Here are some pics of my color changing nitelighter install. Due to the small gap between the rail and the side of the pool I had to improvise by drilling into the post endcap and bolting the light directly to the rail.
And here are some night shots:
That thing floating on the left is one of those underwater light show floating thingeys. Not very impressed with the light output.
The red light leaves much to be desired, but you can see the underwater light show now.