It may not have a Cibie/projector grade cutoff, but from the photos I've seen, it's reasonably good - certainly far better (if aimed carefully) than a full round beam.

I thought that the Ravemen stuff could be toggled between low and high beam via the remote button, but apparently not. That's a little disappointing.

Thanks for the links. I'll take a look. I am still sorting out the options for a rechargeable light (I have no dynamo). Unfortunately there are so many counterfeit products and so much shameless junk available that it can be hard to know what you are actually getting.