All of the lights...
“Replace your home's five most frequently used light fixtures or the bulbs in them with models that have earned the ENERGY STAR and save $70 each year in energy costs.
The bathroom vanity is one of the highest-use fixtures in the average home. ENERGY STAR Certified CFLs provide bright, warm light, use less energy, and generate less heat than standard lighting. Keep in mind that high humidity can shorten the life of CFLs. To avoid moisture problems, control humidity in your bathroom by running your ventilating fan during and 15 minutes after showers and baths. You can find ENERGY STAR Certified fixtures in hundreds of popular styles, including vanity lighting, at home improvement and hardware stores, lighting showrooms, and other retail stores including online “outlets.