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.