I have been using full spectrum lighting for my birds for as long as I've had birds. Sunday I bought a brand that I had never bought before. Zoo Med Repti-Sun. They were 3 times more expensive than any of the other lights I have bought. I used one for Buddy and Harriet when I set them up in a breeding cage. The manufacturer suggested that the light had to be 18" away from the birds in the "burn in period". I actually allowed a little extra space to be on the safe side. Well within a day and a half of using these lights Buddy and Harriet were on the bottom of the cage, eyes closed shaking their heads. Since I have another pair in the same exact setup except for the light I figured that must be it. I shut off the lights and misted them (which they really enjoyed). I have kept a close eye on them and have been very concerned that they continued to keep their eyes closed. I spoke to my Avian Vet this morning and was advised to not use those lights. Apparently they have been linked to cataracts in birds. He says they probably got a sunburn on their eyes and eyelids. He suggested to continue misting every couple of hours. They are opening their eyes a little bit this morning so I think I have dodged the bullet. Whew! Since I had never heard of this kind of thing happening and it certainly has never happened to me before I thought I would post it. To warn people who may be considering using these lights and I'm curious if anyone else has had this kind of thing happen.