Thanks for the pics; that does looks promising. Unfortunately, as previously stated their website does not list the lumens rating. However, for comparison, their auxiliary lighting product is rated at 2000 lumens; and, it only uses a fraction (1.4a) of the amps that the headlamps (2.5a/4.5a) are rated for. According to Sylvania's website, the Silverstar lamps range anywhere from 700-1700 lumens depending on the application.
http://www.ledheadlamps.com/81802.html
I'll be watching closely for a release of the 4651 & 4656 sizes.