I found out that on the Glo it works only on the upper left till halfway down to slide the light, I tried the whole screen so I didn't got it working.. on the Aura HD it looks like it is the whole screen, but you have simply more space because it is bigger so it works the same there but by the size of the screen I thought it works on the whole screen.. yes.. stupid...
Still not used to the screen size difference ... I don't use the Aura HD much,I read mainly in bed and the HD is to heavvy with the sleepcover .. so thats why the Glo is been used more lately, maybe the H2O version is lighter..not much details on that one yet..