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B&H Photo - Introduction to Lighting - Part IV
 

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Introduction to Lighting

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Lamp Type

Incandescent Lamps


An incandescent light bulb works by heating a solid filament so intensely that the filament’s thermal radiation includes large amounts of visible light.

 

Fluorescent Lamps


A fluorescent tube contains mercury vapor that is ionized by an electrical current flowing through the tube, which is then transformed into visible light by striking fluorescent phosphors that coat the inner surface of the tube.

 

Gas Discharge Lamps


A gas discharge lamp is a lamp often filled with high-pressure mercury, sodium vapor, xenon or even neon that is excited by an electrical charge to produce visible light with specific color characteristics.

 

Electronic Flash Tubes


The typical electronic flash tube is constructed from glass or quartz and comes in a variety of shapes. The tube is filled with the inert gas xenon. Electrodes are attached to each end of the tube. Applying a high voltage pulse to the “trigger” electrode on the tubes surface, ionizes the xenon gas in the flash tube. This makes it conductive and permits the tube to discharge the stored energy held in capacitors in a fraction of second, producing a powerful burst of light.

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