My vet told me that my birds (parakeets like in the below image)
[![bird][1]][1]

may have calcium absorption problems in the long term because their exposition to UV light is low (they do not receive direct sunlight, only through glasses in a balcony). I was looking for UV lights for birds in amazon and all I found was some black bulbs which need a socket (the classic bulb everyone has at home but in black instead of white) and that would require a somewhat cumbersome setup given my home and specifically the place where I intend to expose them to the light.

Then I looked for UV lights in general (not specifically for birds) and I came across with this specific item:

[![UV light][2]][2]

its description says that its wavelength is 395 nm whereas the description for those "specific for birds" bulbs do not specify wavelength/frequency. Both lights do specify they are also useful for checking counterfeit money, if it's of any help that they have this in common (similar wavelength maybe)

My question is: given that the linked item is convenient from a setup perspective, **is it safe/good for my birds even if its description doesn't say so?**

Bonus points for recomendation on how much time of exposition and best time of the day I should expose them to the light 

  [1]: https://i.sstatic.net/CjU3G.jpg
  [2]: https://i.sstatic.net/qyeum.jpg