There are no uv light receptors.

What the hell are you talking about? You have UV cones in your eyes? You must see a shitload of extra colours compared to the rest of us. I saw a story about a woman with 4 colour cones, she could see like 10 thousand extra shades of green that normal people can't see. It's rare. But a UV cone? In a human? Never heard of such a thing.