Using this red neon cross light bulb is easy. First, make sure your lamp has an E27 screw base. Then, screw the bulb in gently, and you can choose to position it upward or inverted based on your lamp's design. When using it in the US where the voltage is 110V, keep in mind that the bulb will be dimmer than usual. This bulb is for decorative purposes only, so don't use it as a main light source. To keep it in good condition, handle it carefully as it's quite delicate. Avoid knocking it around. And when you're not using it, store it in its original red foil, black box packaging to protect it from dust and damage.