Ah, thank you for confirming that, yeah, I checked the gameplay video on YouTube after an hour and a half of playing and, I had a hunch those light refractors need to be aligned but spent 40+ minutes on that second one and just couldn't get it right. You can't win them all, still made for a nice post on Locals . :)
Maybe one day I'll open that vault. It's a cool project even not getting to the end. :)