I have this cable modem that's practically pointing at my be and if I look towards my feet, the super bright blue LED's are pretty blinding at night, not to mention they literally light up the room. You would think someone would have caught that by now at the factory and used a slightly darker color so as to not blind you when you look at the front of this thing. I really didn't feel like taking it apart since it also looks like the LED's are smd type and not our old round type which I do have, so here's what I did, but I also found what one other person did.
I have some leftover window tint and just cut a nice rectangle that would cover all the LED's. The reason I did this is because some of the green LED's actually turn yellow, and the blue are also a different color which is why replacing them would not be a simple fix either. This is what it looks like without the paper.
In any case, people should know how annoying these super bright LED's are on things like these or TV's. It wouldn't be bad if they were dimmer, but they are not. I usually change these to something red that's just easier on the eyes. Then again, many of the new LED's are so bright it doesn't matter what color they are sometimes. So you may want to check the specs first before buying them.
This is the other option if you do decide to open it up. It's a different model, but it's the same annoying LED's.