Well here is an image of my 2405 in the dark as best as I can get it.
Not much bleed but an overall 'glow' which I presume is normal, tried to get the grey of the screen in the photo to match the actual grey when viewed which is difficult, but it would appear very slightly darker than...
my screen has little backlight but is definately brighter than that! almost a uniform grey colour, ill post a pic up later and you can all judge for yourself....its a bit subjective though, ill try and get the 'on' light to the same intensity that you have lol