You can take them apart, but you have to be careful. The two parts are glued together, but you can get a small screwdriver in between the two parts and maybe pry them apart. But the parts might break. I would only do it if it is actually leaking. I had to do one of mine since it was leaking and the metal reflector had come loose and was rattling around in the light. I glued it back together with some clear silicon sealant.
Good luck!