If I remember correctly, in Cantonese or Mandarin, copper and brass are either similar or the same in one of those Chinese languages even though copper and brass are quite different from one another. 
1 Thank
Thank you for your advice.
I will ask Hank for sure if the button is copper when I order it.
1 Thank
That’s interesting. Indeed, they sometime call copper as red copper and brass as yellow copper.
1 Thank
the word brass has been changed to copper now:
“The copper switch retaining ring sits flush with the copper button”
3 Thanks
Thank you for checking. I appreciate it.
As I have a red D3AA (519A 2700K Dedomed), for the moment, I will consider which emitter to choose. Many of my flashlights use Nichia’s emitters, so another one such as SFT-25R and NTG35 might be better.
1 Thank
