18. Find the SPP and IRR for the following scenario and make a recommendation on which upgrade would propose: You are preforming an energy audit and are looking to upgrade the lighting. Currently there are 120 four-lamp F40T12 troffers that contain 34-watt lamps and two ballasts. Assume the company is using current NB Power General Service 1 (Standard) rates. The demand is well in excess of 20 kW and the consumption is well over 5000 kWhs for the month. The current luminaires consume 156.4 W/fixture (lights and ballasts). You have 2 options to consider. Option one is replacing the existing internals with 3-F40T10 lamps at $20 per fixture. This set up would consume 138 W/fixture including ballasts. Option two is replacing the existing internals with 3-F32T8 lamps and install electronic ballasts at $45 per fixture. This set up would consume 91.2 W/fixture including ballasts. Assume the lights are on 24/7 and that both options have a 7-year lifetime before needing replacement. (Consider both demand and consumption savings) 18. Find the SPP and IRR for the following scenario and make a recommendation on which upgrade would propose: You are preforming an energy audit and are looking to upgrade the lighting. Currently there are 120 four-lamp F40T12 troffers that contain 34-watt lamps and two ballasts. Assume the company is using current NB Power General Service 1 (Standard) rates. The demand is well in excess of 20 kW and the consumption is well over 5000 kWhs for the month. The current luminaires consume 156.4 W/fixture (lights and ballasts). You have 2 options to consider. Option one is replacing the existing internals with 3-F40T10 lamps at $20 per fixture. This set up would consume 138 W/fixture including ballasts. Option two is replacing the existing internals with 3-F32T8 lamps and install electronic ballasts at $45 per fixture. This set up would consume 91.2 W/fixture including ballasts. Assume the lights are on 24/7 and that both options have a 7-year lifetime before needing replacement. (Consider both demand and consumption savings)