In my Purina pamphlet that came with my chics 16 weeks ago...
Thanks for the pictures! I was able to find the pamphlet online to download and read. It does appear to be a reasonable guide for one way of raising backyard chickens. Lots of people do things a little differently, but I think we tend to recommend most of the same things that pamphlet recommends.
it states I should provide light for the hens now. At least 16 hours a day for egg laying. Any advice?
It says to provide light (16 hours per day), starting at 16 weeks old. It also says to expect the first egg around 18-20 weeks. Those two things probably go together: the extra light tells their bodies it's spring, so a few weeks later you start getting eggs. They do mention putting the lights on a timer, so the schedule is consistent, which that is a very good idea if you are going to use lights.
Some people say not to add lights, because the chickens' bodies need a natural "rest" in the winter. Yours haven't done any laying yet, so I don't think they need a rest.
Some people say not to add lights because you don't want the pullets to lay "too early," which could be bad for them. But if they were raised at a different time of year the days would naturally be that long, and they would start laying at an equally young age. So I don't think it's a big deal either way.
Some people just don't want to bother with lights, and their chickens are fine but don't lay as many eggs during the winter months.
If eggs are important to you, lights are probably best. If the chickens are just fun pets and you want to keep things simple, feel free to skip the lights.
I just started them on egg laying feed.
The pamphlet says to start layer feed at 18 weeks or when you see eggs, not at 16 weeks. They also say to switch away from layer feed any time the hens are molting or when the hens get too old to lay eggs. So if you are trying to follow what the pamphlet says, they should still be on a starter or grower feed at present.
If you do not use supplemental light, and they take longer to start laying, then it might be quite some time before they need the layer feed.