If you still incandescent bulbs, you should try changing your lights. It is always preferable to choose CFL or LED bulbs because the incandescent bulbs discharge 98 percent of the energy that they consume to heat.
Energy prices in Texas ordinarily are quoted between 5.69 to 14.94 cents per kilowatt hour subject to market conditions and your location, these rates will not be guaranteed and are only used as an illustration.
Lighting is usually ignored as there are people who're saying that you can turn your lights on for 24 hours without having to worry about electricity. Though bulbs are small, they actually consume a lot of energy.