G4 and G9 lightbulbs are popular choices for small-scale lighting applications. G4 bulbs utilize a 2-pin bi-pin base, while G9 bulbs feature a 2-pin looped base. Both types are compact and easy to install, making them suitable for under-cabinet lighting, chandeliers, or decorative fixtures. With various wattages and colour temperatures available, G4 and G9 bulbs offer efficient and focused lighting solutions for spaces where a smaller form factor is required.