photoelectric light bulbs?

Question

A string of lights with candle flame shaped bulbs that when plugged in look like there is an actual flame burning in them. How do they work as opposed to a regular light bulb with a filament

Answer 1

These?http://ghoulskool.com/lights/flame06022.jpg
They're neon discharge lamps.

This article gives you an idea of how they work:
http://en.wikipedia.org/wiki/Neon_lamp