LED bulbs are becoming more commonplace as the energy-efficient bulb of choice, since they use a fraction of the energy of CFL bulbs and are long-lasting. But LED bulbs can also be problem solvers for older homes. If you have a bathroom that does not have great ventilation, over time the steamy showers can lead to a damp room that grows mold and mildew. By using an LED bulb embedded with an ultraviolet light, you can help inhibit growth of mold and mildew with the simple flick of a light switch. The same bulbs are often used to keep hospitals healthy.