The electric bicycle forums are very interested in getting as much LED light as possible from as few Watts as possible when riding at night. 48-volts is a common battery value there. Here's just one discussion of many, use the search function at the top right for more if this type of discussion is valuable to your project.
http://endless-sphere.com/forums/viewtopic.php?f=2&t=2951&st=0&sk=t&sd=a&hilit=l ed%E2%80%A6[ Parent ]
