Using these LED bulkhead lights is simple. First, have a licenced electrician install them following the instructions in the product box. The large terminal holes make it easy to connect the wires. You can use them with 2 - way switching or pair them with PIR or Microwave sensors according to your needs. For maintenance, keep the lights clean. Wipe the frosted diffuser and back plate gently with a soft, dry cloth. Avoid using abrasive materials. Be aware that these lights are not suitable for harsh weather or heavy rainfall areas unless they are properly protected. If you're in such an environment, consider using IP65 fittings instead. The lights come with a 3 - year replacement warranty, so if you have any problems, you can get a replacement within this period.