RE: Replacing existing bulbs with LEDs
We use the Zenon interior lights that have proved as bright yer far cooler than halogen.
The LED are great , but as nav lights , esp if you go out beyond the COREGS line they may be illegal.
Intl. light standards are far tougher than USCG "standards".
I would be esp concerned with the anchor light for the non M>M boats that do anchor out..
10W in a really fine housing with glass fressnel is MINIMUM.
On holiday weekends we use a 25W in our Perko (rated for 85ft intl boat) to let the drunks have a better chance .
On our Motor Sailer we use the anchor light PLUS the spreader lights are on illuminating the deck till 1AM , (wind up timer), in any East Coast anchorage.