I have a desk lamp that uses G4 bi-pin light bulbs.
The socket is marked "JC G4 12V max 20W". I was wondering what the "JC" means, so I googled "JC G4" and indeed a lot of results show up, some with "JC type bi-pin" in the name.
However, I can't find what exactly is a "JC type" light bulb. I thought the "G4" already mechanically describes the light bulb.
Best Answer
JC : J From the word “Jod” – It means “Iodine” in German and indicates that it is a Halogen lamp. C From the word “Cine” Indicates that the primary application for lamp is Cinema but can include Optics & Projection & Other Markets
This halogen bulb is a low voltage bulb, commonly found under counters, in desk lamps, or as accent lighting. This type of bulb can be be purchased in various low voltage amounts, ranging from 6 to 28 volts. This bulbs come in capsule shape and have two pins at the base of them. There are two different sizes, a G4, which is 4 millimeters between the pins on the base, and a GY6.35, measuring 6.35 millimeters between the pins on the base. Just like the J type bulbs, a JC halogen shouldn't come in contact with bare skin since it can damage the bulb.