It really doesn't work that way. It, any scope, works when there is enough light to allow it to work as it is adjusted.
I've seen nights where a scope or binocular with a 4mm exit pupil will work. And I've seen legal twilight where an optic, either a rifle scope or a binocular, would just barely work with a 5mm exit pupil.
That means the scope in question will work even when it has to have a 5mm exit pupil, but the user can't use 8X. He has to use 6X. Any more magnification and the scope simply goes black. You'll see nothing.
The other problem is the retilce. If it's a fine, tactical sort, they are often unusable even if the image is still present. E
Unless the recticle is laser etched and can be lite such as most NF scopes.
