Increasing the output of these types of lights is really more dependent on the power source than the bulb.
If the SLA battery is in top condition it may be able to support a 130W bulb and actually produce a few hundred more lumens for a few minutes. Sometimes the extra load just makes the battery sag more and the actual lumen gain isn't really perceivable. The beam also suffers from the "yellows" instead of being warm white. Anything from 100-120W should make a decent replacement but don't expect any large output gains. The only way to make that happen is to ditch the SLA and go with NiMH power or one of he many lithium chemistries....and if you're going to do that you might as take a look at some HID lights.
I just double checked for the record... the 130/100w H4 was out of the Thor Colossus I converted, you're correct the Pro's Fav' does indeed have a 120/60w H4 Halogen but swapping out the 120w for a 130w wouldn't make a great deal of difference IMHO :thumbsup: