Light Emitting Diode (LED) lighting is known for its energy-saving and long lifetime features. However, the limitations of traditional LED lamps, including high production cost and narrow beam angle, have affected its popularity. In view of this, a research team from PolyU’s State Key Laborary of Ultra-Precision Machining Technology has developed a new LED filament technology together with the University’s students. Achieving an expected lifetime of 50,000 hours for only half of the production cost of traditional LED lamps, the new technology’s energy efficiency surpasses the lighting tools available in the market.
The research team selected aluminum as the substrate material since it has good thermal conductivity, high reflectivity and affordable price, so as to achieve longer lifetime and high lumen at a lower cost. By mounting multiple tiny LED chips with small power on both sides of the substrate, energy loss can be effectively reduced and light diffusion can be evenly generated.
Researchers also applied advanced injection moulding technology to produce a seamless and transparent spherical plastic case, making possible a 300-degree wide beam angle. In addition, the LED filament lamp produced by PolyU can convert AC (alternate current) to low current DC (direct current) directly. This will help simplify circuits and reduce the components required, enhancing the reliability and efficiency of the lamp.
The patent application of this new LED filament technology has been filed and the prototype design was completed. Looking forward, the research team planned to conduct tests and obtain certifications for market launch. Details>>