I cannot answer clearly to that Clemence! I believe that maybe it was because of the projection of the light? Maybe it wasn’t as much divulged as it could!
About maukka’s information, it is diluted within the 2 threads that I mentioned above. At least here in BLF there is no review thread that I could find!
BLF: Search results for '' - BudgetLightForum.com
Even on YT there are not many results: https://www.youtube.com/results?search_query=wuben+to50r+review

Maybe that is the reason why they want to give a new try to this light, I don’t know!

Quick Update:
As I mentioned, I sent PM to Wuben and got a reply from Jelina (last Friday)! The conditions she/Wuben proposed didn’t seem the best considering what is being discussed here about the already proposed conditions.
So I replied back (last Friday), being completely honest that the situation wouldn’t improve with those suggestions. I am now waiting for some more info and will post as soon as I get it!