I believe juist changing an incandescent bulb for a led bulb in a tricolour masthead light is not a good idea for the following reasons:
1. The incandescent bulb has a special vertical filament that ensures that the color overlap between the three sections is minimal < 3 deg.
Led bulbs have a whole array of LEDs so the color overlap will be much higher and can be as large as 30 deg. Very confusing for the other vessel observing you.
2. The colors of certified lights are very strictly defined for optimum visibility at night. Led colors have a different spectrum often more bluefish This will result in very strange color effects, the green will become blueish, the red will become orange, and the brilliance of the the colors will be affected significantly
3. From measurements we know that all led replacement bulbs give significant radio noise
in the VHF
bands. Since the light is close to your antenna
, this will result in very poor VHF communications
4. The led bulb s are much heavier and will not be stable in the fitting, resulting in corrosion
and bad contacts
5. In an enclosure the led bulb will become hot and loose its brilliance and have reduced lifetime
6. If in a certified light like Aquasignal 40 you replace the bulb by a led bulb, the certification
becomes invalid. Insurance
issues may result.
There are good alternatives like the Orca Green, Aquasignal 34 led, Hella Navilight trio, lopolight and K2W. All fully certified (though expensive).
Aquasignal 34 is lowest cost around 150$