I've previously done some low light testing and found it works reasonably well for the above use case, the illumination certainly helps against a dark background but the big objective lense and clear glass meant the reticle was fairly well visible well past reasonable hunting conditions.
It's just gone too dark at home to do a test tonight but I can try have another look tomorrow (if I remember).
@hectorso27
Well turns out I didn't remember....
I did have a look tonigh as light faded.
As far as reticles of this style (thin FFP, designed for long range) go I think the LRD-1T does a pretty good job in low light for hunting purposes.
The thick stadia on the sides of the reticle start from 7 Mils on each side where most other scopes start ar 10 Mils and they are thicker than many other reticles which definitely helps on low magnification.
Under full daylight or lower light but against a lighter background you can see the main cross just fine, the image is super bright and clear so the thin reticle pops out very well.
Against a dark background in low light the main cross is hard to see, you could shoot a fox or deer at close range due to the thicker portions of the reticle but out to 100+ meters you need illumination. The center only illumination is actually excellent for this purpose, it adjusts to a very low setting and doesn't wash out the target at all.
As far as scopes of this style go (thin FFP reticle) I think the Delta is actually excellent, I can happily use the reticle in most light conditions for either small game hunting or larger game, and in lower light the illumination is pretty much optimised for hunting.
The glass is rather excellent and the scope pulls in a lot of light, you could easily shoot an animal that you couldn't see with the naked eye.
I know some of my opinions on this scope make it sound like I hate it but it really is an excellent scope, I've shot another match recently and used it a but more and it really is a joy to use.
I do wish the FOV was better and the reticle was a bit different but I honestly think most people wouldn't notice these "issues".
I've shot it side by side with a few lesser scopes I own and played with a bunch of other scopes at matches and I think the Delta is a pretty sweet scope.
Interesting that you mention the XTR3 as it is the only scope in the price bracket that I would consider replacing the Delta with, once the illuminated models come out I intend to get a 3.3-18 so can offer a comparasion when it comes to market.