Osram Halogen Eco Pro Classic lamps are replacers for incandescent bulbs. The Eco Pro has a lower energy consumption but has the same fitting as most incandescent bulbs: either the E27 big screw fitting or the E14 small Edison screw fitting (SES). The Osram Halogen Eco pro works on 230V and doesn't need a transformer. The built-in UV block prevents discoloring by the emitted light. When replacing your light source, check out the light color and wattage usage to keep the same light effect.