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I'm pretty such as as u google, u should find what u want. Just a rought outline, G9 can have as much as 15% increase from a G2.
I read that somewhere in the forum, regarding G9 lens. Not sure where though.What?! Where did you get that from? There's almost no difference.
Alan
As tttonyyy mentioned above (thanks Tony!), I did an extensive study a while back comparing the G9, G2, 3-element, and acrylic lenses, see here:
http://laserpointerforums.com/f52/updated-g9-vs-g2-vs-3-element-vs-acrylic-study-85334.html
G9 pretty consistently beats the G2 by 10-15%, in terms of raw power.
-Andy