I installed an LED tricolor and anchor light, which I believe is certified and that's what I use under sail and when at anchor, but I left the deck-level running lights as is with the regular bulbs because the only time I use them is when under power and then I have plenty of extra juice so it doesn't really matter. The LED anchor lights are plenty bright, but the color and look is very similar to a star and may not always show up all that well to someone speeding across the harbor on a dinghy or a launch. I have a couple of small solar lights near deck level that illuminate the deck and help with that problem.