These days there are a lot of scopes that are very close in low light conditions, and the gap between the bigger names and many other brands has well and truly closed.
My eyes tell me that my 6x42 Meopta is better than my S&B, but they also tell me that my Nikon Monarch is as well, and the Prostaff's aren't too far behind, in low light terms at least.
We are all different - a mate of mine swears that he can't see any benefit when peering through my scopes compared to his cheapie Hawke. That could be for other reasons or he might have squiffy eyesight.
I've not found a zoom scope that was as good as a fixed same size objective lens from the same manufacturer in low light.
Redfield are pretty decent overall IMHO.
For the record, I tested some of my scopes as the light failed recently and found a £250 Bushnell Legend Ultra HD left my Leupold VX2 and VX3 for dust in low light.
Leupold might have its brand name in its favour but, in pure low light performance, the much cheaper Bushnell Legend punched way above its weight. Loads of people wouldn't even look at one though, just because of the brand or country of origin.
Meh...
I think a lot of people overlook some serious performance bargains in favour of big brands on the assumption that they will always be better performers. Leupold in particular (just in my opinion of course) appears to be relying on a name made decades ago rather than producing scopes that drop any jaws, at east until you start spending thousands rather than hundreds.
Your mileage may vary - I hope you find a resolution.