A space efficient arrangement of at least one LED with a rectifying element and a current limiting element forms a compact module that can be powered using an AC voltage source. One method for monitoring electronically delivering documents is provided which includes the steps of: creating log files for storing selected data related to selected electronic document preparation events; forwarding the log files to a central database for storage; and providing access to the log files for retrieval and analysis. A cobalt silicide layer is formed at the bottom of the contact hole while forming a titanium layer on the cobalt layer. The liquid product stream, which has a substantially lower sulfur and nitrogen content than the original feedstream is passed to a second hydrodesulfurizing stage also containing one or more reaction zones where it is reacted in the presence of hydrogen and a second hydrodesulfurizing catalyst at hydrodesulfurizing conditions.