Using these PLANA exterior wall lights is easy. First, make sure you've got a licenced electrician to install them as required by the warranty. The lights work with a wide input voltage, so they can be used in many places. You can swivel them 180 degrees to direct the light where you need it. They're not for dimming, but they support 2 - way switching and can be paired with a PIR sensor for added convenience. When it comes to the environment, they can handle temperatures from -20 to 50°C. To keep them in good shape, clean the UV - resistant PC diffuser gently with a soft cloth. Avoid using harsh chemicals. Since they have an IP65 rating, they can withstand outdoor conditions, but still, check the housing and back plate for any signs of damage periodically. If you have any problems, you've got a 3 - year replacement warranty, so don't hesitate to contact the seller.