Someone back in the early 80's did the amulet. I was pretty young but remember it being very spot on to the original as far as I could tell from HBO reruns. It did not light up. I had one i had bought in England on a visit. No idea what ever happened to it, but they must be out there.
It was the main character from this film, where I got the idea to name my daughter. We changed the spelling from Galen, to Gailin, to make it more feminine. It wasn't Peter MacNicol that impressed us... Just his character's name. :lol