O. ILIC ET AL./MIT
Peter Bermel , Gang Chen, John D. Joannopoulos ,Ivan Celanovic and Marin Soljačić from MIT published a letter in Nature Nanotechnology pre-anouncing work they have been doing with an efficient incandescent lightsource
The basic principle is using nanotechnology reflectors to return the non visual radiation, specifically IR to the emitting filament that is optimised to reabsorb the energy to emit as light in the visible spectrum.
The experimental solution delivers light at around 3,000K and the technology is predicted to deliver an absolute efficiency close to 40% when developed compared with conventional incandescent at 2% fluorescent between 7% and 13% and LED between 5% and 15%.
From the article I would expect this solution to be highly efficient at full output, however it may be challenged by dimming. I really hope that this develop,ent achieves sufficient commercial support to make it out of the lab and into the market. The evidence is clear that the natural light quality delivered by incandescent sources is much appreciated by people. The number of “loophole” based lighting solutions in bars and restaurants since the advent of the incandescent ban proves that the qualities of this light is very appealing.
The main risk to these developments are regulatory developments particularly in Europe that will limit the ability to market new technologies such as this in the early stages where efficiencies will be lower and prices higher than current LED. As we stand now it is likely that, had we been facing such demanding energy efficiency goals 15 years ago when LED first appeared in the lighting market it is unlikely we would have seen the development expenditure and advances we have seen in the past 15 years. We must avoid a regulatory situation that stunts the growth of new technologies and developments.
Kevan Shaw 12 January 2016