With all the variable voltage mods now, here's a guide on suggested voltage power to use on various ohms, courtesy to some vaper who posted this earlier
http://img.photobucket.com/albums/v202/trinitrophenol/unled66-1.jpg
Click on the link for a larger size pic

http://img.photobucket.com/albums/v202/trinitrophenol/unled66-1.jpg
Click on the link for a larger size pic