Absalulty I agree , it’s not just about percentage of light transmission. Ive learned that in the last year or, no thanks to albinos 😞. I have binoculars that have lower light transmission numbers and are clearly brighter in low light conditions than others with 2-3+% more.Regarding brightness it's what expected. They should not differ at daytime.
I could see the edges of the field even with 8x32, but the field was not evenly "illuminated". I needed to come 1-2mm closer for the perfect open view. I use to describe it like "climbing into the image".
2mm difference of eye relief seems correct. And for me these extra mm was probably what had been needed to get that perfect open view even with the 8x32.
As you say NL Pure is definitely on a higher level than Conquest.
I compared Conquest HD 8x42 and NL Pure 8x42 at night and NL Pure actually looked brighter. It should hardly be a detecteable difference with only 2% light transmission difference, but it still was. I think the reason can be the cooler image which for the eye can be perceived as brighter. Adding to that better sharpness and contrast, it resulted in more details could be seen in the darkness.
It was just on axis sharpness of the 8x32 which highly impressed me, rivalling the sharpness of NL Pure in my eyes.