I have a Sand-color Rocher F12, modded it with the Qlite (Nanjiq 4 mode-revision with Firefly) 3.04 AMP driver, and a Dedomed XM-L2 N/W, and modded the tube and cap to fit protected 3000 mah Litiums, and now this tiny light is a real barn-burner on high. Its brighter than my Modded Nitecore P25 with an XM-L2) im guessing the F12 i have reaches or exceeds the 1000 lumen mark. it beats my S20 ( and all my other small-form-factor single 18650 lights) very noticibly.
The total cost of the modds were still less than the price of the stock S20.