I just received my prototype Blue-Green (B-G) Arc AAA from the first auction and did a quick side by side comparing this new light with an Arc Snow and with the DS. Very, very subjective, but here it is: The beam size and beam pattern of the B-G and DS are nearly identical. The B-G has a smaller hot spot than the snow, but about the same size as the DS. It has as large a corona and as much spill as the DS, both of which are much larger than on the Snow. Somewhat surprising to me, the outer edge of the spill is very sharply defined, more so than on any other Arc I still have. In terms of total output the B-G is REALLY BRIGHT, seemingly about as bright (at least at close range) as the DS. When I compared them outside in the dark a few minutes ago I was very impressed at just how bright this sucker is - much brighter than I had expected. I was warned that the LED on this prototype was off-center, and it is. The B-G also has rings more pronounced than I've seen on any other Arc. At first glance I don't like them but have not yet used this light enough to form any opinion about their effect on overall performance. It also has some sort of artifact or defect in the corona but looking very closely I think this may just be incident to the off-centered LED. But these negative comments should be put into perspective. THESE ARE EARLY PROTOTYPES AND NOT PRODUCTION LIGHTS. I've never used any colored LED enough to form an opinion about the usefulness of this particular color. Incidentally, when I picked this light up from Arc today, I had a very brief opportunity to compare this new B-G with a prototype Green. The tint of my B-G has a good deal more blue than the photo above, and it is really, really brilliant and beautiful. The Green was also bright and seemed to be of a somewhat deeper tint than appears in the photo. In short, there is a very considerable difference between the two tints, the contrast appearing to me to be greater than the photo shows. These tints ought to please anyone who likes colored LED's. The battery tube and head, of course, are pure Arc. Perfect. To sum it all up, I like this new Arc a lot, as will anyone who has ever dreamed of a brightly colored light built the way Arc builds lights.