Bizarrely interesting. I had no idea these things were that cool. My landlord, a throwback to the early 1900s, has them everywhere, and they're brighter than shit. They're cool to the touch, too, unlike most other lights, which fact kept me from unscrewing one at a diner two weeks ago until the waitress came over and nonchalantly stuck her fingers right on it. I was like 'woah bitch you gon get burnt up' and she was like 'nah' and then I was like 'snap that's some technology for you'.