LRC researchers have developed a Scattered Photon Extraction (SPETM) method to improve the light output and efficacy of white LEDs. The SPE method combines optimally shaped optics and placement of the phosphor away from the die. This configuration allows light traveling back toward the die to escape through the sides of the optics, generating 30 to 60 percent more light output (lumens) and luminous efficacy (lumens per watt of electricity) than typical white LEDs. At low operating currents, the new SPE LEDs are able to achieve an efficacy of more than 80 lumens per watt (lm/W). The industry’s goal is to achieve 150 lm/W by 2012. Moreover, moving the phosphor layer improves LED life.
[tags: LED]
Quoted: White LED (light emitting diode) lamps consume less than a quarter of the electricity that fluorescent lighting does, and the lamps last about ten times as long.
[tags: LED]
An LED is usually a small area source, often with extra optics added to the chip that shapes its radiation pattern.[1] The color of the emitted light depends on the composition and condition of the semiconducting material used, and can be infrared, visible, or near-ultraviolet. An LED can be used as a regular household light source.
[tags: LED]
Quoted: In this VideoNation report, Naomi Klein explains how after 9/11 the Bush Administration launched a new security economy, driven by the notion of an endless war against an undefined evil.
Greenspan's new autobiography sheds light on what motivates hard-right political leaders to apply brutal economic shock therapy.
One woman delves deep into the causes of the anorexia that nearly killed her. But of one thing she's sure -- it had nothing to do with 'size 0' models.
[tags: health]
Quoted: Outsourcing the war to private military contractors such as Blackwater has shattered the United States' moral authority and its ability to win the nation's wars -- including Iraq.
[tags: Blackwater]
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