Go to flashlightreviews.com to see what the new KL3 beam looks like. I have one on my 9p, and like it so much that I recently put it on my G2 for comparison. Light output is the same with only runtime being increased by 2 or 3 hours. The KL3 head does make the G2 noticeably bigger due to the size of the KL3 head vs. the original G2 head. If you want to keep stock size of the G2, you might check out Bug Out Gear's 3 watt LED drop in at lighthound.com or bugoutgearusa.com. It only costs about half as much as the KL3, although I don't know how performance would compare b/n the two different brands. Maybe someone can chime in on that issue. Performance of the KL3 is awesome. It rates 19 lumens on Surefire's website, but it's concentrated into a throw pattern and is very bright for the amount of energy being expended.