O.K.. Thanks.. I will try to simplify.. When you read in lower light conditions it would seem to me that it would be better to have the type in white on a black / dark background. ( at least have the choice ) The Kobo can obviously produce white or black as a background.. you must be able to change it.. There is a picture on this forum site somewhere where a user is having trouble with his display on his Kobo. He has two pictures showing his Kobo. In one shot he is holding the device with the type in black over a white background. this is the standard way that the Kobo comes out of the box .. .. in the next shot he is holding the device with white type over a black background. We want to be able to change to either one...