A low pressure mercury vapor discharge lamp includes an arc tube in which one discharge path is formed by connecting a plurality of U-shaped glass tubes that are provided with a fluorescent layer at the internal surface. In one embodiment, each master within the data processing system includes a corresponding privilege level modifier and corresponding trust attributes for particular bus access types. An aperture is provided in at least one of the first ferrule portion and the second ferrule portion, exposing the cavity, wherein the sealant is feed through the aperture. An antenna is used to generate an azimuthally symmetric electric field.