I have a Thrunite TiS in pink (described as red when I bought it, but I really like the pink), which is ideal for my night runs, and a Ti3, bought mainly for the super-low firefly mode. Or should that be infra-low? What I like about them is that the threads turn very smoothly and easily, making one-handed operation a doddle. Both excellent value for money, too.
What I would definitely buy, if available, is a low-output single AAA light with a red LED- I'm trying to find one for my night hikes, but no luck so far. I'm sure I could bodge something with the Ti3 and some sort of filter, but it's not a very elegant solution. There could be a market amongst astronomers wanting to preserve their night vision as well as hikers.