It seems about what you'd expect going from the NZ7 to the NZ9 based on the specs (pro-rata'd).Insane jump. NZ8 and NZ7 seem close, NZ9 has ran away with it in those measurements. Is that just high bright setting? After calibration do they get closer?
If anything the odd one out appears to be the NZ8, which doesn't seem as bright as you'd expect compared to the NZ7. Or maybe the NZ7 is punching above.