A:
I really doubt you will need a light, this sight is very bright and I have hunted with it in the evening. Now if you are somewhere that you can hunt at night that is different, but even with moonlight this sight is bright enough to shoot.
The sight does not have markings beyond 60 yards on the tapes but depending on your mounting you may be able to add a mark beyond the 60 mark on the tape.
I admit, I am not good enough to take game that far out, I really rarely shoot beyond 45 yards but if you are that good you might be able to add another 5 or 10 yard mark depending on the speed of your bow.
The slower your bow the longer the distance between marks so you could run out of travel. They also give you some blank tapes so you could set up your own markings. I am shooting a Bowtech Allegiance with this sight and there is room to add another 10 yard mark at the end of the tape I think.