Photography Lamp Types
There are various types of lamps used for photography lighting. These include incandescent lamps, which work when a solid filament is heated intensely and the filament's thermal radiation gives off of visible light. Fluorescent lamps contain mercury gas which is ionized by an electrical current flowing through it. It is then transformed into light by contacting fluorescent phosphors which coat the inner lamp. Electronic flash tubes are generally made of glass or quartz and come in various shapes.
The tubes contain the inert gas xenon. Electrodes are attached to the ends of the tube. A high voltage pulse triggers them and ionizes the gas. This makes it conductive and enables the tube to produce a powerful burst of light in a fraction of a second. A gas discharge lamp usually contains high-pressure mercury, sodium vapor, xenon or neon which is excited by an electrical charge to form visible light with specific color properties. These lamp types can often be bought for less than $10.