Replacement bulbs > Halogen capsules > G9 bulbs
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.