O.K. This may not be very helpful, but it should give you a good idea.

I'am currently taking Systems and Control in Technology class, and I learned a thing or two about LED's.

Note: Curcuit boards come into this. And it gets a little too technical.

Red LED's should work best for realism. LED's require souldering and computer programming. The Switch programmes should work best for Computer programming. (Remember, starting from the top left clockwise.) LED's are available to buy at workshop stationary stores. Install the curcuit boards inside the Proton Pack in progress and soulder in the LED's, add a switch. (Outside the Pack itself.) It should work. If it dosen't, don't worry. This isn't a very good guide, and installing LED's can be very difficult.