Why doesn't sunlight through a closed window give a reptile the UV it needs?

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  1. Most glass or plastic blocks almost all UV
  2. Window glass makes UV too strong
  3. UV only reaches reptiles at night

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References

  1. Merck Veterinary Manual (pet owner): Providing a Home for a Reptile www.merckvetmanual.com/all-other-pets/reptiles/providing-a-home-for-a-reptile Checked 2026-10-11.

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