it was me simply get the mouse open, check size of led (3 or 5 mm) get led in matching shape, desitred color, as bright as possible, small "radiaton angle" and change them, should be normal 2.7 - 3.2 volt leds. little tip: take infrared leds, nobody will see ya mouse doing anything, no lights, no balls ;D
but it works ( i've never seen my name crippled as often as in this thread)