City Commission Meeting Room

Before

Center Up Lights

8-150W Halogen =      9.2A @ 119V

                                    1094.8W

South Wall Lights

8-100W Floods =        8A @ 120.3V

                        959.85W

Front Lights

8-200W Inc =              11.5A @ 118.5V

                                    1362.75W

General Lights

8-70W MH =              6.5A @ 118.1V

                                    767.65W

+                                  +

16-200W Inc =            25A @ 117.8V

                        2985.1W

Display Lights

7-100W Inc =              5.8A @ 119V

                                    690.2W

North Wall Lights

3-75W Inc +                4.0A @ 119.8V

1-300W Inc =              479.2W

Total Watts =                         8339.55W

Inc = Incandescent bulbs

MH = Metal Halide bulbs

CFL = Compact Fluorescent Flood bulbs

#A = # of Amperes (current flow)

#V = # of Volts

#W = # of Watts (power consumption)

V x A = W

Cost of Bulbs -                          $469.99

Cost of Socket Extenders -        $155.52 *

Total Materials -                        $625.51

* One time cost

After

8-150W Halogen =      9.2A @ 119V

1094.8W

                                    *No Change*

8-20W CFL =             2.2A @ 120.3V

264.66W

                                    -695.19W

8-20W CFL =             1.9A @ 118.5V

225.15W

                                    -1137.6W

8-70W MH =              6.5A @ 118.1V

767.65W

                                    *No Change*

+                                  +

16-20W CFL =           3.9A @ 117.8V

459.42W

                                    -2525.68W

7-20W CFL =             2.0A @ 119V

238W

                                    -452.2W

4-20W CFL =             1.0A @ 119.8V

119.8W

                                    -359.4W

Total Watts =             3169.48W

62% reduction in total energy consumption in room

80% reduction in energy consumption vs. original bulbs only

8339.55W – 3169.48W = 5.17kW saved

Electricity cost = $0.0305/kWh

5.17kW x $0.0305/kWh = $0.1577/h saved

$625.51 / $0.1577/h = 3966 hrs to payback

Bulb life rated @ 6000 hrs