A CFL’s spiral tube contains argon and mercury vapors, and they are far more efficient than the old Edison bulb. When an electrical current is passed through the vapors, invisible ultraviolet light is produced.
The ultraviolet light is transformed into visible light when it strikes a fluorescent coating on the inside of the tube.. all at about one-fourth the electrical cost for an equivalent amount of light from an incandescent lamp.
LEDs, in contrast, don’t use commonplace materials. Rather, they’re made from somewhat exotic semiconductor materials, like indium and gallium nitride. When an electrical current is passed through these semiconductors, energy is released in the form of particles called photons—the most basic units of light in physics, i.e., light’s equivalent of individual electrons.
In the process, little is lost to heat and the materials take minimal wear, making for another very efficient light source, and one that lasts far longer than its competitors.
Note that the article seems to be recommending an investment in a specific company BUT the company is not named(!!!).
Source: http://electricalcontractor.com/?p=15031
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