if you put to much voltage in it will heat up the filament too much and melt it. Incandescent (filament) light bulbs fail over time because they slowly lose small amounts of wire until the filament breaks and stops glowing.
How long did the last light bulb last?
1400 hours
Who invented the improved filament for the light bulb?
The inventer of the long lasting lightbulb is actually was lewis latimer
Why are filaments of bulb coiled?
They have to be coiled in order for them to be long enough to produce enough heat, which produces the light in a small space. Otherwise the light bulb would have to be much larger.A filament bulb is coiled to allow a much longer filament to fit into a tiny space. It also reduces the amount of gas which flows across the inner portion of the filament.
When did latimer improve the light bulb?
he improved the light bulb when he saw that it did not last long and broke easily
How long a light bulb last?
300 hrs
What are incandescent bulbs?
An incandescent light bulb is your common household bulb. It is best identified by the presence of a filament (the thin piece of wire in the center of the glass bulb that glows when turned on.) The incandescent bulb's interior space is a vacuum (all the air is removed) so that the filament doesn't burn up. It produces a warm, slightly gold/yellow light. A "florescent" bulb, on the other hand, has no filament. It works by electrically exiting gas in a long tube creating a cool white light with almost the same color as the sun.
