def use_rbg():
    """
    Swaps the Green and Blue channels on the LED backlight
  
    Use if you have a first batch Display-o-Tron 3K
    """
    global LED_R_G, LED_R_B
    global LED_M_G, LED_M_B
    global LED_L_G, LED_L_B
    LED_R_G, LED_R_B = LED_R_B, LED_R_G
    LED_M_G, LED_M_B = LED_M_B, LED_M_G
    LED_L_G, LED_L_B = LED_L_B, LED_L_G
