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Light sources play an indispensable role in our daily life. The present world cannot be imagined without the many different lamps, which are in use today. At night or when dusk falls they are needed, during work, at home and in traffic.Furthermore, many processes, such as printing, heating, drying, medical and plant irradiation, use lamps producing visible, ultra-violet or infrared radiation. These lamps can be as small as 0.1W and as large as 20kW, ranging from signalling purposes in a display to applications in lighthouses and stadiums.There are clear, frosted, white, colored and mirrored lamps. There are different types of lamps for different purposes: lamps for home and office lighting, for street lighting, for industrial lighting, for cars, for aircraft an for airports. There are security lamps, traffic lamps, projection lamps and photo lamps. Most of them exist in a multitude of wattages and voltages and with different lamp caps.
Some basic definitions
- Lamps - also known as bulbs are defined as the bulb or tube portion of an electric lighting device.
- Luminaire - A device or fixture that directs and controls the distribution of light from the source.
- Lumen - A measure of the amount of light from a source typically equivalent to the light emitted by one candle.
- Ballast - An electrical device required to operate electric-discharge lamp to obtain the necessary circuit conditions (voltage, current, and wave form) for starting and operating.
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