A research team of State Key Laboratory of Ultra-precision Machining Technology (Partner Laboratory in The Hong Kong Polytechnic University) and PolyU students has successfully developed the most energy-efficient Light Emitting Diode (LED) filament technology with a luminous efficacy of 129lm/W, which represents 1.5 times the efficacy of traditional LED lamps, surpassing all other general lighting tools available in the market. In 2015, PolyU Micro Fund awarded a seed fund of HK$100,000 to the student team and it is expected that the product can be launched this year.
This LED filament technology has excellent energy efficiency. Based on the assumption of a daily operation of eight hours, a PolyU's LED filament bulb with lumen of 1300lm costs HK$33 of electricity tariff per year, and contributes to 22kg of carbon dioxide emission yearly. In comparison, a traditional LED lamp costs HK$47 of electricity tariff and 31kg of carbon dioxide emission yearly with the same lumen and conditions, which means that the new technology can reduce carbon dioxide emission by 30%. Besides, the new technology enables an expected lifetime of 50,000 hours, with only half of the production cost of traditional LED lamps.
Thanks to its energy-saving and long lifetime features, LED lighting contributes significantly to sustainable development. However, the limitations of traditional LED lamps, including high production cost and narrow beam angle have affected its popularity. The LED filament technology developed by PolyU has not only achieved breakthrough in the areas of energy efficiency, lifetime, and production cost, but it also has other advantages including:
These breakthroughs are made possible by the following technology advancement:
The patent application of this new technology has been filed and the prototype design is completed. In future, the team will conduct various tests and obtain certifications for market launch.
 The amount of seed fund offered by PolyU Micro Fund has been increased to $120,000 since 2016
 HK$1.14 per kWh
Associate Head, State Key Laboratory of Ultra-precision Machining Technology (Partner Laboratory in The Hong Kong Polytechnic University)
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