The underwater LED lights used in boat lighting can be operated for up to 40,000 hours. This would give you 4.5 years continuous light output. Even though they're more expensive than incandescent lights, you don't need to change them as often as with LED boat lights. These lights need to be maintained and cared for as they are often submerged in water. You should clean your underwater boat lights at least once a month to get rid of algae, barnacles and other sludge.