Yeah my external HDD has a blue LED that's so ridiculously bright it lights up the whole room and puts a really bright blue spot on the other side of the room.

I tried covering it with a post it (several layers) and after a month I noticed that the yellow colour had whitened completely where the LED is. Probably contains an unhealthy level of UV as well. Yuck.

I tried opening it up to replace the LED but it's clipped somehow. Very hard to open without damaging it.