Many people have been using this IO driver, and getting very high lumens from it:
http://intl-outdoor.com/boost-7led-3-modes-23-cells-input-circuit-board-p-545.html
EDIT: Here is the thread:
Many people have been using this IO driver, and getting very high lumens from it:
http://intl-outdoor.com/boost-7led-3-modes-23-cells-input-circuit-board-p-545.html
EDIT: Here is the thread: