I prefer High CRI because it shows colors more realistically. Particularly things with Red in them.
you cannot keep copper from turning dark unless you paint lacquer over it.
you can make copper lose its patina, even inbetween the knurling, by soaking the light in ketchup… but, that produces a dull pink color, not shiny. Basically the vinegar in the ketchup, and the acid from the tomatoes, etches the copper.
when I want to polish my copper, I use a jewelers rouge cloth, or a yellow sunshine cloth. It only gets the high spots though…
the sw45k was a modification that I paid another member, to have done to my light. I have now bought all the tools to do my own LED swaps, but have not yet taken the time to take my cool white Tool apart. The LEDs themselves can be purchased individually , if you are set up to do your own mods.
I own a set of Maratacs with different LED mods, that lego to the Tool body
I find the tailswitch more convenient than a twisty.