G9 bulbs run at mains voltage (230v). These G9 bulbs have two connectors at the base of the bulb. These connectors are often either two wire loops, some manufacturers use a solid, flat, spade type connector instead.

Most G9 bulb manufacturers embed the electrical connectors directly into the glass base of the bulb, but some add a ceramic base too.

G9 bulbs are most often used in household decorative lighting, where they are most often found inside a glass light shade. Their small size and high light output means that they can be used in main room lights.