> It's easy enough to replicate the "wake up in the light" experience in your bedroom

No, it absolutely is not. Light you get from some Walmart alarm clock is the wrong temperature, the wrong CRI, and about 1/1000th of the right intensity.

You can replicate it for the low-to-mid 5 digits: https://www.coelux.com/

That's because people don't actually want a portable sun (say, 10-20k lum D65) in their room. If you do want one, you can buy one for less than $100, and plug it into a $10 timer.

You're buying into their marketing pretty hard...