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The G4 halogen is one of the most common lamps used in caravans and motorhomes and is easily identified as a small glass lamp with two short pins spaced 4mm apart. The G4 halogen is commonly used in ceiling lights, wall lights, downlights and reading lights and is easily replaced with an LED alternative. This disc type LED G4 is used to provide light in one direction and are best used in downlighters, ceiling lights and spotlights. TAll of our G4 LED lamps are voltage regulated and are not polarity sensitive - i.e. the LED will light up whichever way the positive and negative power is applied so no rewiring is required.