Using these HEKA exterior wall lights is easy. First, have a licenced electrician install them according to the instructions in the box. Connect them to a power source within the 100 - 240V AC 50/60Hz range. They are not suitable for use with dimmers, but can be used with 2-way switches or PIR/microwave sensors. When it comes to the environment, they can work well in temperatures from -20 to 50°C. For maintenance, regularly check the aluminium housing and PC diffuser and back plate for any damage. If there are any problems, refer to the 3-year replacement warranty. Also, always ensure the IP rating is appropriate for your use to avoid disappointment and warranty issues.