The majority of my reading time is without a light, mostly because I prefer hauling around the reader in the slimmer cover without the light, and not having to carry the clip-on light with me (I hate carrying a purse, so it's whatever I can stuff in my pockets, and the less, the better). For my eyes, by raising the contrast and lowering the brightness on the reader's settings, and using a bolder font, lets me read in dimmer light very nicely without any eye strain. I wouldn't be able to read a paperback book in that lighting, so those settings make a huge difference. You just have to experiment and find your comfort level.
When I do need to use a light, the Verso rechargeable clip-on mentioned above is very good, as is the Sony cover with the light, I switch between those two.
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