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From what I have read, this is the way I understood it works. Although the vitamin is provided in the food, it can not be utilized efficiently in that form. Through sunlight, the bird take the vitamin and its body changes it to another vitamin. I wish I could quote you the exact way it works but my memory fails me.
Another aspect to consider is that birds normally get sunlight in the wild so if they bird can get natural light, I am sure that is a good thing. If people who have birds with behavioral or health issues, I would seriously consider artificial lighting for sure. I will install a light recommended by a user here, Joel. Here is what he uses:
4ft. long fluorescent fixture (shop-lite type) with an electronic ballast (do not use a magnetic ballast). We burn 2 Philips F32T8TL950 tubes in this fixture (these are considered the best available by some of us).
By eliminating UV light, you actually take part of the birds natural color spectrum away. We only see red, green and blue but birds see UV. For example, female budgies actually choose mates partially based on their bright markings which are illuminated by UV light. I would think breeders could see increased activity with breeding pairs often by utilizing UV light. This is my opinion as I am not very experienced in the subject. I think Parrots of Oz talks about this.
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