Home

Nano engineering to create a new generation of incandescent lamp energy efficiency higher than fluorescent and LED lamps

2017-08-17

Traditional incandescent bulbs are facing the fate of being eliminated in recent years because of their low energy efficiency and have been gradually replaced by more energy-saving or environmentally friendly bulbs such as LEDs. If the incandescent lamp is used for a long time, it will be very hot if you unscrew it from the screw. Tungsten filament bulbs use the principle of electricity and resistance to heat the fine tungsten filament to about 2700 ℃, making it emit hot light. However, in the whole process, 95% of the energy will be converted into heat, while the energy benefit of tungsten filament bulbs is only 5%, which is really wasteful. In contrast, the energy efficiency of LED bulbs and energy-saving lamps can reach 14%. MIT

Nano engineering to create a new generation of incandescent lamp energy efficiency higher than fluorescent and LED lamps

If the incandescent lamp is used for a long time, it will be very hot if you unscrew it from the screw. Tungsten filament bulbs use the principle of electricity and resistance to heat the fine tungsten filament to about 2700 ℃, making it emit hot light. However, in the whole process, 95% of the energy will be converted into heat, while the energy benefit of tungsten filament bulbs is only 5%, which is really wasteful. In contrast, the energy efficiency of LED bulbs and energy-saving lamps can reach 14%.

The Massachusetts Institute of Technology (MIT) has developed a new way to improve tungsten light bulbs. It surrounds the filament with a special crystal structure, trapping the heat and invisible infrared radiation that will be taken away, and allowing our visible light to pass through, thus greatly reducing energy loss. Finally, the energy efficiency of tungsten light bulbs can be increased to 40%.

In this way, to win the current energy-saving lamps and LED lamps, we should know that the European Union banned the sale of tungsten filament bulbs in 2012. Worldwide, countries have begun to legislate to pay attention to lighting energy efficiency standards since 2007, which has also affected the development of the entire lighting industry. Manufacturers have defected to the camp of fluorescent lamps and LED lamps, and incandescent lamps have gradually withdrawn from people's sight. If this new type of incandescent lamp comes out, it will greatly reduce the electricity bill of the family. For a 60W light bulb, the electricity consumption only needs a few dollars a year, which may be another dramatic change.

After incandescent lamps withdrew from people's field of vision, they have been appearing as "nostalgic" lighting in recent years. A few manufacturers have successfully developed products similar to incandescent bulbs, but they use fluorescent lamps or light-emitting diode technology to imitate incandescent lamps. And the internal tungsten structure, but it is only similar in appearance, and the internal is still changed.

On the spectral energy diagram, the right side of the red color emits heat that is invisible to visible light. MIT's method is to return the energy on the right to emit light.

Crystal filter: Researchers add a structure made of photonic crystals around the filament to capture the excess radiation generated by the filament and reflect it back to the filament for absorption and emission again in the form of visible light. The difficulty of this technology lies in finding suitable materials that can reflect radiation and allow visible light to penetrate.

In fact, this idea is the same as that of halogen lamps. The rare gas is used to make the tungsten wire recover more heat to emit light again. From gas to solid, this is just an expansion of the idea, or a return to basics.

None

Discussion on the Core Problems of LED Lighting Power Supply Design