Hi manithree
Thank you for your comment.
The switch of using by K5s is OmTen PBS-101
http://www.kaidomain.com/p/S026961.DIY-LED-Flashlight-Reverse-Clicky-Switch-20_5mm-x-25mm-for-LED-Flashlights-2pcs
I choose this switch because of this can handle CREE XHP50.2 LED at high mode. Please don’t be worried. The quality is good. We will not choose to use any cheap components to build the flashlight.
I will pay more attention on that.
Thank you
Ban