One I had almost completely forgotten about, but "rain" triggered something in the dustier corners of my brain. That and it's been pissing down with rain all day.
Sorry. I haven't yet watched the video. But a number of years ago I was involved with a company that produced high end LEDs , including for the US military.
I was told that white LEDs were expensive to manufacture and that most "white" LEDs were blue LEDs with filters.
It was green LEDs that were used for military purposes (landing planes on aircraft carriers) and the company had a patent for their method of producing green LEDs up to military standards.
I've been otherwise engaged.
King Charles the Spaniel can deal with his own vets fees.
I'd be done with the lot of them if it was left to me. And the aristocracy. The whole honours system can f*ck off too.