Efforts to improve efficacy thumb|upright|Xenon halogen lamp with an E27 base, which can replace a non-halogen bulb Some research has been carried out to improve the efficacy of commercial incandescent lamps. In 2007, General Electric announced a high efficiency incandescent (HEI) lamp project, which they claimed would ultimately be as much as four times more efficient than current incandescents, although their initial production goal was to be approximately twice as efficient. The HEI program was terminated in 2008 due to slow progress. US Department of Energy research at Sandia National Laboratories initially indicated the potential for dramatically improved efficiency from a photonic lattice filament. However, later work indicated that initially promising results were in error.
efforts to improve efficacy thumb|upright|xenon halogen lamp with an e27 base which can replace a non-halogen bulb some research has been carried out to improve the efficacy of commercial incandescent lamps in 2007 general electric announced a high efficiency incandescent (hei) lamp project which they claimed would ultimately be as much as four times more efficient than current incandescents although their initial production goal was to be approximately twice as efficient the hei program was terminated in 2008 due to slow progress us department of energy research at sandia national laboratories initially indicated the potential for dramatically improved efficiency from a photonic lattice filament however later work indicated that initially promising results were in error