G9 LED replacement bulbs are available in cool white and warm white colors. They typically work for universal voltage from 85 volt to 265 volt. Dimmable G9 LED bulbs work separately with 110-120 volt or 220-240 volt systems. Retrofit LED G9 bulbs are widely used to replace halogen capsule G9 lamps; they are applied for household, decoration, hotels and landscape lighting. 12 volt G9 LED bulbs are also available for limited applications where there is an existing 12v transformer. We recommend iron-core, magnetic and wire-would transformers for 12V AC led bulbs.