I was under the impression the 21700 C8F’s from amazon were the units with the good drivers. I ordered one to compare to the 2 I have. Sofirn has replacment drivers on the way so I guess I need a 3rd driver. I thought the issue was fixed. Oh well, guess I will contact Sofirn if it does not reach 3000 lumen. The 2 I have didn’t even test as bright as my 18650 c8f’s.