I don’t know him personally, but I played against him in football back in the old days of the ECOL. It’s pretty cool seeing a local guy get this successful.

I would think the exterior side (based on the hard coat at the end), but I’ve seen it either way for similar optics.

I’m a coating engineer- I’m not just making it up.

Edit: and I’m agreeing that the technology exists already, but I’m saying it’s different (and performs different) from car tints.

A tint is different than a band pass in that it is usually either a polarizer (like sunglasses) or a neutral density filter in that it mutes light across the entire spectrum. Band passes look visibly clear, as all visible light would come through, but blocks the shorter (UV) and longer (IR) wavelengths. But agreed, the technology has been around for a while. I’m not sure when they were first designed, but I’ve produced anti-reflective coatings on chambers that are as old as the 1960s.

Somebody else kind of mentioned it, but this isn’t really new technology (at least not the coating). That is a typical band pass filter that blocks UV and IR, but allows the vis to pass. The siloxane final layer is interesting, and is likely for durability. Most band passes that my work has used/developed just end in SiO2 (which can also act as a hard coat). I think the biggest draw is the quantum computed design, but I think the traditionally designed thin film stacks perform well enough- the issue is actually manufacturing limitations: uniformity of the coating over large pieces of glass, large chambers needed to hold the glass, many layers needed lead to high cost, etc.