=====  Goals  =====

  -  Easy to remove
  -  Easy to charge
  -  Bright as hell, illuminates the road without blinding oncoming traffic.

=====  Commercial options  =====

Is there anything reasonable here?  Most of the 3-4 lamp Cree lights seem to cost $300+.

=====  DIY  =====

[[http://www.instructables.com/id/A-portable-luxeon-bike-light/|Cree XR-E + 8AA batteries]]

=====  LEDs  =====

Cree XP-G [[http://parts.digikey.com/1/parts/1780471-led-xlamp-cool-white-smd-xpgwht-l1-0000-00g51.html|XPGWHT-L1-0000-00G51]] ([[http://www.cree.com/products/pdf/XLampXP-G.pdf|data sheet]])