Really neat, thank you for posting. I took a different angle when trying to figure this out - my goals were high spectral similarity to the sun, high brightness, adjustable warmth, and low cost. The existing lower-cost solutions people have posted about end up with high brightness, but the lights are evil.

I ended up with a photography light that's /alright/. It's not nearly as bright as I want, and I can't automate changing the warmth. When I next take a crack at this, I'll look deeper into some of what you've posted about here.