Using these pendant lights is easy. First, have a licensed electrician install them following the instructions in the box. Once installed, you can screw in an E27 bulb (not included) that fits the 72W limit. These lights are designed for indoor use only, so don't use them outside. For maintenance, simply turn off the power and gently wipe the iron cage with a dry cloth. Avoid using abrasive cleaners as they can damage the finish. If you encounter any problems within a year, you're covered by the replacement warranty.