An electric chair AND LEDs, oh my. However, this instructable is more about a demonstration on the coefficient of thermal expansion between different materials. Before I lose your attention, did I say that there was going to be molten glass, LEDs, AND an electric chair ( in this case, a small chair like object with current running through it).
I used copper wire that was twisted and crimped to make part of the simple circuit. Since this will be encased in 2000 degree molten glass, I am pretty positive that solder won't hold up too well.
I am just guessing, but things like IC chips and mosfets won't hold up to 2000 degrees either.
I did not want the copper too thick because there is a good chance the glass will crack. This will be explained later.