I switched over to all led over last 2 years using marinebeam.com They have
a good rep and found Jeff very helpful.
These led's will withstand the flux in voltage we sailors deal with
and discharging our batteries
. Many led's do not and shorten their life
I used my existing fixtures with socket adapters and red/white switchable led bulbs
(g4 led bipin led bulbs) Put in red/white switchable led's in just about every other
fixture on boat
insuring night vision while under way or during night at anchor
. And very easy to operate, just switch toggle within 3 seconds
to switch from red to white.
Sure they sell entire fixtures as well. Think there is discussion here and/or on sailnet
on marinebeam, worth while checking into.