A multifunctional output driver capable of transmitting signals of different interfaces in different modes is provided, in which first and second current sources are provided, and first to fourth switching devices are coupled between the first and second current sources, and the first and second current source and the first to the fourth switching devices act as a current steering circuit. One method comprises reducing the concentration of oxygen in the reactor feed gas to reduce the value of the alkylene oxide production parameter. Each standard timing element is associated with one or more standard timing checks. The coated bearing surfaces are finally finish-machined to the finished size without the need of machining the bearing surfaces of the casting blank after the heat treatment. By adapting the properties, dimensions andor orientation of the faces of the wavelength converting member according to the invention, a desirable light distribution from the light-emitting arrangement is achieved.