As an experiment, in my younger days, I decided to find out what exactly would happen when you connect a normal low voltage LED to 120V AC (house) current.

It glows very, very, very brightly. So bright, it lights up the whole room. If you turn it on for short bursts (on, off, on off), it will last some time. If you leave it on, eventually it burns out. Believe it or not, it's true... I also played with blowing up other DC type items connected to AC current, such as peizo buzzers. Those things get very loud as well, before dying.

Be careful.

Calvin