I’ve installed a few projectors like that in home theaters up in the Vail and Aspen Valleys over the years. Digital Projection Inc, the biggest units I put in were about the same size as the one in the OPs photo and were located in a separate projection room with the image showing through a glass port in the wall as the projector fans and light bulb made way too much noise to actually put it in the actual theater room itself. They were 3 chip projectors and used prisms and I don’t remember what the bulb technology was, it wasn’t anything that looked like a light bulb in any way but it was like a big copper coil that struck an arc which created the required light.

They sold in the $300-400k range, bulbs were closer to $10k from what I remember.

The newer ones have gone down a little bit in size and are a bit quieter as they use a laser for their light source these days. This one still sells for $250k.

https://www.digitalprojection.com/en...ser-8k-gen-ii/