I recently purchased a new Cal Spa Victory 100. I called them about purchasing a blue lens cover for the underwater light. They told me that the lens cover they sell only covers the interior circle of the light, not the outer rim also. I tried one like this, and the ring around the outside which is around 3/4 inch is not covered by the blue lens, and thus lets a lot of white light out.

What I would like to have is a lens cover that covers the entire light face, or some way of coloring what I do have. The guy at Cal said that some type of blue film inside the light housing may work, but I don't want to catch anything on fire or melt it. Any ideas on where I can get a blue lens cover or another remedy?

The entire lens diameter that needs to be covered (round) is approximately 6 1/2 to 7 inches. Thanks!