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 ?
A CFL bulb will cost you around PS2.04 to run per year.
Each recycled CFL bulb becomes a new bulb, a process which Mr.
"Each CFL bulb that replaces a standard incandescent bulb can save more than $55 in energy costs over its life."
A broken CFL bulb will contaminate the environment.
I myself have now tested over 200 patients with muscle-strength tests at 8 feet from a CFL bulb. The bulb is in a gooseneck lamp (so they can't see it), but 95% or more of the patients go weak when it is turned on.
Although a CFL bulb contains significantly less mercury and lead than it did a decade ago, the bulb still must be handled in a responsible manner for disposal.
Hence, a three dollar CFL bulb maybe subsidised by 60 to 90 per cent, thereby making it affordable.
If you want the same brightness from a CFL bulb, look for one with a lumen output comparable to the bulbs you normally use.
Now, an environmental group has compiled a list of CFL bulbs that contain less than the 5 milligrams of mercury found in an average CFL bulb.