Ok, I see what we are dealing with. I'd recommend removing the hood just to make things easier. there are tow screws on the bottom that you'll want to remove, they're on the left and right sides of the fan housing, take them out and the hood will come off. The lens is installed from the inside, its not meant to be removed or installed from the outside on these. You'll want to use a little glue to hold it back in place securely, my favorite glue for this is E6000, don't use much, just a couple drops up at the top. You're supposed to remove the entire hood to replace the bulbs on these, but like I said, its very easy to do, just remove those 2 screws and off it pops.