Souvenir Jar Light with GlassJar Light with Glass you can use jars to make pendant lights, lamps, chandeliers and lots of other great things. Jar Light with Glass what were lightning jars? A lightning jar had a glass lid attached to the jar via two pieces of wire (referred to as wire bails), which acted both as a hinge and a locking mechanism for the lid. A rubber ring was used between the lid and the jar rim to actually effect a seal on the jar.