Using these LED exterior eyelid bulkhead lights is easy. First, make sure you hire a licensed electrician to install them as there are electrical components involved. The installation instructions are in each product box. These lights are designed for outdoor use, but if the area has harsh weather or heavy rainfall, make sure they are protected or choose a fitting with a proper IP rating. They are not suitable for use with dimmers, but you can use them with 2 - way switching and PIR or Microwave sensors. For maintenance, simply clean the lights with a soft, dry cloth from time to time. Keep them in an ambient temperature between -20 to 40°C. With a 2 - year replacement warranty, you can use them with confidence.