One of our 3rd grade teachers recently got some classroom light filters for her class. I was so amazed by how these made such a calming effect on the harsh fluorescent lights that I decided to get a set for my classroom too. I am so glad that I did. They were super easy to put up. They have little magnets and stick right on top and fully cover the lights.
Amazon. I had meant to take some pictures but kept forgetting all week, but at least you will get the idea from this picture.