Provide a simple payback period analysis of lighting controls in a 10,000-ft2 office area comprised of 7,200 ft2 of open landscaped office space and 20 enclosed perimeter offices (2,800 ft2). The total lighting load used for the space is 17 kW, and the office is operated 260 days per year. The open space is monitored by 24 ceiling-mounted motion sensors. The perimeter offices are monitored with wall-mounted sensors (one for each office). The installed cost of a ceiling sensor is $110 with a $64 utility rebate. The wall sensor costs $75 with a $32 utility rebate.

Determine the simple payback periods with and without rebate. Assume the additional off-time (hours/day) is 1, 2, 4, 6, and 8. Two scenarios for electricity cost are $0.07/kWh and $0.14/kWh. Show your results in a tabular format.