Pay attention to the latest technology, CCFL (cold-cathode-flourescent). This offers the best input power to light output efficiency of all, around 60 Lumens per Watt. In addition, the light output is dimmable.
The ones which we, as boaters, will find desirable will have built-in inverters, because they operate around 1350 Volts with almost no current
. They can be produced to give daylight-type color intensity for the best reading and illumination.
White LEDs which can provide the proper color temperature for reading and inspection
are expensive. Those which give sufficient light are often overdriven and not so efficient as other colored LEDs and, as a result, do NOT last the usual 100,000 hours as often claimed.
Don't get me wrong, I love the white LEDs and use LED flashlights aboard exclusive of incandescent ones now. I still use halogen bulbs for interior
lighting and reading and have had great life from them yet am looking foreward to the CCFL bulbs replacing them for extremely low battery
drain in comparison.
Check out this link: