http://www.ledlight.com/
The first thing I bought from them was some replacement LED bulbs for my courtesy lights. My fittings take #90 automotive bulbs. Which have BA15D bases. The bulbs I ordered were blue and had 9 LEDs. They just fit in the housings. Which by the way are cheap Seachoice transom 135 degree navigation lights.
They worked very well. So I added two more identical courtesy light fixtures, and ordered two more blue BA15D bulbs. And it was even better. And cheap too. The fixtures were all of $14 each - and two came with the boat. The bulbs were $8 each. So for the price of a single LED courtesy light I can get at least 4 bulbs.
I have since ordered 4 red and 4 green bulbs. So I can change them out as I see fit.
The RGB strips are $14.99 per foot if you buy them in one foot strips, $23.98 for a two foot strip, and $32.98 for a four foot strip. This is not too bad, considering that I got my single color strip lights for $6 for a one foot strip. The single color strips came from Scarb Chris at coastalnightlights.com
This is an old photo of the strips under the t-top, taken before the project was finished. The center support has three strips on it, the other supports have only one. It is kind of hard to explain the whole strips under the t-top thing.
So the total cost to retrofit my boat with blue LED courtesy lights (4 of them) AND accent lights under the t-top (9 one foot strips, connected three at a time) was $114. I checked, and the cost just to replace my original two courtesy lights with LED fixtures would be at least $80 - $100.
The RGB strips will cost a bit more than $54, but if I consider each RGB strip is like three single color strips, it works out.
The cost for the same thing I have now under the t-top but with RGB strips and a color changing controller (with wireless remote) is $205. As opposed to $162 for three sets of single color strips, plus the hassle of having to run three sets of wires and stuff. Oh and no color controller.
But I am considering another option.
LED color changing (supposed to have three million color possibilities) kit made for cars. They may be brighter than the strips, but they are not flat (they are tubes) and the problem here is that the flat strips are so much easier to mount to my t-top hardware.
http://www.ledunderbody.com/index.aspx
Anyhow just some ideas I am kicking around. I am happy with what I have now - but you know how it is. You ALWAYS want to go that one extra step.