Timeline of lighting technology

A candle is a light source usually consisting of an internal wick which rises through the center of a column of solid fuel. Typically the fuel is some form of wax - paraffin wax being the most common. However in recent years new soy and vegetable candles have become popular. Prior to the candle being ignited, the wick is saturated with the fuel in its solid form. The heat of the match or other flame being used to light the candle first melts and then vaporizes a small amount of the fuel. Once vaporized, the fuel combines with o ...

Including:

• Candle - Usage
• Candle - Religion
• Candle - Measurement
• Candle - Fuel and candle holders
• Candle - Hazards

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An arc lamp is a device that produces light by the sparking (or arcing, from voltaic arc or electric arc) of a high current between two carbon rod electrodes. The rods are touched and then slowly drawn apart; as the rods separate the current is "struck" and arcs across the gap in a bright, ionized path. The arc produces a temperature of several thousand degrees, and the tips of the carbon rods are heated to incandescence, creating light. The rods are slowly vaporized during the process and need to be regularly adjusted to maintain the ...

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The invention of the light bulb is usually attributed in Britain to Joseph Wilson Swan and in the United States to Thomas Alva Edison (who first marketed the device successfully). However, it is now believed that Heinrich Göbel built functional bulbs three decades earlier. Alexander Nikolayevich Lodygin developed an incandescent light bulb around the same time. Many others also had a hand in the development of a practical device for the production of elect ...

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Incandescent light bulb, Incandescent light bulb - History of the light bulb, Incandescent light bulb - The halogen lamp, Incandescent light bulb - Comparison of electricity cost, Incandescent light bulb - Standard fittings, Incandescent light bulb - Efficacy and efficiency, Incandescent light bulb - Power, Incandescent light bulb - Voltage light output and lifetime, Incandescent light bulb - Heat

Read more here: » Incandescent light bulb: Encyclopedia II - Incandescent light bulb - History of the light bulb

The invention of the light bulb is usually attributed in Britain to Joseph Wilson Swan and in the United States to Thomas Alva Edison (who first marketed the device successfully). However, it is now believed that Heinrich Göbel built functional bulbs three decades earlier. Alexander Nikolayevich Lodygin developed an incandescent light bulb around the same time. Many others also had a hand in the de ...

See also:

Incandescent light bulb, Incandescent light bulb - History of the light bulb, Incandescent light bulb - The halogen lamp, Incandescent light bulb - Comparison of electricity cost, Incandescent light bulb - Standard fittings, Incandescent light bulb - Efficacy and efficiency, Incandescent light bulb - Power, Incandescent light bulb - Voltage light output and life, Incandescent light bulb - Heat

Read more here: » Incandescent light bulb: Encyclopedia II - Incandescent light bulb - History of the light bulb

Prior to the domestication of electricity, candles were a common source of lighting, before, and later in addition to, the oil lamp. Due to local availability and the cost of resources, for several centuries up to the 19th century candles were more common in northern Europe, and olive oil lamps more common in southern Europe and around the Mediterranean Sea. Makers of candles were known as chandlers. Today, candles are usually used for their aesthetic value, particularly to set a soft, warm, or romantic ambience, and for emergency lighting during electrical power failures. Scented candles are common in aromatherapy. Small candles are ...

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Candle, Candle - Usage, Candle - Religion, Candle - Measurement, Candle - Fuel and candle holders, Candle - Hazards

Read more here: » Candle: Encyclopedia II - Candle - Usage

Lead glass tubing in external diameters ranging from about 8 to 15 mm is most commonly used. The tube is usually melted into shape using small torches that run on a simple combination of natural gas (Butane or Propane work better, however natural gas is cheapest) and air. An electrode is melted (or "welded") to each end of the tube as it is finished. The electrodes are also lead glass and contain a small metal shell with two wires protruding through the glass to which the sign wiring will later be attached. All welds and seals must ...

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Neon sign, Neon sign - History, Neon sign - Manufacturing process, Neon sign - Applications, Neon sign - Images

Read more here: » Neon sign: Encyclopedia II - Neon sign - Manufacturing process

The problem of short lamp life is addressed with the halogen lamp, also called the tungsten-halogen lamp, where a tungsten filament is sealed into a clear "capsule" filled with a halogen gas such as iodine or bromine. This creates an equilibrium reaction where the tungsten filament that evaporates when giving off light is chemically re-deposited at the hot-spots, preventing the early failure of the lamp. This also allows halogen lamps to be run at higher temperatures (which would cause unacceptably low lamp lifetimes in ordinary incandescent lamps) allowing for g ...

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Incandescent light bulb, Incandescent light bulb - History of the light bulb, Incandescent light bulb - The halogen lamp, Incandescent light bulb - Comparison of electricity cost, Incandescent light bulb - Standard fittings, Incandescent light bulb - Efficacy and efficiency, Incandescent light bulb - Power, Incandescent light bulb - Voltage light output and lifetime, Incandescent light bulb - Heat

Read more here: » Incandescent light bulb: Encyclopedia II - Incandescent light bulb - The halogen lamp

A kilowatt-hour is a unit of energy, and in the United States this is the unit in which electricity is purchased. The cost of electricity in the United States ranges from $0.08 to $0.12 per kilowatt-hour. The following shows how to calculate total cost of electricity for using an incandescent light bulb over a compact fluorescent light bulb. (Also note that 1 kW-hour is the same as 1000 W-hours). Electricity Cost (for cost of $0.10 per kW·h) < ...

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Incandescent light bulb, Incandescent light bulb - History of the light bulb, Incandescent light bulb - The halogen lamp, Incandescent light bulb - Comparison of electricity cost, Incandescent light bulb - Standard fittings, Incandescent light bulb - Efficacy and efficiency, Incandescent light bulb - Power, Incandescent light bulb - Voltage light output and lifetime, Incandescent light bulb - Heat

Read more here: » Incandescent light bulb: Encyclopedia II - Incandescent light bulb - Comparison of electricity cost

A light can waste power by emitting too much light outside of the visible spectrum. Only visible light is useful for illumination, and some wavelengths are perceived as brighter than others. Taking this into account, luminous efficacy is a ratio of the useful power emitted to the total power and is measured in lumens per watt (lm/W). The maximum efficacy possible is 683 lm/W. Luminous efficiency is luminous efficacy divided by this maximum and so is expressed as a number between 0 and 1 or as a percentage[1]. However, the ...

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Incandescent light bulb, Incandescent light bulb - History of the light bulb, Incandescent light bulb - The halogen lamp, Incandescent light bulb - Comparison of electricity cost, Incandescent light bulb - Standard fittings, Incandescent light bulb - Efficacy and efficiency, Incandescent light bulb - Power, Incandescent light bulb - Voltage light output and lifetime, Incandescent light bulb - Heat

Read more here: » Incandescent light bulb: Encyclopedia II - Incandescent light bulb - Efficacy and efficiency

Most domestic and industrial light bulbs have standard fittings compatible with standard lampholders. The most common types of fitting are: E12 or candelabra MES or medium Edison screw (aka E26), used in the USA and Japan for most 120 and 100 volt lamps BC or B22 or double-contact bayonet cap, used in the UK, Ireland and Australia for most 240 volt mains lamps (although MES is also common in the UK) E14 / E27 screw fittings, used in continental Eu ...

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Incandescent light bulb, Incandescent light bulb - History of the light bulb, Incandescent light bulb - The halogen lamp, Incandescent light bulb - Comparison of electricity cost, Incandescent light bulb - Standard fittings, Incandescent light bulb - Efficacy and efficiency, Incandescent light bulb - Power, Incandescent light bulb - Voltage light output and lifetime, Incandescent light bulb - Heat

Read more here: » Incandescent light bulb: Encyclopedia II - Incandescent light bulb - Standard fittings

Most incandescent light bulbs waste about 98% of the power they consume in heat. An incandescent light bulb (about 2.1% efficiency) is about one quarter as efficient as a fluorescent lamp (about 8.2% efficiency), and produces about six times as much heat with the same amounts of light from both sources. One reason why incandescent lamps are unpopular in commercial spaces is because the heat output results in the need for more air conditioning in the summer. Incandescent lamps can usually be replaced by self-ballasted compact fl ...

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Incandescent light bulb, Incandescent light bulb - History of the light bulb, Incandescent light bulb - The halogen lamp, Incandescent light bulb - Comparison of electricity cost, Incandescent light bulb - Standard fittings, Incandescent light bulb - Efficacy and efficiency, Incandescent light bulb - Power, Incandescent light bulb - Voltage light output and lifetime, Incandescent light bulb - Heat

Read more here: » Incandescent light bulb: Encyclopedia II - Incandescent light bulb - Heat

Incandescent lamps are very sensitive to changes in the supply voltage. These characteristics are of great practical and economic importance. For a supply voltage V, Light output is approximately proportional to V3.4 Power consumption is approximately proportional to V1.6 Lifetime is approximately inversely proportional to V16 Color te ...

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Incandescent light bulb, Incandescent light bulb - History of the light bulb, Incandescent light bulb - The halogen lamp, Incandescent light bulb - Comparison of electricity cost, Incandescent light bulb - Standard fittings, Incandescent light bulb - Efficacy and efficiency, Incandescent light bulb - Power, Incandescent light bulb - Voltage light output and lifetime, Incandescent light bulb - Heat

Read more here: » Incandescent light bulb: Encyclopedia II - Incandescent light bulb - Voltage light output and lifetime

Incandescent light bulbs are usually marketed according to the electrical power consumed. This is measured in watts and depends mainly on the resistance of the filament, which in turn depends mainly on the filament's length, thickness and material. It is difficult for the average consumer to predict the light output of a bulb given the power consumed but it can be safely assumed, for two bulbs of the s ...

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Incandescent light bulb, Incandescent light bulb - History of the light bulb, Incandescent light bulb - The halogen lamp, Incandescent light bulb - Comparison of electricity cost, Incandescent light bulb - Standard fittings, Incandescent light bulb - Efficacy and efficiency, Incandescent light bulb - Power, Incandescent light bulb - Voltage light output and lifetime, Incandescent light bulb - Heat

Read more here: » Incandescent light bulb: Encyclopedia II - Incandescent light bulb - Power

Most domestic and industrial light bulbs have standard fittings compatible with standard lampholders. The most common types of fitting are: E12 or candelabra MES or medium Edison screw (aka E26), used in the USA and Japan for most 120 and 100 volt lamps BC or B22 or double-contact bayonet cap, used in the UK, Ireland and Australia for most 240 volt mains lamps (although MES is also common in the UK) E14 / E27 screw fittings, used in continental ...

See also:

Incandescent light bulb, Incandescent light bulb - History of the light bulb, Incandescent light bulb - The halogen lamp, Incandescent light bulb - Comparison of electricity cost, Incandescent light bulb - Standard fittings, Incandescent light bulb - Efficacy and efficiency, Incandescent light bulb - Power, Incandescent light bulb - Voltage light output and lifetime, Incandescent light bulb - Heat

Read more here: » Incandescent light bulb: Encyclopedia II - Incandescent light bulb - Standard fittings

Helium gas. Neon gas. This is the most commonly used of the noble gases. Argon. The second most common after neon. Krypton. Xenon. ...

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Neon sign, Neon sign - History, Neon sign - Manufacturing process, Neon sign - Applications, Neon sign - Images

Read more here: » Neon sign: Encyclopedia II - Neon sign - Images

The neon sign is an evolution of the earlier Geissler tube (also called a Crookes tube), which is a glass tube for demonstrating the principles of electrical discharge. At the 1893 World's Fair, the World Columbian Exposition in Chicago, Illinois, Nikola Tesla's neon lamp signs were displayed. The development of neon signs is credited to Georges Claude and the first public display of a neon sign was of two 38-foot long tubes in December of 1910 at the Paris Expo. The first commercial sign was sold by Jaques Fonseque, Claude’s ...

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Neon sign, Neon sign - History, Neon sign - Manufacturing process, Neon sign - Applications, Neon sign - Images

Read more here: » Neon sign: Encyclopedia II - Neon sign - History

The problem of short bulb life is addressed in the halogen lamp, also called the tungsten-halogen lamp, which is filled with a halogen gas such as iodine or bromine. This creates an equilibrium reaction where evaporated filament is chemically re-deposited at the hot-spots, preventing the early failure of the lamp. This allows halogen lamps to be run at higher temperatures which would cause unacceptably low lamp lifetimes in ordinary light bulbs, ...

See also:

Incandescent light bulb, Incandescent light bulb - History of the light bulb, Incandescent light bulb - The halogen lamp, Incandescent light bulb - Comparison of electricity cost, Incandescent light bulb - Standard fittings, Incandescent light bulb - Efficacy and efficiency, Incandescent light bulb - Power, Incandescent light bulb - Voltage light output and life, Incandescent light bulb - Heat

Read more here: » Incandescent light bulb: Encyclopedia II - Incandescent light bulb - The halogen lamp

Candles are a major cause of damaging fire in households. A former worry regarding the safety of candles was that a lead core is used in the wicks in order to keep the wicks upright in container candles. Without a stiff core, the wicks of container candles would sag and drown in the deep wax pool formed. The fear was that the lead in these wicks would vaporize during the burning process and release lead vapours - a known health and developmental hazard. While this was true at one time, lead-cored wicks have not been in common use sinc ...

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Candle, Candle - Usage, Candle - Religion, Candle - Measurement, Candle - Fuel and candle holders, Candle - Hazards

Read more here: » Candle: Encyclopedia II - Candle - Hazards

Candles can be made of paraffin (a byproduct of petroleum refining), stearin (now produced almost exclusively from palm waxes), beeswax (a byproduct of honey collection), gel (a mixture of resin and mineral oil), some plant waxes (generally palm, carnauba, bayberry, or soy), or tallow (a rarely used byproduct of beef fat rendering). Candles are produced in various colors, shapes, sizes and scents. The most basic production method generally entails the liquification of the solid fuel by the controlled application of heat. This liquid is then ...

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Candle, Candle - Usage, Candle - Religion, Candle - Measurement, Candle - Fuel and candle holders, Candle - Hazards

Read more here: » Candle: Encyclopedia II - Candle - Fuel and candle holders

Most domestic and industrial light bulbs have standard fittings compatible with standard lampholders. The most common types of fitting are: E12 or candelabra MES or medium Edison screw (aka E26), used in the USA and Japan for most 120 and 100 volt lamps BC or B22 or double-contact bayonet cap, used in the UK, Ireland and Australia for most 240 volt mains lamps (although MES is also common in the UK) E14 / E27 screw fittings, used in continental Eu ...

See also:

Incandescent light bulb, Incandescent light bulb - History of the light bulb, Incandescent light bulb - The halogen lamp, Incandescent light bulb - Comparison of electricity cost, Incandescent light bulb - Standard fittings, Incandescent light bulb - Efficacy and efficiency, Incandescent light bulb - Power, Incandescent light bulb - Voltage light output and life, Incandescent light bulb - Heat

Read more here: » Incandescent light bulb: Encyclopedia II - Incandescent light bulb - Standard fittings