LED technology offers many advantagesJohn Moot
LED technology has become indispensable in the world of lighting, as it offers so many convincing advantages that no one can ignore it. With their luminous flux, LED lamps can replace all luminaires today – from outdoor luminaires to ceiling luminaires and wall luminaires.
And in addition, many LED lamps are also dimmable, so that users can adjust the brightness of their spotlights themselves.
With LEDs, savings can be made because energy consumption is 90 percent lower than with incandescent lamps. LEDS are an energy-saving lighting solution that does not use any mercury at all and, thanks to their long life, produce little waste. They are also long-lasting (LEDs have a life of up to 50,000 hours).
LEDs are much more efficient than traditional forms of lighting, yet they generate heat. This heat can have a negative effect on the LED and must therefore be dissipated to ensure that the benefits of this technology can be realised.
If excessive temperatures are reached in the structure of the LEDs, especially above the maximum operating temperature of the LED (~120-150˚C), effects can occur that lead to a complete failure of the illuminant.
The operating temperature is directly related to the service life of the LED; the higher the temperature, the shorter the service life of the LED.
As heat is dissipated from a component to the environment at its surface, the dissipation rate increases with the surface.
Cooling concepts for LEDs
This is where heat sinks are used. Heat sinks can be designed to provide a significantly increased surface area to maximize heat dissipation. Heat sinks are often used in LED applications and are attached to the back of the component. Ideally, the transitions should be completely smooth to improve the efficiency of heat dissipation. This is normally not possible. As a result, air gaps occur at the junction of the component and the heat sink, which significantly reduces the efficiency of heat transfer.
Selecting the correct thermally conductive material
There are many ways to improve the thermal management of LED products. Therefore, the right type of thermally conductive material must be selected to ensure that the desired results in heat dissipation are achieved. Dr. Dietrich Müller GmbH provides support in the selection of suitable materials.
The thermally conductive materials offered by Dr. Dietrich Müller GmbH offer different approaches to solve this problem:
The Thermigrease thermally conductive greases are a popular material to dissipate the heat, but also the Thermiflex thermally conductive films and the Thermipad thermally conductive gap pads are used.
The Thermiglue product range, which is a wide range of thermally conductive adhesives, is also used in LED applications.
Die-cut parts made of thermally conductive material
Dr. Dietrich Müller GmbH has all the processing methods at its disposal to supply the required die-cut parts (on rolls, in magazines or as individual parts).