Perfect driver with adjustable modes and 1V-4.2V Input voltage?

Similar to what can be found in lumintop SD10, but with reverse polarity protection and adjustable modes, down to firefly mode.

Is there such a thing?

I think that there is a very good chance that the SD10 actually uses two different drivers in one. A boost driver for the 1xD, and a buck/boost or linear driver for the 3xAA or 1xLi-Ion.

I wish. I'd like to build some AA flashlights, but I don't know of any drivers worth using. AA & 14500 flexibility would be even better.

Hi Matt. When do you think you will have this driver ready for production?

I need to buy my McCLaren P1 first, but after that I promise.