Thought this might be useful – these are guidelines for laser settings recommended by the laser manufacturers of some of the more commonly used ones. This may be useful as a reference for those wondering if the settings are high enough.
Gentlelase: http://www.laserpartnersok.com/uploads/GLP_Treatment_Guidelines.pdf
GentleYAG:
Apogee Elite (page 4):
http://www.cynosure.com/products/elite/pdf/Aesthetic-Trends-Article-Apogee-Elite.pdf
Lightsheer Diode (page 7):
http://www.aesthetic.lumenis.com/pdf/highpower_lhr_system.pdf