Osram produces halogen bulbs in many different kinds. The Osram Halolux halogen bulbs are tubular bulbs with an E14 or B15d base. Because these Osram halogen bulbs work with 220-240 Volt, they do not need a transformer in order to be connected to the power network. Within the Osram Halolux serie there are two variations. the Osram Halolux T Eco and the Osram Halolux Ceram Eco. Both halogen light bulbs possess a UV filter what protects the objects they illuminate against discoloration and heat. The Osram Halolux bulbs are dimmable and free of mercury.