I've been hunting coyotes at night - not just dusk - for many years (over 25), without illumination. I've done this successfully with 3-9x40mm scopes, but REALLY enjoy the Bushnell Elite 6500 2.5-16x50mm for this. It's all about your magnification setting.
Exit pupil is the trick. Your eye will be about as dilated as it can be as the sun goes down, so you need to be sure your exit pupil is as large or larger than your physical pupil. So you need your exit pupil to ride around 6-8+ millimeters. The easy way to do that is run low magnification. A 3-9x40 at 3x will have a ~13mm exit pupil, plenty of light for NIGHT hunting, more than your eye could take in. Crank up to 9x and you drop to 4.4mm, which would appear quite dark, no matter what brand was on the box.
Great glass with great transmissivity is great, but it's not the end all of all scopes for dawn and dusk hunting. I'm an optic snob, typically, but I still own a lot of lower end scopes, suited for the tasks I ask of them. Hell, I use my Simmons ProHunter handgun scope at dusk, 2-6x32mm, as my eyes, because I can see better through it than my naked eye - a $125 optic. High end optics will be brighter and more resolved, but a guy can buy a lot of brightness simply by lowering the magnification.
Glass with high resolution and RELATIVELY good coatings will produce a well contrasted, crisp image, better than cheap junk, but a guy can buy this for $500 easily. It doesn't, however, in my experience, typically say Leupold on the box at that price point, which surprises a lot of folks. I've kicked butt with Bushnell in the dark - not the trophy's or banners, but anything from the Elite line has done well for me. Nikons have not done well for me either. VX3 and up Leupolds have done well enough for me at night, but to be honest, Bushnell does better. I've been very happy with Nightforce BR, NXS, and SHV F1 in the dark and have never had a Zeiss Conquest which didn't do well at night as well, but none of these are cheap. Vortex and Leupold are serviceable, as is Nikon, but for the money, better scopes are out there.
If a guy is wanting to shoot 200yrds at dusk, wanting to be cranked up at 12x, it really just isn't going to go well. To have an 8mm exit pupil at 12 the objective has to be 96mm... but if a guy runs a 50mm at 6x or less from a $500+ scope, the picture will be plenty bright.