Hens who are prone to internal laying, false laying and other ovarian infections (most high production hatchery types) will probably not be well-served by pushing them to lay with artificial lights. I don't use artificial extended daylight, though I did the very first year. Of those girls I started with, the original ten, I've lost five, plus one younger one, all to internal laying and in addition to that, two more of the originals are dying from the same thing.
I suspect that the more ornamental breeds and ones who brood chicks a couple times a year will live longer than the typical common types the hatcheries sell for egg production.
Layer feed won't shorten their lives; in fact, it's exactly what they need for their daily nutrition.