viper... LED's in mice are classed as CLASS 1 (or class 2 not sure) LED laser devices I think... not a laser in the true sense of the word but because they shine light at restricted wavelength and at specific intensities they can be considered mildly dangerous to your eyesight (lot of H&S beaurocracy bollocks if you ask me but hey... I wear contact lenses so what does that tell you).

like I say evidently its possible but you might loose a little responsiveness in the mouse if you aren't careful.... be interested to see any pics if you do it though

Z