Architecture of HID bulb
HID bulbs are quite commonly used in most places these days. It becomes necessary to know what its physical architecture consist of. Unlike halogen lights which has filament in them to produce a light along with halogen gas, HID bulb makes use of the xenon and other noble gases that are filled in the tube with a tungsten metal.
These gases started reacting when the current is generated. The reaction between gases results in the formation of arc which produces light. The gases needed a sudden spark to start the reaction which is supplied by ballast through the metal conductor.
