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.
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.