Lighting Appliance Typical Usage $/month $/year   Christmas Lights Snap-in Base (100 lights) 6 hrs/day 0.35 n/a Large Screw Base (50 lights) 6 hrs/day 3.20 n/a   4' Fluorescent Tube 4-Lamp, T-12,  2 Magnetic Ballasts 10 hrs/day 2.90 34.80 Option: 4-Lamp,T-8  1 Electronic Ballast 10 hrs/day 0.20 2.40   Exterior Flood Light Incandescent 150 watt 10 hrs/day 2.30 27.60 Option: High Pressure Sodium - 35 watt 10 hrs/day 0.65 7.80   Interior Light Bulb Incandescent 60 watt 10 hrs/day 0.90 10.80 Option: 15 watt Compact Fluorescent 10 hrs/day 0.25 3.00   Interior Light Bulb Incandescent 75 watt 10 hrs/day 1.15 13.80 Option: 18 watt Compact Fluorescent 10 hrs/day 0.25 3.00   Interior Light Bulb Incandescent 100 watt 10 hrs/day 1.50 18.00 Option: 27 watt Compact Fluorescent 10 hrs/day 0.40 4.80   Exterior Area Lighting (equivalent lighting levels Mercury Vapor  175 watt 10 hrs/day 3.00 36.00 High-Pressure Sodium  100 watt 10 hrs/day 1.75 21.00 Metal Halide 100 watt 10 hrs/day 2.15 25.80   Exterior Area Lighting (equivalent lighting levels) Mercury Vapor  250 watt 10 hrs/day 4.35 52.20 High-Pressure Sodium  150 watt 10 hrs/day 2.60 31.20 Metal Halide 175 watt 10 hrs/day 3.20 38.40   *All Estimated Energy Costs Calculated At $0.05/kWh   EFFICIENCY TIPS Consider using photo cells, or better yet, motion sensors, on exterior lights.  Use minimum wattage light bulbs where possible. Turn lights off when not in use, including fluorescents. Lighter shades of paint are more reflective indoors. Use timers for security lights during vacations. Occupancy sensors are available for indoor lighting. Use a timer on your Christmas lights.     CUSTOMER PROGRAMS Screw-in compact fluorescent light bulbs are available for reduced prices at Salem Electric. Efficient security lights are available for rent through Salem Electric.          | Useful Information | Home Energy Use Guide |