Read this thread on the Brinyte B158 and watch all the videos. Follow the link to the reviews for this light
If you are new to flashlight modding, it sounds like this is a perfect starter host. And you can start with a Red LED and blank pills and move on from there. I can’t remember what the stock UI is, but when you build your custom pill, you can include a BLF A6 driver programmed for L-M-H