Certainly you have all the senses. Hopefully I can release some initial testing photos of XtendIR-B next week, not sure yet.
Both XtendIR-I and B are specifically designed to increase the flash range/degree of hunting cams in the matter of both efficient illumination and power saving. For the black flash version (B), besides the enhancement of illumination of black flash cameras, the second purpose is to convert the red-glow IR cameras into black flash by covering up the red-glow leds of the cameras.
You are right, cameras are different on parameter setting, infrared sensitivity, light-metering and etc. Each camera has their own preferences and tricks (Sorry, it's unfair to disclose them here). However, it does not necessarily mean a cheap camera will be worse on the conversion, by some big chances, it could be even better because it may skip the sophisticated light-metering procedures (the technology is more advanced but may not be more desired in this purpose) and just takes whatever it got there, the conversion MAY even better since for black flash, the most important is the illumination degree, the whiteout issue is not as severe as IR cameras as long as the object is 10 feet or so away (closer than that, all cameras, no matter cheap or expensive, will have a problem due to the strong reflection as we know)..... You see my point?
Anyway, for this discussion, it can be very long.......................
For XtendIR-B, the basic enhancement bank needs more LEDs than -I for sure, that's the nature it is, it will consume MAYBE xx% (not xxx%) more power than the basic bank of -I, the flash range is going to be similar to certain popular black flash camera. When bank2 and bank3 are all on with bank1, the flash range is going to be YY feet, the overall power consumption wont' be worse than -I.