No, but I have a similar 3W Luxeon MR16 from autolumination.com ($20), and commuted with it as my low beam most of last winter. Actually draws more like 4W, so almost certainly less efficient than one of the arrays of smaller LEDs. But even then, output is better than a 5W halogen, plenty of light for my low beam use. The claimed beam width is 100 degrees, but in practice it puts most of its light into about a 15 degree center area with much dimmer overspray amounting to about 100 degrees. In other words, quite well suited to bicycle use. I saw the superbrightleds.com version as well, but at least at that time it was twice the price.