Optical Coatings Separate Light from Heat: Return of Incandescent Light Bulbs (Axil Axil)

Here is an introduction to the Nature Article
Tailoring high-temperature radiation and the resurrection of the incandescent source:
http://www.nature.com/nnano/jo…/full/nnano.2015.309.html

According to sketch c the design looks similar to that of a projector lamp but the flat filament package is enclosed by one IR reflector on each side. One problem that this design appears to have is that the filament must be just as warm as in a standard lamp in order to emit light of the required spectrum.

The main reason that incandescent lamps have limited life span is that tungsten evaporates from the filament. This evaporated metal will plate the inside of the lamp making it less efficient but not very much since the metal will be spread out over a fairly large surface area. With the proposed design the area that collects the tungsten seems to be much smaller which will impede the light flow more. And life span would still be an issue.

The problem of lamp dimming is solved in a halogen lamp where escaped tungsten atoms are brought back to the filament, but not to the place where they came from and eventually the filament will break all the same.