I tend to obsess about finding the perfect solution for things, and this happened also with my search for a light for my new kindle touch, that I absolutely love. I ended up trying 7 different lights, and will post this comparison as a review for all of them. Hopefully others can benefit from my experience...
- Might Bright XtraFlex2: It is, indeed, mighty bright, but more in scope than in intensity. It casts light on a HUGE area, enough to disturb my partner in bed... On the kindle itself, it is only slightly brighter than other lights. Not enough to justify its size in my opinion. Which brings us to its other flaw - it is BIG. The clip is too large to clip straight onto the top of the kindle. I had to clip it diagonally. It seemed to work and be stable that way, but it is a big beast, and would not be convenient for travel, for me. Given that the illumination onto the kindle itself was only slightly brighter than other lights, I didn't think it was a good solution.
- Verso clip-on: Good travel size, very very blue light, not very bright, and it actually POPPED OFF my kindle when I tried to adjust the head of the light to shine in a slightly different direction. And while it's fairly small, it does not fold in any particular way, so it's not very compact.
- Verso Arc: Nice form factor, but I found the bright but somewhat uneven, and worst of all (which is why I returned it), if I held it in bed in a particular angle that I happen to like, the light reflected off the top of the screen in a really annoying way. Also, the light was VERY much on the blue end of the spectrum ("cold").
- Octovo: Also a compact light, but I found it very weak.
- Belkin Clip-On: As *light*, this was the best light of all. It is the only one that was truly "warm" (more like daylight), rather than blue. I loved the *light*. BUT, it is NOT adapted for the kindle touch!!! The adapter they send is for the kindle *keyboard* (as off Dec 2011). It just keeps falling off the kindle touch. With tried it with my partner's keyboard, and it fit perfectly. So watch out for that. Furthermore, it IS bulky. I could live with the bulk because I loved the light itself so much, but if it keeps falling off, that makes it useless. If they ever come out with a version for the touch, I might buy it just to have by the bed, and use another light for travel (see below).
- Kandle (regular): Form factor wise, it is the nicest and most elegant. Fits on the Kindle like a glove, and even fits into my Belkin sleeve for the kindle. Yes, the light on the screen is a bit uneven (weaker at the bottom or on the further side, depending on whether you have it mounted on the side or the top), but not terribly so. BUT it has two major flaws. (1) When you close the lid, the light does not shut down automatically. And once it's shut, you don't notice it's on. Easy to go through a set of batteries per day in this way... And (2), the on/off button is too easily pressed. I pulled it out of my purse to find the light on, when I know I shut it off. So if you'll have it anywhere where it might come in contact with other things, again, watch out for battery issues...
- Kandle Flex: This is the one I ended up with. Again, like the other kandle, fits on the kindle like a glove. It's very compact, easy to adjust the direction of the light without disturbing the base (unlike the mighty bright or the verso clip-on), very compact, small form factor, and decent light. Because the direction of the light is adjustable, it's easy to get relatively even light throughout. The only negative I have is that the light is not quite as warm as a the belkin (but I am not sure it's doable with "watch" batteries), and is a touch weaker than I'd like, again, I think because they use watch batteries. In exchange, you get a very nice, light, compact form factor. So, while not perfect, it is, in my opinion, the clear winner in this lot, and the one I ended up keeping.