This subject returns to the Forum Board at least several times each year.
Years ago, the use of UV lighting for Parrots had been technically proven not to be of benefit, in fact, can be a detriment to them resulting from the likelihood of Blindness and Skin Burn.
Replace the standard lightbulbs that are in use near your Parrot with Daylight Series LED standard bulbs. NOTE: it is important to remember that adjusting the light to duplicating your normal Sun Light Schedule in your area as one can screw with your's and your Parrot's Natural Body time.
I agree with what everybody here has already told you and if u live in a cold climate with a super cold winter I understand it can be hard to give ur birds vitamin D however if you put a cloth a the bottom on the window so no drafts get through u can set them next to the window for like 20 minutes it's not as good as being able to put them outside but it works
I use a full spectrum bulb. It's not UV, it's just regular full spectrum. I have used it for years and definitely see the health benefits. My girls look great LOL!