Featured Research

from universities, journals, and other organizations

LEDs promise brighter future, not necessarily greener

Date:
August 24, 2010
Source:
DOE/Sandia National Laboratories
Summary:
Solid-state lighting pioneers long have held that replacing the inefficient Edison light bulb with more efficient solid-state light-emitting devices (LEDs) would lower electrical usage worldwide, not only "greenly" decreasing the need for new power plants but even permitting some to be decommissioned. But, in a new paper, leading LED researchers argue for a shift in that view.

Solid-state lighting pioneers long have held that replacing the inefficient Edison light bulb with more efficient solid-state light-emitting devices (LEDs) would lower electrical usage worldwide, not only "greenly" decreasing the need for new power plants but even permitting some to be decommissioned.

But, in a paper published in the Journal of Physics D, leading LED researchers from Sandia National Laboratories argue for a shift in that view.

"Presented with the availability of cheaper light, humans may use more of it, as has happened over recent centuries with remarkable consistency following other lighting innovations," said Sandia lead researcher Jeff Tsao. "That is, rather than functioning as an instrument of decreased energy use, LEDs may be instead the next step in increasing human productivity and quality of life."

The assumption that energy production for lighting will decline as the efficiency of lighting increases is contraindicated by data starting with the year A.D. 1700 that shows light use has remained a constant fraction of per capita gross domestic product as humanity moved from candle to oil to gas to electrical lighting. Thus the societal response to more efficient light production has been a preference to enjoy more light, rather than saving money and energy by keeping the amount of light produced a constant.

"Over the past three centuries, according to well-accepted studies from a range of sources, the world has spent about 0.72 percent of the world's per capita gross domestic product on artificial lighting," said Tsao. "This is so for England in 1700, in the underdeveloped world not on the grid and in the developed world using the most advanced lighting technologies. There may be little reason to expect a different future response from our species."

Far from an example of light gluttony, Tsao said, by increasing the amount of lit work space and bright time, individuals would enjoy the desirable outcome of increasing their creativity and the productivity of their society.

To the question of how much light is enough, says Tsao, no one yet has produced a gold standard for light saturation levels.

While artificial illumination is considerably better now than decades ago, the researchers write, "People might well choose higher illuminances than they do today, particularly to help mitigate losses in visual acuity in an aging world population." More easily available light also may help reduce seasonal depression brought on by the shorter darker days of winter, and help synchronize biological rhythms, called circadian, that affect human behavior day and night.

As for problems that could occur with too much light -- from so-called 'light pollution' that bedevils astronomers to biological enzymes that operate better in darkness -- Tsao has this to say: "This new generation of solid-state lighting, with our ability to digitally control it much more precisely in time and space, should enable us to preserve dark when we need it." There is no reason to fear, Tsao says, that advancing capabilities "will keep us perpetually bathed in light."

Another paper author, Sandia researcher Jerry Simmons points out, "More fuel-efficient cars don't necessarily mean we drive less; we may drive more. It's a tension between supply and demand. So, improvements in light-efficient technologies may not be enough to affect energy shortages and climate change. Enlightened policy decisions may be necessary to partner with the technologies to have big impacts."

Other authors of this paper are Randy Creighton and Mike Coltrin, both of Sandia Labs, and Harry Saunders of Decision Processes Inc., of Danville, Calif.

The work was supported by Sandia's Solid-State Lighting Science Energy Frontier Research Center, funded by the U.S. Department of Energy's Office of Basic Energy Sciences.


Story Source:

The above story is based on materials provided by DOE/Sandia National Laboratories. Note: Materials may be edited for content and length.


Journal Reference:

  1. J Y Tsao, H D Saunders, J R Creighton, M E Coltrin, J A Simmons. Solid-state lighting: an energy-economics perspective. Journal of Physics D Applied Physics, 2010; 43 (35): 354001 DOI: 10.1088/0022-3727/43/35/354001

Cite This Page:

DOE/Sandia National Laboratories. "LEDs promise brighter future, not necessarily greener." ScienceDaily. ScienceDaily, 24 August 2010. <www.sciencedaily.com/releases/2010/08/100824121028.htm>.
DOE/Sandia National Laboratories. (2010, August 24). LEDs promise brighter future, not necessarily greener. ScienceDaily. Retrieved September 16, 2014 from www.sciencedaily.com/releases/2010/08/100824121028.htm
DOE/Sandia National Laboratories. "LEDs promise brighter future, not necessarily greener." ScienceDaily. www.sciencedaily.com/releases/2010/08/100824121028.htm (accessed September 16, 2014).

Share This



More Matter & Energy News

Tuesday, September 16, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Manufacturer Prints 3-D Car In Record Time

Manufacturer Prints 3-D Car In Record Time

Newsy (Sep. 15, 2014) — Automobile manufacturer Local Motors created a drivable electric car using a 3-D printer. Printing the body only took 44 hours. Video provided by Newsy
Powered by NewsLook.com
Refurbished New York Subway Tunnel Unveiled After Sandy Damage

Refurbished New York Subway Tunnel Unveiled After Sandy Damage

Reuters - US Online Video (Sep. 15, 2014) — New York officials unveil subway tunnels that were refurbished after Superstorm Sandy. Nathan Frandino reports. Video provided by Reuters
Powered by NewsLook.com
Frustration As Drone Industry Outpaces Regulation In U.S.

Frustration As Drone Industry Outpaces Regulation In U.S.

Newsy (Sep. 14, 2014) — U.S. firms worry they’re falling behind in the marketplace as the FAA considers how to regulate commercial drones. Video provided by Newsy
Powered by NewsLook.com
Smart Gun Innovators Fear Backlash From Gun Rights Advocates

Smart Gun Innovators Fear Backlash From Gun Rights Advocates

Newsy (Sep. 14, 2014) — Winners of a contest for smart gun design are asking not to be named after others in the industry received threats for marketing similar products. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins