That's not true at all since the LED's are wired in series so a single LED isn't going to get 12V, and you'll find a current limiting resistor in the fan to prevent the LED's getting damaged from too much current. The reason they are dim is because the LED emits a slightly different wavelength. The deeper blue LED's are always dimmer.
it will if they accidentally short out one of the led's.. especially since the cheap ones are not exactly checked well for quality assurance (I had one that the fan wouldn't turn at all because one of the blades hit one of the led's...) If you short out one led in series, the others are all subjected to higher voltage. The 3 mm led's have legs VERY close together, and when they are making like 200000 of them a week, they probably don't watch real close during assembly, they only check when one LED doesn't light... Normal reason for an LED not to light... Anyone, Anyone, Beuler... Beuler??? That's right... the wires are shorted together, just give them a little twist and your back in business.
