Cooper,
Since we live in a town that hasn't yet become enlightened about raising chickens in your backyard and because of the circumstances we are in, our chickens are living in a coop that has been built inside our garage. Their are a few windows in the garage, but we've covered them with cardboard so that neighborhood kids (and adults) can't snoop around and look in. So, it's pretty dark there with just a little light that gets in around the edges. Thus, the idea of "Stealth" chickens.
Anyway, I would be cruel if I let them stay in the dark, would never do that. So I have a fixture with a few small appliance lights on it, as well as one of those red heat bulbs. I have them set so that they can come on independently, when it's fairly warm, I light the coop with the small bulbs, it's a mellow warm light, and if it's cold I unscrew one or more of the bulbs and use the heat lamp.
There is a small run that Rick built on the side of the garage that the coops opens into, so they do get out during part of the day, but this has to coincide with the working hours of our closest neighbors. So they don't get as much natural light as I'd like. This is not what I believe to be the best system, but is the best I can do for them right now. As it's winter in a northern state, light would be a problem even if they weren't stealth' chickens. I would still supplement the daylight to a small degree with artifical light just to replicate the natural daytime light. I feel that this is best for the overall welfare of the chickens, and as a bonus I still get to have pretty much normal egg production. Like you, I'm not trying to make money, just have some eggs for breakfast and a few for my kids.
A normal day with light would be 12-14 hours in most places. I was only wondering if your chickens were going outside or not, and getting daylight, and if so do you really need to add light? I wasn't criticizing you, you asked for advice and I was trying to see what kind of advice I might be able to give you that would make sense. It helps to know what your situation is before assuming what you need. Sorry if I offended, I mentioned that maybe I was misunderstanding, maybe you scanned past that.