But the light given out by LEDs is so different (bluey/white) than a warmer halogen bulb. This surely is a matter of taste - not everybody likes white light and, let's face it, it hardly flatters wood finishes so is always going to look pretty nasty on a boat.
However, having said all that, 20 good quality LEDs could certainly match a 15W halogen bulb in terms of lumens, but as to whether you can get good quality LEDs cheap, and whether this would produce the quality of light you want - that's another matter. Cheap white LEDs are generally useless - no wonder they don't last.
One of the ideas I have had, but not tried it out yet, is to build a ring of about 20 white LEDs interspersed with amber or red LEDs to create an overall warmer effect.
Anyone seen anything like this as a commercial product - or shoudl I set up in business with a new idea! (you heard it from me first!!!)