I use the PRS-900 cover with light as well.
Initially, I was pretty disappointed with the light because it illuminated the top half of the reader fine, but the bottom half of the screen was very poorly lit. However, I now position it from a side angle that makes my reading experience absolutely wonderful. Hopefully, I can explain this well enough:
Lifting the light stick from its compartment in the cover I pull it straight up toward the top of the reader, fully extending it. I then bend it in a "U" shape with the head of the light facing back down toward the bottom of the reader. Then with the light itself, I angle it toward the screen/right side of the reader and it lights the entire reading surface with no glare and no dark spots.
I learned this was the best angle for reading (for me?) when I used the PRS-600 light cover for my PRS-505 in the past.
Hope that helps!
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