Purchasing Advisor: MH Track Lights Calculator

MH Track Lighting Savings Calculator
Electricity cost ($/kWh)
Lamp useage h/y
Lamp-specific input	Halogen	Energy-efficient alternative (MH or CFL)
Lamp cost ($)
Fixture cost ($)
Lamp life (h)
Lamp power (W)
Ballast power (W)	NA

Annual lighting energy cost ($)
Annual cooling energy cost ($)^a
Annual lamp-replacement cost ($)^b
Annual lamp-replacement labor cost ($)
Total annual operating cost ($)
Annual savings ($)	NA
Purchase cost of lamp + ballast ($)
Incremental purchase cost ($)	NA
Simple payback period (y)	NA
Total cost of ownership over 10 years ($)
Cost savings over 10 y	NA
Notes: CFL = compact fluorescent lamp; COP = coefficient of performance; h = hour; kWh = kilowatt-hour; MH = metal halide; NA = not applicable; W = watt; y = year. a. Cooling energy costs assume 80 percent of input power becomes a cooling load for the halogen system, 30 percent becomes a cooling load for the MH system, and cooling load COP is 3.4. b. Lamp replacement cost assumes 15 minutes per lamp at $25/h.