DIY Perks also attempted to make artificial sunlight at home, also focusing on things like Rayleigh scattering! This was a great watch:

https://www.youtube.com/watch?v=6bqBsHSwPgw

EDIT: After reading the article, I see the OP calls out DIY Perks specifically - the OPs design is much more compact :)

> It's compact. The total size is 19cm x 19cm x 9cm. This is quite compact for a 5cm focal length and an effective lighting area of 18cm x 18cm. Reflective designs like the DIYPerks video or commercial products like CoeLux do not achieve this form factor.