@Meaningness I recently started the project of setting up a good light box based on your guide.
But then I was setting up a studio for a different project, and I learned about softboxes like this one: https://www.amazon.co.uk/BPS-2850W-Photo-Studio-Softbox/dp/B008MV2N36/ref=sr_1_11?s=photo&ie=UTF8&qid=1513770630&sr=1-11&keywords=softbox+stand …
That's 50k lumen, same price, less effort!
Nice find! I looked for photographic lights as a possible approach, a few years ago, but didn’t find anything with nearly as good a lumens/price ratio as that