Nowadays, you have options like fluorescent lamps and L.E.D. bulbs.
Fluorescent lighting uses around 2/3 less watts than standard incandescent bulbs. Wattage will vary depending on the bulb in use. Lighting carries a big part of your electric bill amount. What if you replaced 60 watt bulbs with 13 watt fluorescent bulbs? In addition, color tone output has also become available with fluorescent lights. In general, cool white, bright white, and daylight are a few color tone options. If you look at it another way, your bill could be 60% less if the only thing running on electricity was lights. But of course, it does not exist that way.
Moreover, L.E.D. lamps save even more energy than fluorescent lighting. Unfortunately, there aren’t as many options yet with L.E.D. technology.