Would be really interested in hearing how project 2 (DIY Lamp) works out. If you get it into a state that you are happy to share or go commercial.

I did see the Brighter and Rhythm lamps before but their way out of my price league.

In Edinburgh (Scotland at 56 deg N) during December, it's sunrise at 08:30 and sunset at 15:30. And there's plenty of folks at higher latitudes that may be interested as well.

Some people use stadium lights for this, such as this[0]. They’re very cheap but they’re not specifically designed as SAD lamps so I’m not sure how well they fit that purpose.

0: https://a.co/d/0gq5loUS

I definitely have no plans to go commercial (just started a new job, very demanding on my time), but I'll 100% open-source all the firmware/KiCAD/CAD/BOM/etc so folks can make their own.

My current "design" is basically just strapping all the pieces together, so it'll leave a lot to be desired in terms of aesthetics for folks who want it to be more nicely integrated into their living environment.