Hey bro, I can't really help much as my knowledge of current lights are a bit poor but try r/flashlight at Reddit. The people there are a knowledgeable bunch. Good luck!
Bro, have you checked lelong yet? Gadgetworld2u in Malaysia sells them and a whole lot more stuff. See here: https://www.lelong.com.my/nitecore-bp20-tactical-multi-purpose-backpack-gadgetworld2u-F517894-2007-01-Sale-I.htm
It's not one of the most popular lights but Fenix is generally a reliable brand. I would recommend the PD32 2016 as I feel that it's their best 1x18650 light now with the ability to tail stand and for general EDC use.
There should be a sheet that comes with the light itself which will have the instructions. Bottom line, click the button to switch the light on. Press and hold down to change modes. Click the button again to turn the light off. Double click to turbo. Triple click for strobe. That's all there is...
Neutral white tint are only available with TI unfortunately. I would recommend the rainbow PVD. However, S1A is available with NW tint. That might be a better option with more battery options and better mode spacing.
You choose correctly in regards to the TN12 2016. If you want a rechargeable version, go for the newer TC12 2016. I hope you picked the NW version which would be better for wildlife and inspection of locomotive for any defects?
However, I would return the Nitecore EA41 as there have been...