of the key points in the design with LEDs.
The temperature has a great influence on the light output of an LED. Where: The colder the environment, the more efficient the LED works. Cold locations you come to meet, therefore,
why LEDs can be used in outdoor lighting or as a light source for cabinets particularly efficient.
High temperatures, however, have a negative effect on the light output. The service life may be shortened. Reputable manufacturers provide for their LEDs at an ambient temperature, are achieved in the luminous flux and lifespan of your LED lights and modules.
Unlike incandescent or halogen lamps emitted light from an LED is not warm, but as with other lamps also set diodes only part of the energy into light - is created within the semiconductor heat. This heat must necessarily be removed so that the LEDs operate as efficiently as possible and achieve long life. This is especially true for LEDs that operate with high operating current.
LEDs do not fail out suddenly. Their light intensity decreases with the time. The lifetime (L) of an LED must therefore be defined for each application. The end of life is reached when the LED is only 70 percent (L70) or 50 percent (L50) emits the light flux was measured at the beginning. The life of an LED is strongly dependent on the ambient and operating temperature. The chart shows: If the LED at a higher temperature (see Tc1) or operated with poor thermal management, shortens its operating life.
Different types of "cooling" (heat
For heat dissipation provides the so-called thermal management. The heat is dissipated through board and lamp housing (= passive cooling). A large-scale, fixed connection between the circuit board and housing aids in heat dissipation. In some lighting models bigger fin surface, thereby reducing the temperature at different building types and air or water cooling (= active cooling) are used. The optimal cooling, however, provides for high performance LEDs currently passive 2-phase hybrid cooling. This form of cooling transmits the heat through evaporation and condensation of a working medium in a vacuum. Thus, the heat dissipation compared to copper and aluminum heat sinks is increased by 100 times. As a result, lights can be operated at higher ambient temperatures and with considerably longer.