Mindy, there are a couple of good threads on lights. Start with the first URL and then move to the followup thread after. There are also some good photos for you to have a look at so you can see some of these lights in action. They are in the Sony forum, but they are just as relevant to any other 6" eink device.
https://www.mobileread.com/forums/showthread.php?t=9362
https://www.mobileread.com/forums/showthread.php?t=12668