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Bridgelux silicon LED could mean bright future for solid state lighting
While Democrats and Republicans squabble over the future of the incandescent light bulb, a Livermore-based company has produced an LED that they claim could lead to brighter, more affordable solid state lighting. By growing gallium nitride on low-cost silicon wafers, as opposed to the typical sapphire and silicon carbide substrates, the company has achieved an output of 135lm/W (lumens per watt) with a color correlated temperature of 4730K-- brighter than any affordable LED lighting solution we've ever seen. Of course, this isn't the first time efficacy of this level has been achieved, and we've yet to see a practical application, but if Bridgelux's numbers are right, this could mean a 75 percent cut in LED production costs. The company expects the technology to make its way to real world lights in the next two to three years -- perhaps by then the furor over pigtail light bulbs will have settled a bit. Enlightening PR after the break.
LVX System launches visible light communication in the US, finally
Ever wonder what happened to LEDs as a WiFi alternative? Well, wonder no more, because visible light communication is here -- in the municipal offices of St. Cloud Minnesota, at least. Starting tomorrow, LVX System, a Minnesota start-up, is installing the first of a series of LED fixtures that will use flashing lights to connect office workers to the internet, while saving big on the electric bill. The fixtures also function as regular overhead lights, using 36 watts of energy where 100 watts were once necessary. The setup consists of clusters of LEDs that switch on and off thousands of times per second at intervals undetectable to the human eye. The flashes emit binary code data -- off equals zero and on equals one -- that is received by special patented modems. Lights on these modems then transmit data back to the fixtures, and voila, you've got internet. According to LVX, light-powered networks are far less crowded and far more secure than their predecessors. Unfortunately, LVX's current incarnation transmits data at about 3Mbps -- a mere pittance compared to standard WiFi or Ethernet. Then again, 3Mbps is certainly fast enough for a city employee to perform really important tasks like keeping track of their favorite gadget blog, so we'll take it. [Thanks, Andrew]
Inhabitat's Week in Green: salad spinners, diapers, and solutions to the Deepwater catastrophe
The Week in Green is a new item from our friends at Inhabitat, recapping the week's most interesting green developments and clean tech news for us. This week renewable energy received a giant jolt forward as Google unveiled plans to invest $40 million in North Dakota wind farms. Solar power is also having a moment in the sun as MIT unveiled the world's first solar cells printed on paper - we can't wait to see a post-it version that we can stick to our walls! Meanwhile a team of Swiss researchers are harnessing rays of light for an entirely different purpose -- they've figured out a way to create rain clouds by shooting laser beams into the sky. With the Deepwater Horizon oil spill still saturating the sea weeks after the leak sprung, we also looked at an array of innovative solutions for cleaning up the catastrophe. The first step to stemming the spill's damage is predicting its spread, which is why scientists are harnessing advanced virtual reality models to aid in cleanup efforts. We also took a look at the BP's first massive oil containment dome, which the company plans to lower 5,000 feet below the sea to plug up the leak. This week we also looked at several ingenious inventions that find incredible new uses for everyday items. Two students at Rice University have transformed a simple salad spinner into a centrifuge that can save lives by diagnosing diseases, and a Japanese company called Super Faith has invented a machine that can transform used adult diapers into an energy source. Finally, we were dazzled by two high-tech garments that harness LEDs to light up the night. Katy Perry recently took to the red carpet wearing a shimmering gown studded with thousands of blinking rainbow lights, and we were impressed by this LED-laden coat that keeps bicyclists safe when they hit the streets at night.
