Thanks Rual. That lamp looks like the business, at last. I might even be tempted to give up my first series Cyo for the either this edition of the IQ X or the third version of it. (BUMM sometimes lucks out with the first edition of a lamp, as they did with the Cyo. They have a pretty grim history of launching retrograde second editions, and then making a step advance in the third or fourth edition, vide the Cyo again.)
I like the French ultramarine on-indication (the blue ring), the ability to use a reflector (presumably supplied in the price) without cutting down the lumens, the sideways light slits (if they're big enough to be seen by motorists at T-junctions), the tall, adjustable mounting arm (I hope it is glass-filled, because the hitherto best tall mount by BUMM appears to depend for its rocksolid performance on being glass-filled nylon), the fact that there is light directly in front of the bike and to the sides without having to take a cut in output. In fact, this lamp appears to answer most of my criticisms of BUMM lamps in the past.
However, the light output, while plentiful, seems to have some holes in it, which could be disturbing to those of you who ride many hours through the night, especially when you're tired and could mistake a glimpsed shadow for an obstruction and swerve, perhaps into danger. I'm almost never on the bike for more than an hour at a time at night...
I'd like to see consumer-shot beam photos before I splash out, but this lamp, or one of its immediate successors, could bring me back into the BUMM family.