Thanks to a small improvement, a team from MIT might make much more effective than the LED filament bulbs.
Since that they illuminate our lives, LEDs are reaping as much praise as criticism. With the energy savings they generate and their very long life, they had priori everything to please. But it was without counting on the appearance of the first doubts about their effectiveness, followed by the reluctance of communities to invest, the evocation of “diseases of youth”, or even change they cause in lighting at the movies.
Today, the invention of the scientists from the MIT (Massachusetts Institute of Technology) could simply store them in the closet… in favor of good old incandescent bulbs. Finally almost. Soljacic, Joannopoulos, and Davis teachers have developed a new ‘recycling of light’ function for these bulbs once accused of losing too much.
How does it work?
Into a filament bulb, light springs from the heating of a wire… Where the energy loss. The team from MIT has proven in his study published in Nature Nanotechnology, that fix a crystalline structure around the filament allows the energy to bounce there.
“This recycle energy that would otherwise be lost,” says Professor Soljacic. Ordinarily, a filament bulb is only 5% effective, since 95% of its energy escapes into the atmosphere. In comparison, the LEDs are 14% effective. Version 2.0 of the incandescent light bulb of the MIT could be 40% effective, support its creators.
“This prototype is a proof of concept, we are at the moment only the bottom of what it will be possible one day to,” says Professor Soljacic.
“The peculiarity of this bulb, it’s that it reached an almost ideal color rendition”, still boasts the Professor Soljacic. “‘”. ” This is precisely the reason why incandescent bulbs prevailed for so long “, he explains.
Actually, who prefers dull led and fluorescent lighting in the warm light of an old bulb? From a more pragmatic point of view, this blue light is accused of several ailments. For example, energy levels of its wavelengths can damage the retina. Alternatively, exposure to many blue light sources on a daily basis would alter our circadian rhythm, and we prevent sleep.
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