Watts only tell you the amount of power it takes to make the bulb work. They give less light than standard incandescent bulbs of the same wattage. Urge everyone to turn off lights when leaving a room. Having wall switches in convenient places helps everyone remember. Select lighting fixtures on the basis of their efficiency.
Fluorescent lamps produce about four times as much light per watt as incandescent bulbs.
Install fixtures on two or three separate circuits in large rooms where you may need high levels of lighting periodically but not all the time. Use three-way switches or dimmer control switches to keep lighting levels low whenever possible. Install photo-electric controls and timers to turn off outdoor lights during the day. Clean lighting fixtures regularly. Dust on lamps, reflectors and light bulbs impairs lighting efficiency.