Mysterious recessed light - what is this?

Hello! First time poster on this sub but have been reading — grateful for the help and expertise. My house was built in 2003. It’s great, but I’m trying to switch from halogen to LED for efficiency. mostly I’ve been able to figure it out with enough Google lens Mostly I’ve been able to figure it out with enough Google Lens searches and looking on this sub. But what the heck is this and how can I replace with LED? I tried to remove the glass disc, but unlike previous I tried to remove the glass disc, but unlike previous types of fixtures in different parts of the house, this one seems solidly in place and difficult to remove. Not sure I can remove without breaking. Thank you!