The use of LED lamps has many advantages like low power consumption, long lifetime and robustness. However, there are also detrimental effects to the use of these lamps. For production, rare toxic elements are required, which can be harmful to global environment. It is neccessary to spend these materials in this case Gallium wisely. To gain access to these substances in a device and to determine the amount of these rare materials a cross section is made through the active component. In this case, the sample is cured in an epoxy. Then it sawed and polished. Now the sample can be viewed in detail and analyzed with an optical microscope or an electron microscope. EDX analysis is performed to quantify the amount of Galliumnitride.