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- How to build a simple Luxeon LED bike headlight

You definitely didn't get
You definitely didn't get the correct optics, I have a feeling based on the timeframe you got them in that those are Luxeon optics, not Cree (and as such, would be unpredictably bad compared to Cree lens spec sheets).... here is my "Cree optics comparison" website...
http://christexan.com/biking/bikelights/LensComparisons/
or if the registration (updated just before this post) hasn't propogated yet (subject to change anytime after the day of this posting)...
http://76.183.249.123/biking/bikelights/LensComparisons/
It is clear that a Cree with a 6* Polymer Optic is a very tight beam, nothing close to what you describe. And I've used them "loose" and bumped them around, they lose a little focus, but mostly it's just the hotspot moves within a very slight halo if it's even close to seated properly, so those are the wrong lenses. Glad they work for you though!