for internal LEDs on the boat we started with just changing the bulbs, but then swapped to the whole fittings. Bought them from a USA RV place, cant remember which one and had a friend post them to us from the USA. Way cheaper and so far (18months) good quality.
Its well worth changing the whole fittings. For two primary reasons - the light is better - the diffuser (lens) in the light is designed for the particular LEDs inside it. the second reason is that the weak point of any lights is often the bulb socket - changing to a good LED and wiring directly removes these connections entirely. A good LED fitting should give you about 50,000 hours MTBF (Mean time Between Failures)
I use a lot of LED strip lights as well though, however I quite like the Bell Rock cabin lights - like this https://www.whitwort...tAbsolutePage=3
White - and the brightest LED cabin lights I've seen - and red for night. Really good lights - I'd like to sell them, but the manufacturers only seem interested in a pallet at a time... I have 3 of these, all going fine after 5 years.
There is nothing, absolutely nothing, half so much worth doing, as simply messing about in boats