Compact fluorescent lamp

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fluorescent bulb

A light source consisting of a long glass tube containing mercury in a partial vacuum. Available in many lengths and several diameters, the tube is lined with a fluorescent phosphor. When the mercury is excited by electricity, it emits ultraviolet (UV) light, which causes the phosphor to emit visible light. Fluorescent lamps have been widely used in commercial buildings for decades, because they use considerably less power and last much longer than incandescent lighting. However, due to their tubular design and cooler color temperatures, they have not been generally welcome in the home.

The Compact Fluorescent Lamp (CFL)
Compact fluorescents are designed to replace the standard incandescent bulb and screw into everyday table lamps and lighting fixtures. They are available in soft, warm hues like incandescent bulbs. See fluorescence, incandescent bulb, halogen bulb, LED bulb and color temperature.


CFL Coils and U's
Instead of straight tubes, coiled and U-shaped CFL tubes screw into the standard Edison base in incandescent lamps and fixtures. See Edison base.
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Compact fluorescent lamp

Fluorescent light bulb in which the tube is folded or twisted into a spiral to concentrate the light output. Compact fluorescent lamps (CFLs) are typically three to four times as efficient as incandescent light bulbs and last 8–10 times as long. CFLs combine the efficiency of fluorescent light with the convenience of an Edison or screw-in base, and new types have been developed that better mimic the light quality of incandescents. Not all CFLs can be dimmed, and frequent on-off cycling can shorten their life. Concerns have been raised over the mercury content of CFLs, and though they have been deemed safe, proper recycling and disposal are encouraged.
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References in periodicals archive ?
They would cost just 70c a year to run, compared with [euro]2 for a fluorescent eco-bulb and [euro]1.70 for LED, and give off 40% of their energy as light - beating LED's 14%.
And I read in the Record that the German Federal Environment Agency says a broken eco-bulb released dangerous levels of mercury.
They would cost just 50p a year to run, compared with PS1.53 for a fluorescent eco-bulb and PS1.27 for LED, and give off 40% of their energy as light - beating LED's 14%.
And if you break an eco-bulb, you need to take a bit of extra care.
THOSE eco-bulbs we'll all have to have in our homes by 2012 take a bit more effort to dispose of than ordinary bulbs when they eventually die.
They said that broken eco-bulbs posed a potential health risk to pregnant women, babies and small children.
I asked about the facilities for disposal and the chap on the other end explained they had a bin for florescent tubes and the eco-bulbs went in there.
According to his Facebook entry on Friday: "Ciaran Cuffe is watching the Christmas lights from his office on Patrick Street in Dun Laoghaire - none of them namby-pamby eco-bulbs here!"
Urging us to replace incandescent light bulbs with 'low-energy eco-bulbs' is laudable but these bulbs have several drawbacks.