Of course I can't say with any certainty, but for it's worth, it's widely suspected that the Dreambee actually has the same performance specs as the RS1/HD1, and is simply a bit more liberal with the quoted specs...for instance, the 20000/1 C/R is also specified as the actual performance ability of the RS1 before actually being delivered via the optical path, which renders it to a real-world 15000/1 C/R.
I suspect the same could be said of the lumen output, as if the unit has the ame UHP lamp, which it does to the best of my knowledge, there simply will not be any more lumens than on the RS1...
The option of different colors may be desirable to some I suppose.
Disclaimer: Totally biased RS1 fanclown...cannot be relied upon for any type of objectivity regarding same. You have been warned.