Ok this is how I go the idea. My dad, has this U of M hat and it has a battery in it, and the block M will light up and flash when you turn it on. My idea is to put a very small Neon, on the underside of the lip on my hat. I got it all planned out except the power source. question is, what kind of battery would i need to say power the neon for like a couple hours atleast. Also would i need this to be AC current or DC? im thinking DC which would be very hard to do with a battery (like the one that powers a watch or my dads hat) this would be a great idea. Hell if it works out and i like it i just might get a patent market it.