what light housing do I need

I have a pool light that the gasket was covered with grease, but there was water on the inside. I was told there should not be grease on the gasket. I bought a new gasket and decided to purchase a very expensive LED bulb. It worked for about 2 weeks then no longer worked. I pulled the unit out and it was full of water. I think there is something wrong with the unit. I hold it under water and never see any bubbles. The clamp is as tight as it will go. No one can tell me what I need to buy to replace it. I am including pictures of the unit with all the numbers.