Given a server room of 8 servers and 2 upses and 2 fluorescent light fixture... the 208volt efficiencies do exceed the savings of turning the lights out.
59watts x 40hrs a week x 52 weeks @ $0.12 kwh x 2 fixtures = ~$30
Low end estimate of APC's current loss savings ($4 per server per year) x 8 units = ~$32
Big whoop.... thanks RW
But... at $100 more per ups, it still doesnt pay to go to 208volt.