Sign Ballasts | Smart Wire | Parallel Wire | Keystone To make upgrading to an electronic ballast as easy as possible, Keystone offers two solutions: Smart Wire and Parallel Wire. Benefits of Smart Wire. Wires exactly the same as traditional magnetic sign ballasts for seamless compatibility and installation; Weighs up to 50% less than magnetic ballasts, making transportation easier Series Ballast Wiring 4 Lamps - Electrical 101 With a two lamp series ballast, if one lamp fails the other lamp connected to that ballast will not light. 4 lamp fixtures containing series ballasts will usually use two 2 lamp series ballasts (see diagram below). 4 lamp fixtures containing HO (high output) lamps use one 4 lamp HO ballast (diagram not shown).
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