Compared with traditional light technologies, LED solid source has high luminous efficiency, pure color, low power consumption, long service life, high reliability, flexible in applications, zero contamination. Currently LED light technology has been widely used in road lighting, residential lighting, vehicle lighting and outdoor landscape lighting areas. Good heat dissipation capability is a basic guarantee for the performance and reliability of LED lamps. Working temperature has significant influences on LEDs’ performances, including changes of color temperature, red shift of wavelength, decline of efficiency, etc. Therefore, good LED lighting devices must be equipped with good heat control systems. In this article, we will discuss about advantages of the vertical heat dissipation mode in small and medium power LED lights. Compared with traditional cooling modes, LED lamps, especially small and medium power LED lights using vertical heat dissipation modes have features of high brightness, fast cooling, low light attenuation, low production cost, reliable. Vertical heat dissipation mode is, can be said, a developing trend of LED lighting industry.
This article will compare new vertical cooling mode with traditional horizontal cooling mode through comparisons between commonly used 3014 LED and 3528 LED respectively. 3528 LED chips realize cooling effects through electrodes weld legs at both ends of electrodes. Thus they use horizontal cooling mode. 3014 G24 LED chips conduct heat through metal substrates, which is vertical cooling method.
In order to calculate the thermal resistance more accurately, we firstly set the temperature parameter of substrates as 60℃, chip power as 0.06W, the thickness of solid crystal glue is KER-3200-TI is 0.01mm, the driving current is 20mA. According to the analysis of ANASYS (a type of finite element analysis simulation software), in the same working condition: set as above, the working temperature of vertical cooling mode is higher. This is mainly because that the volume and cooling area of 3014 is much smaller than that of 3528, in which the heat is more concentrated. But the temperature difference of vertical cooling mode is smaller, resistance of which is far lower than LED chips using horizontal cooling method. In other words, the cooling effect of vertical cooling mode is more advance than that of horizontal cooling mode.