Why LED lights matter

Recently, the Royal Swedish Academy of Sciences awarded the Nobel Prize in physics to the minds behind new energy-efficient and environmentally friendly lighting. Three scientists – Isamu Akasaki, Hiroski Amano and Shuji Nakamura – were recognised for “the invention of efficient blue light-emitting diodes, which has enabled bright and energy-saving white-light sources.”

Blue light-emitting diodes (LEDs) have fundamentally transformed lighting around the world, from lamps and televisions to smart phones and other devices. The Nobel Assembly called them “revolutionary,” stating in the prize announcement that “incandescent light bulbs lit the 20th century; the 21st century will be lit by LED lamps.”

On a first read, that sounds like hyperbole – but it’s really not. Here are three reasons why blue LEDs have proven to be such a transformative technology:

Modern, white LED lamps – which were invented after and because of blue LEDs – have come to exemplify technology that can be both hyper-efficient and made to last.

To put white LEDs in perspective, we can benchmark them against other common light sources, such as compact fluorescent (CFL) and incandescent light bulbs. A simple way to compare their efficiencies is by measuring how much light they put out (measured in “lumens”) for every unit of electrical power pumped into them (in watts).

The best white LEDs generate about 300 lumens for each 1 watt input – far more than CFLs (70 lumens per watt) or incandescent bulbs (just 16 lumens per watt). And with approximately one-fifth of the world’s electricity consumption going toward lighting, that huge bump in efficiency could make a huge environmental impact.

Equally impressive is how long LEDs last: up to a staggering 100,000 hours, which vastly exceeds the 10,000 hours for CFLs and 1,000 hours for incandescent bulbs. According to the Nobel announcement, LED lamps have the potential to provide light for 1.5 billion people around the world who do not currently have access to the power grid.

How is that possible? Because LEDs are so astonishingly efficient. Their low energy requirement means that cheap, local solar panels can often easily generate enough juice to power LEDs.

While the scientists behind blue LEDs are only being recognized with a Nobel now, their invention has already made a tremendous impact around the world.

In Japan –  where Akasaki, Amano, and Nakamura were born — commercial LEDs have already taken off. In 2013, sales hit $5.2 billion, and LEDs accounted for 30 percent of all Japanese bulbs. Countries in Southeast Asia, such as Thailand, are seeing similar gains. And in India, which is planning a national roll out, experts estimate that LEDs are poised to save more than 50 terawatt-hours every year and cut consumer bills by nearly $4 billion.

 

When you combine LED roll outs with other energy efficiency efforts already being deployed, the results can be tremendous. Just look at Japan –  in three short years, the nation’s largest utility has replaced nearly 50 percent of its nuclear capacity through energy efficiency and other conservation efforts. 

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