Professor Invents The Best New Lightbulb

23. ledna 2013 v 4:17 |  street light
Part of the reason the figure is so high is that traditional incandescent bulbs (Edison's filament bulb) eat up a lot of power to produce light: 90 percent of the energy is wasted as heat.

So far the main alternatives to the common bulb have been compact fluorescent lights, or CFLs, and light-emitting diodes, or LEDs, which can produce the same amount of light as traditional bulbs while using way less energy.

Soon, a third lighting option will be thrown into the mix. It's called the FIPEL, which is short for field-induced polymer electroluminescent technology.

"This is the first new lightbulb in about thirty years," says Dr. David Carroll, a professor of physics at Wake Forest University in North Carolina, who developed the new light source. To understand how this technology functions, you can think of how a microwave works, Carroll explains.

Take a potato, for example. When you place your potato in the microwave and press start, the device hits the potato with microwaves that induce what's known as a displacement current, meaning it makes the water molecules in the potato flip back and forth. This heats the potato up. What Carroll and his team have done is develop a special type of plastic that, when hit with an electric current, induces a displacement current in the same way. But in this case, it doesn't give off heat, it gives off light.

The new light source is made of several layers of very thin plastic. Each sheet is about 100,000 times thinner than the width of a human hair. The plastic is inserted between an aluminum electrode and a transparent conducting electrode. When a current is passed through the device, it stimulates the plastic to light up.

Luckily for Carroll, FIPEL has entered the lighting technology ring at a time of unprecedented opportunity. The phaseout of traditional incandescent bulbs began to take effect at the start of the new year under the 2007 Energy Independence and Security Act.

CFLs use about 75 percent less electricity than Edison's filament bulb to produce the same amount of light. LEDs use even less. This means to make the same light as a 100-watt incandescent, a compact fluorescent uses 23 watts and an LED uses 20.

The FIPEL is slightly more efficient than a CFL bulb and on par with an LED, but comes with a few advantages over these other types of lights. CFLs and other fluorescent lightbulbs contain a very small amount of mercury, which can be toxic if not disposed of properly. FIPELs do not use any caustic chemicals in manufacturing and can easily be recycled because they're made of plastic.

Some LEDs give off a blueish tint, which many people don't like to look at. FIPEL, on the hand, can be made to have any tint, including the yellowish hue of the sun that our eyes have come to prefer, having evolved on Earth.

"From a pure physics point of view, the best efficiency that you could ever accomplish with this lamp is still going to be slightly lower than the best efficiency you could ever accomplish with an LED," says Carroll. Right now, LEDs do not perform at their theoretical best. But as both technologies mature, you can expect the LED to come out on top in terms of overall efficiency.

The FIPEL technology is currently under an exclusive world-wide license by CeeLite Technologies. David Sutton, management consultant for CeeLite, said the first units for commercial use will be available by the end of 2013. The new bulb will cost less than LEDs and slightly more than CFLs.
 

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