    def pick_led(self, inc):
        # Pick a random led, if it's off bump it up an even number so it gets brighter
        idx = random.randrange(0, self.layout.numLEDs)
        this_led = self.layout.get(idx)
        r = this_led[0]

        if random.randrange(0, self._maxLed) < self.density:
            if r == 0:
                r += inc
                self.layout.set(idx, (2, 2, 2))