Reuters: Texas will have a favorite state bulb — a light bulb — along with a state flower and a state song if mayors of five large Texas cities have their way. To kick off a statewide campaign to get residents to replace old light bulbs with energy-saving compact fluorescent bulbs, Texas mayors vowed to launch an effort to make the bulbs available, to encourage their use and to suggest that people give them as gifts for Christmas or other occasions. "Individual Texans can save …