With these lamps you can turn normal cockpit or ceiling lights into lights that can be switched to red light. Provided the base fits, this is the best and cheapest solution I know of.
In the last few years I have switched to the colors red and white in all lights where possible so that I regularly sail longer distances and at night a red light color is more pleasant.
The light color of the white light is not as warm as the LEDs that I had before, but it is okay. The advantage is the possibility of switching, which works without problems.
I have a jeanneau 39 SO, I wanted to replace the lamp in the saloon with this bulb, there is no electronics on the back. it is not possible to place the bulb in the frame