Looking for medium sized light, say 1 or 2-AA size, though rechargeable would be ok too. But the problem is it should have a side switch and be very simple to operate. It's for a senior who has some memory problems and so he's not going to be able to use any modes. Ideal would be something like: one side-button that just single clicks to cycle thru high-low-off. Anything involving press & hold, or more than one button, etc. won't work. Does such a light exist? I can't find one yet, though I haven't looked at hardware store junk - was hoping to get something high-quality. Thx.