I don't personally use them - I prefer a reading lamp, but many people do use them and will, I'm sure, be happy to give you advice.
You basically have two options - the "clip-on" style of light, or the "illuminated cover" which Sony sell as an accessory for the 505, which is (as its name suggests) a cover for the 505 with a row of LEDs down the side, powered by batteries in the "spine" of the cover.
If you look in the "Reader Accessories" sub-forum you'll find lots of discussion about both these options.
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