This is the one we use
. It has always been the brightest in any anchorage that we have been in. And, it has a sensor so it turns off at dawn and on at dusk. And, at $35.50 plus shipping, it was easy on the pocket book!
I have no affiliation with the company but am a very satisfied customer.
We installed two spreader lights
May of 2011 and we think they are terrific. Again - very low battery draw.
I have pictures of them on our boat if anyone needs them.