Mercury vapor lamps are a type of high intensity discharge (HID) lamp that is less efficient than the now widely used metal halide and high pressure sodium lamps.  However, these mercury vapor lamps continue to be used, both in existing fixtures and in some applications where the lower cost of mercury vapor lamps and ballasts are attractive ...

  Several leading organizations, including Jergens and Grainger, have introduced new and expanded versions of essential product catalogs.   Jergens, Inc., a manufacturer of standard tooling components, has just published the latest edition of its Specialty Fasteners Catalog.  The volume is a sourcing guide for Jergens’ ...