I’m surprised by how different these two lights look. The ROT66 was bought in December when Fireflies first advertised using the FA3 tint bin. The MF01s was also purchased then. The ROT66 has the least tint of any of my lights on turbo, but is otherwise just ok. The MF01S on the other hand is very pleasant.
My favorite SST20 is an Acebeam TK16. It looks greener than the Fireflies on a wall, but has a nice pleasant spill. Maybe the Carclo optics are superior.
ROT66 “FA3” on the left, Astrolux MF01s on the right: