G4 bulbs are compact capsule-shaped lamps whose pins are 4mm apart. These bulbs work on 12V so can’t be connected directly to the mains. Therefore you will need a transformer. Replacing your old halogen bulbs with LED G4 lighting is easy with the bi-pin socket. Due to its compact dimensions, the G4 bulbs easily fit into the smallest luminaires. By switching to LED, you save on energy costs, but retain the desired light quality. In addition, you do not have to replace the lamps for years, as they last up to 20 times longer. Always take a look at the size of the LED bulb, since it may differ slightly from the halogen variant.