Like a small hourglass, Trope’s lamps trickle sand through a glass vessel, marking the passage of time. But the kinetic energy generated by the process also generates just enough power to spark an embedded LED light bulb.

Unlike normal lamps that switch on and stay on, unless they are digitally pre-programmed to switch off, these lamps are interactive. Every time the lamp runs out of sand, it is necessary to flip the lamp to start the process again.

In part this helps to generate some awareness of what it takes to keep the lights on, and in a city like New York that never dims, one lamp multiplied can have an incredible cumulative impact.

The four foot Hourglass Floor Table Lamp is suspended and rotates on a hinge that makes it easy to flip when the sand runs out.

The smaller, table version that is designed a little differently to accommodate the light bulb, is nonetheless built with the same principle.

And both are infinitely cool – not just in concept but in execution. Flawless.

:: Inhabitat

The post Danielle Trofe’s Shifting Sands Use Kinetic Power for LED Lights appeared first on Green Prophet.

Fun seems to be the one truly unlimited source of free energy. You can find it in the mountain villages of Turkey, the narrow streets of Jerusalem and the dusty villages of Jordan. Somewhere in Tehran or Cairo or Istanbul even as you read this, this energy is being generated and released as young people practice for the 2014 World Cup. Have you ever wondered at the possibilities of capturing this energy? No I don’t mean harnessing child labor as in some sort of Dickensian dystopia, I mean– what if we could harness some of the boundless energy released when people play, capture it while they are enjoying themselves?

Some students at Harvard University in the US had that same thought and they did something about it. They began experimenting with parts from a generator flashlight and went on to invent a soccer ball which generates electricity every time it is kicked. At the end of a 30 minute game the energy stored in each SOccket ball can light up an LED lamp for up to three hours. It can also be used to charge mobile phones and other small electronic devices.

The four Harvard students, Hemali Thakker, Julia Silverman, Jessica O. Matthews and Jessica Lin received grants from the Clinton Global Initiative University to develop a prototype of their invention. Jessica Matthews and Julia Silverman went on to start a company called Unchartedplay to manufacture the SOccket ball and try to organize sponsorship for the balls to be sent where they are needed the most.

In an interview by Jake Abrahamson of the Sierra Club, Jessica Matthews said that the SOccket is designed for the developing world. It is a durable, 95% recyclable product. She said she sketched out the design for its gyroscopic generator when she was a junior at Harvard.

“Anyone can do the electrical part,” she said, “a trained monkey can do the wiring. The hard part was creating a ball that felt like something you wanted to play with.” Uncharted play has plans to release a new product in 2013.  The new ball is called the Ludo and it tracks play time which can be uploaded and turned into real-world items for social development products.

One in five people live without electricity. In much of the developing world, the only alternative for indoor lighting is kerosene. When Nicholas Negroponte’s XO “One Laptop Per Child” laptop was taken to remote villages in Cambodia, some families were using the kid-powered laptop as their best source of indoor lighting. Another group of students from MIT found a way to use discarded soft-drink bottles for indoor lighting and now Unchartedplay has another fun way to light homes in remote parts of the world. The creative energy of these four young students made it possible.

[youtube]http://www.youtube.com/watch?v=Bi8-wLWqJp8&feature=player_embedded[/youtube]

Photo of child with soccer ball via Shutterstock.

The post sOccket, a Fun-Powered Energy Ball Kids Kick for Power appeared first on Green Prophet.

If only there were a light bulb as efficient as a compact fluorescent light (CFL), but without the ghastly green light and brain-eating  toxic mercury.   Am I asking too much?  The inventors of the Electron Stimulated Luminance (ESL) lights don’t think so.  A company called Vu1 plans to sell ESL bulbs in Europe and the Mideast in 2013.  Vu1 lights are based on cathode ray tube (CRT) technology, are dim-able and have the cozy glow of incandescent light bulbs.  How did Vu1 accomplish this magic?  It helps that I know a little bit about CRTs from the days when my brother and I repaired old televisions.

The Hard Way of Learning About CRTs

Nature Abhors a Vacuum, So Do I: It was the mid 1980s. My brother glared at me in that moment between the sound of breaking glass and the horrible bang-whoosh which tugged at our eardrums and filled the room with a greenish-white cloud, Dad is gonna be mad! I didn’t have time to say, shut up! as we bolted from the room, but I knew it was my fault.  I held my breath to avoid inhaling poisonous mercury fumes from the fluorescent light I had just dropped across the back of Dad’s television.

It was a 1940s vintage Admiral TV with an AM/FM radio, phonograph and a 12 ½ inch picture tube.  It was nearly old enough to have displayed the last time the Chicago Cubs had won the World Series in 1945.  It had been around for Elvis’s debut and the moon landings.  My father had begun to restore it the night before his wedding and my brother had fully repaired it in the mid 1980s– only a few weeks before I destroyed it.

When we mustered the courage to return to the room, we saw that the fluorescent tube was intact but the neck of the TV’s picture tube had broken off.  Air rushing into the vacuum had blown a hole in the screen’s phosphor coating.  I wondered, what we should fear more; mercury vapors, phosphorescent dust– or Dad.

CRT televisions faded into history, but fluorescent lights continue to be my bane.  Our kitchen is equipped with dimmer switches.  The prison-style bare bulb fixture in our bathroom is too fragile to support heavy CFL bulbs.  Some fixtures require screw base bulbs, others have bayonet, candelabra or T-50 floodlight sockets.  Until recently only one style of CFL light bulbs was available in Ireland, so we installed these into as many fixtures as possible.  The CFLs in recessed sockets overheated and the ones we installed in the cool damp bathroom lasted only a few months.  The ones on the dimmer switch didn’t work at all.  Soon I had a collection of dead CFL light bulbs, waiting for the environment minister to devise a disposal plan for the toxic mercury inside them.  His eventual plan was for citizens to ‘look it up on the Internet’– so here I am. Meanwhile, this became one of the first countries in the world to ban incandescent light bulbs.  Am I screwed?

How do ESL lights work?

ESLs work just like the Cathode Ray Tube (CRT) in Dad’s old TV.  There are differences but let me first explain how a CRT works.  Inside the fragile glass neck there is a piece of metal called a cathode.  The cathode is electrically heated with a filament similar to those used in incandescent bulbs. This allows electrons to ‘boil’ off of the metal’s surface.

These electrons won’t go far unless you remove the air and push many more electrons onto the cathode, giving it a negative charge.  Since like charges repel, the negative electrons leave the cathode and fly towards a positively charged piece of metal near the front of the tube called an anode. This assembly is called an electron gun.

Where Do the Electrons Go?

Once you have electrons shooting out of an electron gun, you need to give them a target. In an X-Ray machine the target is a chunk of metal which stops the electrons and forces them to give up their energy as X-Rays.  In a CRT, the electrons strike a phosphorescent powder, causing it to glow.  Electromagnets sweep the electron beam back and forth over the screen, painting a picture.

In a color CRT, three electron beams pass through a metal shadow mask, full of holes which direct the beams to red, green and blue phosphor dots.

There is Nothing Wrong With Your Television Set

During our TV repair years, my brother and I would occasionally find one with bad horizontal and vertical oscillator tubes.  This disabled the beam steering magnets which left an extremely bright dot shining in the center of the screen.  ESLs don’t use a shadow mask or beam steering magnets but they do have an electron gun and a bright phosphor screen.  Vu1 has taken advantage of advancements in phosphor chemistry and small, high voltage power supplies to make what appears to be an ecologically friendly light..

What about X-Rays?

One of the first things I thought of when I heard about ESLs was, I thought we were trying to get rid of CRTs.  My second thought was, What about X-Rays? In 1967 a General Electric manufacturing defect resulted in TVs which emitted 10-100,000 times the X radiation considered safe.  Most TVs gave off some X-Rays, color ones more so, because the electron accelerating voltage was higher, at about 25,000 volts.  The shadow mask stopped some electrons, converting their energy to X rays.  To filter these, old TV screens were made of thick leaded glass.

ESL’s lack of a shadow mask and relatively low accelerating voltage of 5000V means they are unlikely to emit many more X-rays than a typical CFL bulb and nowhere near as much as the sun.)  ESL lights have passed Underwriter’s Laboratory X-Ray testing in the U.S.

Throw Them in the Trash? You must be joking!

A child with old cathode ray tubes in New Delhi

There is an old joke that fluorescent lights don’t give off light, they suck up dark and the tube gets black when it’s full of dark.  But they’re actually mercury vapor discharge lights.  A tiny heater boils a little bit of mercury, then 100-1000 volt ‘spark’ is sent through the vapor.  The resulting light has some orange, a lot of green and a strongly ultraviolet component.  A fluorescent phosphor coating converts the UV to white light.  The mercury in CFLs does create a disposal problem which, along with previously mentioned advantages seems to give ESLs the edge.

But I wonder why we didn’t worry about long tube fluorescents which had much more mercury and sometimes even a little bit of radioactive Krypton in their starters. One reason may be that we weren’t as environmentally aware, another is that those lights seemed to last forever.  When they flickered, someone would replace the ballast transformer and they’d continue to shine.  I suspect most of my CFL duds have a perfectly good tube and a failure somewhere in the ballast or equivalent electronic components.  The bare mercury tube and electronics have independent failure modes so why are they not independently replaceable?

From Cradle to Where?

So which is more dangerous, phosphor dust or mercury?  Shards of glass imploding through a high vacuum or radioactive Krypton?  I don’t know.  But it bothers me that anyone is suggesting that a new technology is “trash bin safe.”  The Wall Street Journal estimates that there are about 12 billion light bulbs in the world.

A back-of-the-envelope calculation based on 8 hours of light/day and a typical lifespan of 6000 hours gives a replacement interval of 750 days.  ESLs are longer and heavier than CFL or incandescent bulbs.  They weigh about a pound so that would come to 16 million pounds of e-waste per day.  Some jurisdictions forbid disposing of CRTs and if Canada’s $0.25 per pound e-waste charge is typical, ESL disposal could cost the world millions of dollars per day.

I Take My Europium, Shaken, Not Stirred, and Very Very Rare

Vu1’s SEC filing says that their blue and green phosphors are zinc based and that the red phosphor, necessary for ESL’s warm reddish-yellow light, is based on the rare-earth element Europium (Eu).

Grab a magnifying glass and have a close look at your computer’s LCD screen here:    . . . . . . . . . . . .

Those tiny red squares glow with the light of Europium.  Grab a Euro note and you have some Europium.  But if you’d invested in Europium rather than Euros, you’d be up about 1000%, the price of this rare-earth has soared to over $3000/kg.  Pure europium costs upwards of $1,300,000/kilogram.

The thing about rare-earths is that they’re– well, rare.  There are only about 150,000 tons of europium in the world. If that sounds like a lot, consider this.  If ESLs were made of pure europium, we could throw away the entire world’s supply in 18 days.  If container ships burned europium instead of oil, a single ship could use up the global supply in less than two years.

So you really don’t want to be throwing europium in the trash can.  In fact the two best places to mine rare-earths are China and waste electronics heaps.  It would be much better if ESLs were designed for repair.  Most of the parts in dad’s old TV were replaceable.  When the picture tubed dimmed, you would take it to be rejuvenated.

A high voltage would shake the dust from the cathode and it was as good as Frankenstein’s monster after a lightning bolt.  Years later when the tube failed again, you might have the electron gun rebuilt.  As long as fluorescent tube-wielding teenagers like me didn’t go near it, TVs could be repaired indefinitely. In fact a few 1940s televisions continue to operate today.

ESLs are an amazing technology and I can hardly wait until they become widely available in Europe and the Middle East.  I’d like to see them replace most kinds of compact fluorescent bulbs, but I hope the manufacturer rethinks the end-game.

They’re too amazing to end up in the trash can.

Photo credits: Admiral TV photo by puuikibeach via Flickr.
Compact Fluorescent spectrum photo by Brian Nitz
CRT image created by Søren Peo Pedersen via Wikipedia
Photo of  child with old CRTs by Thousandways via Wikimedia CC-BY-SA-2.5

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]]> https://www.greenprophet.com/2012/03/esl-cfl-mercury-lights/feed/ 14 https://www.greenprophet.com/2012/02/recycled-tea-strainer-lamp/ https://www.greenprophet.com/2012/02/recycled-tea-strainer-lamp/#comments Thu, 16 Feb 2012 19:38:37 +0000 http://www.greenprophet.com/?p=66097 As an alternative light fixture, Israeli designer Marina Rudinsky lights up a string of loose tea strainers. Items found in the kitchen are often endowed with unusual shapes and holes, and many a designer have found ways to convert kitchen tools into light fixtures.  Pasta strainers are an obvious choice, but small, delicate loose tea […]

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]]> As an alternative light fixture, Israeli designer Marina Rudinsky lights up a string of loose tea strainers.

Items found in the kitchen are often endowed with unusual shapes and holes, and many a designer have found ways to convert kitchen tools into light fixtures.  Pasta strainers are an obvious choice, but small, delicate loose tea strainers pose a good option too and Israeli designer Marina Rudinsky has assembled them in a luminous fashion.  (Tea paraphernalia has been upcycled in other ways as well, with tea wrappers being masterfully crafted into origami pieces.)

Filled with small white Christmas lights and strung together in a cluster, the tea strainers are then hung from a small free-standing stand.

The lamp almost looks like a dangly pearl earring, or as though all the tea strainers are seeping in one glowing, communal mug.

If the lights used to fill the strainers were energy efficient LED lights, Rudinsky’s tea strainer lamp would make an even eco-friendlier gift.

Marina Rudinsky is a designer and art director, who describes herself as loving strong colors, happy people and big animals.

: Marina Rudinsky

Read more about other eco-friendly light fixtures:
Lightexture Lamps Combine Ethereal Light and Energy Efficiency
Lamps Made with 50% Sawdust, Some Plastic Bags, and Some Ingenuity
Hasadna Design Workshop Does Upcycled Chandeliers With an Ice Cream Party

 

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]]> https://www.greenprophet.com/2012/02/recycled-tea-strainer-lamp/feed/ 1 https://www.greenprophet.com/2011/12/new-uses-light-bulbs/ https://www.greenprophet.com/2011/12/new-uses-light-bulbs/#comments Sat, 17 Dec 2011 16:08:04 +0000 http://www.greenprophet.com/?p=60814 Just because incandescent light bulbs are less energy efficient than CFLs doesn’t mean you need to toss them.  Upcycle them! IKEA Israel won’t even sell incandescent light bulbs any more, and people are gradually switching to more energy efficient compact fluorescent lightbulbs (CFLs).  No need to toss the baby out with the bathwater, though – […]

The post Light Bulb Terrarium and 5 New Uses For Old Light Bulbs appeared first on Green Prophet.

]]> Just because incandescent light bulbs are less energy efficient than CFLs doesn’t mean you need to toss them.  Upcycle them!

IKEA Israel won’t even sell incandescent light bulbs any more, and people are gradually switching to more energy efficient compact fluorescent lightbulbs (CFLs).  No need to toss the baby out with the bathwater, though – those incandescent bulbs can still be useful. Read on for 5 great ways to turn those old bulbs into something new – including a how-to tutorial on making a light bulb terrarium.

1. Upcycled Light Bulb Terrarium

As shown in the photo above, a light bulb terrarium is literally a green way to reuse an old incandescent bulb.  These small terrariums are a bright gift idea and are perfect for decorating a desk, shelf, or window sill.  Check out instructions on how to pull this off at Instructables.

2. Light Bulb Christmas Ornaments

Ho ho ho and and an old halogen light bulb (or other form of incandescent bulb).  With the Christmas season upon us, some upcyclers may be looking for ways to make Christmas ornaments.  Light bulbs are easily personalized and decorated with yuletide cheer.  Get some inspiration at Instructables.

3. Converting Light Bulbs into Chemical Glassware

A more scientific project would be to convert your old light bulbs into chemical glassware.  This idea is not new (it was published in Popular Science in 1933, as seen above), but it’s still relevant.  Check out the full instructions at Modern Mechanix.

4. Light Bulb Hanging Vase

Small, clear, and vase-shaped already, old incandescent light bulbs are easily transformed into miniature vases.  You could either build a stand for the bulb, or have it hang with thread or wire.  Place a flower plucked from your garden in the bulb vase, or alternatively you could use it to keep your basil fresh.  Easy instructions can be found at Instructables.

5. Light Bulb Oil Lamp

Brooklyn-based designer Sergio Silva sells similar light bulb oil lamps for a hefty sum, but you can make your own with fairly basic equipment.  Make a single oil lamp or a set of nine as an alternative and upcycled Hannukah menorah.  Learn how at Instructables.

Note: Before attempting any of these projects, make sure that you have safely hollowed out the wiring from the light bulb.

Read more about light bulbs and green lighting:
IKEA Israel Stops Selling Incandescent Bulbs
Don’t Sit Close to Your CFL Lightbulbs, They May Cause Skin Cancer
Shining Your Green Lights, Tips for Greening Your Home Lighting

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]]> https://www.greenprophet.com/2011/12/new-uses-light-bulbs/feed/ 2 https://www.greenprophet.com/2011/11/solar-light-bulbs-brighten-relief-effort-in-earthquake-stricken-turkey/ https://www.greenprophet.com/2011/11/solar-light-bulbs-brighten-relief-effort-in-earthquake-stricken-turkey/#comments Fri, 25 Nov 2011 18:23:27 +0000 http://www.greenprophet.com/?p=58677 Nokero solar light bulbs charge by day and provide hours of light each night for about a year and a half before the battery must be replaced. If only every relief effort were this sustainable. More than one thousand ShelterBox relief kits have been sent to southeastern Turkey since a 7.2-magnitude earthquake struck the province […]

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]]>

Nokero solar light bulbs charge by day and provide hours of light each night for about a year and a half before the battery must be replaced.

If only every relief effort were this sustainable.

More than one thousand ShelterBox relief kits have been sent to southeastern Turkey since a 7.2-magnitude earthquake struck the province of Van one month ago. Each kit contains five Nokero-brand solar light bulbs of the type pictured above, which can be hung so that the miniature solar panel faces the sun.

Greener and more reliable

Since the Oct. 23 earthquake and multiple powerful aftershocks, millions of Turks have been left without power in Van. As the days grow shorter, the lack of electric lighting in the region is becoming a more and more serious problem.

British charity ShelterBox is doing its part to help with an ingenious solution: Nokero solar light bulbs. Nokero bulbs are not only completely solar-powered, they are more durable, weather-proof and long-lasting than regular light bulbs, making them ideal for disaster relief situations.

The bulbs can last for 5 to 10 years if properly cared for, and only require a new battery every 1.5 years. Powered by a single rechargeable AA battery, the bulbs maintain charging efficiency even under extreme meteorological conditions.

Why not for everyday use?

The advantages of the Nokero bulbs beg an important question: Why should they only be used in disaster relief situations?

Turkey is a notoriously sunny country, and while major solar power infrastructure will need serious government support to become viable, there’s no reason that Van locals shouldn’t continue to use their Nokero bulbs long after their homes are rebuilt. With a retail price of $20 each, in fact, there’s no reason that anyone living in a sunny clime shouldn’t invest in one for a porchlight or other nighttime outdoor lamp.

A more sustainable future for Van

If there is any bright side to the devastating earthquake that has killed hundreds of Turks and left millions more homeless, it is that the event has provided an opportunity for stronger, more sustainable infrastructure in a part of the country historically neglected by the central government.

By using strawbale building technology, for example, residents of the rebuilt Van could construct houses that are twice as energy-efficient and far more durable than the quick-build, rickety, concrete structures that collapsed in the earthquakes.

:: Earth Techling

Read more about environmentally friendly lighting:

Help Kickstart A Sustainable Lighting Project

Solar Bottle Lights A Bright Idea For The Developing World

IKEA Israel Stops Selling Incandescent Bulbs

Image via Nokero

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]]> https://www.greenprophet.com/2011/11/solar-light-bulbs-brighten-relief-effort-in-earthquake-stricken-turkey/feed/ 7 https://www.greenprophet.com/2011/11/kickstart-sustainable-lighting-project/ Sun, 20 Nov 2011 15:37:40 +0000 http://www.greenprophet.com/?p=58192 Israeli designer Adital Ela Asks for help with her WindyLight sustainable lighting project on Kickstarter. Kickstarting a new sustainable lighting project that employs wind in generating energy to create light is sustainable Israeli designer Adital Ela.  Her project, WindyLight, is a “family of self-sufficient outdoor lights that perform on free, clean energy and create a […]

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]]> Israeli designer Adital Ela Asks for help with her WindyLight sustainable lighting project on Kickstarter.

Kickstarting a new sustainable lighting project that employs wind in generating energy to create light is sustainable Israeli designer Adital Ela.  Her project, WindyLight, is a “family of self-sufficient outdoor lights that perform on free, clean energy and create a unique and sensual illuminating experience.  [The WindyLights] are designed to dance to the rhythm of soft gusts of wind and to provide light even in the urban environment.”

But Ela doesn’t plan on doing it alone and is asking for the public’s support via Kickstarter, an online funding platform that helps get small creative projects off the ground.  You could help fund this project starting at as little as $1.

The WindyLights themselves are small pinwheel-like modules that collect wind energy and convert it into electrical current, allowing the LEDS in the pinwheels to shine through.  The WindyLights are designed with the intention of grouping several pinwheels together to create a bright and beautiful effect.

In Ela’s words, “launching the product will also support us in creating urban lighting installations in prominent locations around the world followed by community activities to stimulate creative thinging towards sustainability design solutions.”

In order to bring WindyLight into the world, she needs to raise $65,000 (and over $12,000 has already been raised over the past 10 days).

Since KickStarter has an “all or nothing” policy, though, the remaining sum must be raised over the next 40 days or none of the backers will be charged at all.  The clock is ticking on WindyLight, and Ela is hoping to appeal to potential backers by offering them either an actual WindyLight, silver brooch, or t-shirt.

To read more about WindyLight and help support the project, visit the WindyLight Kickstarter page.

Read more about sustainable lighting::
Israel Plans Wind-Powered Lighting for Coastal Highway, Takes Initial Step to Buttress Shoreline Cliffs
Solar Bottle Lights a Bright Idea for the Developing World
Don’t Sit Close to Your CFL Lighbulbs, They May Cause Skin Cancer

The post Help Kickstart a Sustainable Lighting Project appeared first on Green Prophet.

]]> https://www.greenprophet.com/2011/10/lamps-energy-efficiency/ https://www.greenprophet.com/2011/10/lamps-energy-efficiency/#comments Mon, 24 Oct 2011 13:48:05 +0000 http://www.greenprophet.com/?p=56074 Lightexture’s lamps are beautiful and energy efficient. Sustainable designers interested in the field of light fixtures often focus on making the lamp base out of recycled or repurposed materials, and don’t necessarily think about energy efficient light.  We’ve seen lamps made out of industrial pipes and chandeliers made out of ice cream spoons, but when […]

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]]> Lightexture’s lamps are beautiful and energy efficient.

Sustainable designers interested in the field of light fixtures often focus on making the lamp base out of recycled or repurposed materials, and don’t necessarily think about energy efficient light.  We’ve seen lamps made out of industrial pipes and chandeliers made out of ice cream spoons, but when thinking of mood lighting it is sometimes hard to think of compact fluorescent lightbulbs (CFLs).  Emitting a notoriously harsh white light when they first came out, CFLs have a bad reputation that is slowly being restored as their glow comes closer to the yellow warmth associated with (non energy efficient) incandescent bulbs.  Israeli design duo Yael Erel and Avner Ben Natan of Lightexture are helping the CFLs’ popularity by creating beautiful lamps in which they shine.

Yael and Avner, of Lightexture

Coming from two different fields – Yael is an architect while Avner is a lighting designer – these designers wish “to explore light through the construction of unique designer lamps which adjust through time, and draw light and texture in space.”

[youtube]http://www.youtube.com/watch?v=AVxl-Lm8tTA[/youtube]

Creating textured light that is more noticeable than an invisible and pervasive light, Lightexture’s lamps and light fixtures are made from various ready-made objects (such as strainers and cheese graters), lighting components and constructed elements.

The team’s Clayight and Earthlight series, which they developed through collaboration with ceramic artist Sharan Elran, focuses on sustainable light that is eco-friendly and atmospheric.  The materials used to create these lamps are natural, such as in the ceramic Totem lamp at the top of this post or the rice paper used in the Earthlight Seedlamp above.

These lamps are also intended to be fitted with CFLs, which can surprisingly create this beautiful yellow glow due to the design of the lamp itself.

“One of our goals,” write the Lightexture duo, “is to create energy efficient fixtures, while maintaining our focus on their atmospheric and spatial performance.”

::Lightexture

Read more about sustainable lamp designs:
Hasadna Design Workshop Does Upcycled Chandeliers With an Ice Cream Party
Tel Aviv Port’s “Pop-Up Design Store” Features Many Upcycling Designers
Cygalle Shapiro Creates LED Lamp Powered Organically… By Tomatoes

The post Lightexture Lamps Combine Ethereal Light and Energy Efficiency appeared first on Green Prophet.

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