I have the Latitude and the light from M-Edge as well. I like the case except for the lint from the fleece lining but I don't really like the light. I did at first but I don't find it bright enough to light all the way to the bottom of the screen and my light unclips when I swivel it too. I just snapped it back it so that was easy to overcome but I really don't find it bright enough.
I ended up buying the Mighty Bright Travel Flex light. I found it at my local Chapters store here in Canada. I looked for them at Borders in the States but didn't find them there. They have Xtraflex but I found it too big and bulky for my tastes. I really like the Travel Flex and it fits inside the front zip pouch of the Latitude case.
It sometimes gives off a glare spot but I find I can angle it to make it go away. It runs on 1 - AAA battery that it comes with.
My other issue with the M-Edge light and the Latitude case is placement. I don't like having the light at the outside back of the case. It's the brightness issue for me and the fact that I can't fold the front of the case to the back to make it comfortable to hold while reading. Instead, I fold the front part of the case to the back and slip the light under the reader itself. It's not where it's supposed to go but it's how I got it to work until I bought the TravelFlex light. I much prefer the TravelFlex to the M-Edge light.
http://www.mightybright.com/Book_Lig...uctDetail.html