Originally posted by Richard D
The big question is can I fix a red LED to the front to make me look like a borg 
Actually, that'd probably be a fairly simple thing to do. All you need is a single AA battery, a resistor, a small switch, a short length of wire and an LED.
Solder the resistor to the anode leg of the LED and the positive side of the battery (via a short wire with the switch) and a wire between the cathode of the LED and the negative side of the battery. The value of the resistor is fairly critical so as not to burn out the LED, and will depend on the ratings on the LED. Running from a single battery (1.5/1.2V) you probably won't even need one for most LEDs.
Duct tape the battery somewhere out of the way on the helmet, cut the leads short on the LED, superglue it to the mirror, and voila! you have been assimilated.