I have full spectrum bulbs with UVA and UVB rays for the birds. They really like them because they can see in the UV spectrum, and it helps them process calcium. I get them from a company called Featherbrite. I have them in clip lamps on top of the cages. Our modern windows block most of the UV rays, and the birds need sun. Since I live in a climate that has a winter, it isn't possible for them to get outside a good portion of the year. And now with West Nile virus in my area, I'm afraid to take them out. The vet agrees they should stay indoors but have the lights.
They do seem to become a lot more active when I turn the lights on. And at least one of my birds seemed to become healthier and happier once I got them.
Yes, 10-12 hours is about perfect for sleep.
It's great you talk to her about anything, including what you have learned. I strongly suspect my birds know a lot more than what they can say. I can ask them things and get a response. For example, I can ask if they want the TV on, or want their lights on, or if they want their veggies, and they will chirp back if the answer is yes. And once in awhile my Nanday will say something completely appropriate to the subject that she has never said before, and nearly bowl me over. She is TV addicted and I suspect over the years she has learned all kinds of things I don't know! So yes, keep talking. More might be getting through to her than you realize.