MarineBeam are the best, but do cost more. But you'll know they work. There is some controversy over changing exsisting nav lights to LED. The fixtures are only USCG approved with the original bulbs whatever type that was. USCG only cares about that for what the boatbuilder installs, not what an owner changes to as long as the colors remain correct. Using "warm white" led's in the colored lights will give correct colors. "Cool white" makes them a little too blue. Should one have a collision after dark with converted lights the other guys lawyer might make an issue of it.