As is known to all , one of the advantages of LED is that it has a high efficiency of photoelectric conversion , which has been greatly improved compared with the traditional light source . However , due to the limitations of current technology development , the efficiency is probably only 15-20% , which means that the power of up to 80-85% is converted into heat . Therefore , the problem of heat dissipation is always an important challenge to LED lighting . Such Mao Yuhai , a retired professor at Tsinghua University and a consultant at PAM in the United States , says the main challenges facing LED heats dissipation are high power street lamps , and the heat of the stadium and the high luminance lights of the stadium . Because of the high power , the heat dissipated is also large , and in the open air facing a variety of hot and sunny weather , increasing the difficulty of heat dissipation . The high brightness spotlight of the theater is also one of the difficulties . In addition , high-power PAR38 lamp due to small size , power , the requirement of no electromagnetic interference also increases the difficulty of heat dissipation . Such There are many kinds of heat dissipation solutions to LED cooling , including aluminum fins , thermal conductive plastic shell , fan , heat pipe , surface radiation heat dissipation treatment and so on . Among them , radiator and high-speed fan are the most common treatment methods . However , with the increasing demand for light output for lighting applications , the heat flux of LED products is increasing , and the heat of cool in unit time is increasing . Therefore , Jin Hailin , head of Nuventix Asia Pacific technology supports , pointed out that the biggest challenge is to reduce the increasing heat flux . It Advanced technologies such as piezoelectric ceramic fan and fan blade fan has strong heat dissipation capacity , but it is not suitable for the application of LED lighting in such small space as size volume , power consumption , cost , structure , scale production and so on . Such Jin Hailin analysis , because the passive radiator is restricted to the limited heat transfer capacity , the energy taken away in a unit time is very limited , making the radiator used to cool the high power LED module has to be very heavy . The active heat dissipation (such as the SynJet heat dissipation scheme ) can overcome these shortcomings . Through the forced convection heat transfer efficiency , the heat can be taken away quickly , the temperature of the LED chip is reduced , and the volume and weight of the radiator is reduced at the same time , and the need for the miniaturization of the lighting design is better .