Umair Gaines
Electric lighting is a light powered by electricity. Before the widespread adoption of electric lighting, people used candles, gas lights, oil lamps, and fires to illuminate their homes. The development of the incandescent light bulb in the 19th century marked a significant improvement in energy efficiency, and today, modern electric light sources come in various types and sizes, adapted for multiple applications. Electric lighting has revolutionized the way we light our homes, communities, and cities, making it possible to control lighting remotely and even through AI voice commands.
| Characteristics | Values |
|---|---|
| Definition | A light or lamp powered by electricity |
| Types | Incandescent lamps, gas-discharge lamps, LED lamps, CFLs |
| Power Sources | Centrally generated electric power, mobile or standby electric generators, battery systems |
| Energy Efficiency | LED lights are up to 90% more efficient than incandescent bulbs |
| Color | Common LED colors include amber, red, green, and blue. White light is produced by combining different color LEDs or using a phosphor coating |
| Directionality | LEDs are "directional" light sources, emitting light in a specific direction |
| Illumination | Electric lighting can be tailored to different purposes, from a cozy ambiance in homes to bright, focused lighting in offices |
| Color Rendering | The color rendering of a light source is expressed as a rating from 0-100 on the Color Rendering Index (CRI) |
| Industrial Lighting | Sufficient lighting in factories, typically around 200 lux, increases production, quality of work, and reduces accidents |
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What You'll Learn
History of electric lighting
The history of electric lighting is a long and fascinating one, spanning centuries and involving numerous international contributors. The progression of electric lighting technology from arc lamps to LEDs is a remarkable journey.
The earliest forms of artificial lighting were fire, candles, and oil lamps. Lightning, which is a natural electrical phenomenon, may have been the first source of light that early humans could keep using as needed. They likely discovered static electricity by accident, perhaps by rubbing amber against other materials and producing a spark.
In the 18th century, electricity was discovered, and the first electric battery, the voltaic pile, was created by Alessandro Volta in 1799–1800. The English chemist Humphry Davy gave a practical demonstration of an arc lamp in 1806, but it was not a viable option for lighting due to its blinding brightness and short duration. The first persistent electric arc was created by Russian physicist Vasily Vladimirovich Petrov in 1802, and it served as the basis for the creation of the arc lamp. Arc lamps were a significant improvement over candles, and in 1846, the Opera Theatre in Paris became the first public building to be equipped with electric arc lamps.
The late 19th century saw intense competition and innovation in the field of electric lighting. Inventors like Joseph Swan in the UK and Thomas Edison in the US independently developed functional incandescent lamps. Swan's bulbs were successful but had thick filaments, while Edison's bulbs used thinner filaments, resulting in a superior design. Edison is often credited with inventing the light bulb, but it was Swan who developed the first practical lamp and led the way in early electric lighting. Edison, however, successfully registered patents and brought electric lighting to the market. The rivalry between Swan and Edison eventually led to a merger, forming the Edison and Swan Electric Light Company, which created more affordable and long-lasting bulbs.
The turn of the century brought further improvements in bulb efficiency and longevity, with the introduction of the tungsten filament by William D. Coolidge in 1912. The first neon light was introduced by Georges Claude in 1910, paving the way for neon signs in advertising. After World War I, electricity began to find its way into homes on a larger scale, and the establishment of the national grid through the Electricity (Supply) Act in 1926 ensured clean and safe lighting for all.
In 1934, Arthur Compton reported successful experiments with fluorescent lighting, and a prototype fluorescent lamp was built at General Electric's Nela Park engineering laboratory. The first practical LED arrived in 1962, marking another significant milestone in the history of electric lighting.
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How electric lighting works
Electric lighting is the most common form of artificial lighting. It is produced when light bulbs, lamps, or other electric devices convert electricity into light. The first electric battery was created by Alessandro Volta in 1799–1800, and the first electric arc was developed by Vasily Vladimirovich Petrov in 1802. However, it wasn't until the late 19th century that inventors like Joseph Swan and Thomas Edison created the first functional incandescent light bulbs.
For a light bulb to work, it must be connected to an electrical circuit. The bulb's metal contacts connect to the ends of the circuit, which is powered by a centrally generated electric power source or, in some cases, mobile or standby electric generators or battery systems. The circuit is completed when a connection is made between the light bulb and the wires, allowing the wires to transmit an electric current to the bulb.
The bulb's thin metal filament then heats up as the current passes through it, producing light. This process is called incandescence. The filament is typically made of tungsten, which has a high resistance and can reach temperatures of around 4,000°F (2,200°C). The heat causes the electrons in the filament's atoms to vibrate and move to higher energy levels. As these electrons fall back to their normal levels, they release energy in the form of photons, which are particles of light.
There are several other types of electric lighting beyond incandescent bulbs, including fluorescent, high-intensity discharge, and light-emitting diode (LED) lamps. Fluorescent lamps use a glass tube filled with mercury vapour or argon gas under low pressure. When electricity flows through the tube, it causes the gases to emit ultraviolet energy. The inside of the tube is coated with phosphors, which give off visible light when struck by ultraviolet photons. LEDs are semiconductor devices that emit light when charged with an electric current. The current causes electrons inside the LED to combine with positive charges, releasing energy as light when the electrons return to their ground state.
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Electric lighting in the home
Electric lighting has come a long way since the first demonstrations of arc lamps and incandescent light bulbs in the 19th century. Today, electric lighting in the home is a given for most people, but it's important to remember that this convenience is a relatively recent development. Before the advent of electric lighting, people relied on candles, gas lights, oil lamps, and fires to illuminate their homes. The introduction of electric lighting revolutionized the way we live, allowing for greater flexibility and productivity in our daily routines.
The history of electric lighting is a fascinating journey of innovation and improvement. The early arc lamps, despite requiring frequent manual adjustments, offered a significant upgrade from candles. In 1846, the Opera Theatre in Paris became the first public building to adopt electric arc lamps, marking a pivotal moment in the transition to electric lighting. Charles F. Brush further advanced this technology in 1877 with his design for an automatically regulated arc lamp, which played a crucial role in the widespread adoption of electric lighting.
One of the key pioneers in the history of electric lighting is Thomas Edison. While he was not the sole inventor of the incandescent light bulb, his practical design and efforts to distribute electricity from centralized power generation stations made electric lighting accessible to the average person. Edison's lamp, featuring a carbonized bamboo fiber filament, offered superior efficiency, high resistance, and the ability to operate at a low current, allowing for multiple lamps to be wired in parallel. This led to a decline in prices and spurred innovation in lighting technologies.
Today, modern electric lighting comes in various types and sizes, catering to different applications and user needs. Incandescent light bulbs, despite being phased out in many countries due to low energy efficiency, continue to be a common lighting option. They consist of a coiled tungsten filament sealed in a glass chamber, emitting light when heated by an electric current. However, only 2-5% of the energy consumed is converted into visible light, with the rest lost as heat.
More energy-efficient alternatives, such as compact fluorescent lamps (CFLs) and light-emitting diodes (LEDs), are gaining popularity. CFLs, though more expensive initially, offer significant energy savings over time and are available in sizes compatible with incandescent lamps. LEDs, known for their long life and high efficacy, have been widely used as indicator lights and are increasingly favoured for general lighting purposes due to their low energy consumption.
In conclusion, electric lighting in the home has transformed the way we live, providing convenient, flexible, and efficient illumination. While we continue to innovate and explore new lighting technologies, it's important to acknowledge the pioneers who laid the foundation for this essential aspect of our daily lives.
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Types of electric lighting
Electric lighting is the artificial illumination produced by electrical sources. It has significantly improved in energy efficiency since the first demonstrations of arc lamps and incandescent light bulbs in the 19th century. Before electric lighting became common in the early 20th century, candles, gas lights, oil lamps, and fires were used.
Today, there are several types of electric lighting, including:
Incandescent Light Bulbs
Incandescent light bulbs consist of a coiled filament of tungsten sealed in a globular glass chamber, either a vacuum or full of an inert gas such as argon. When an electric current is connected, the tungsten is heated to a high temperature, emitting light. Incandescent bulbs are highly inefficient, with just 2-5% of the energy consumed emitted as visible light. The remaining 95% is lost as heat. They are being phased out in favour of more efficient technologies.
Fluorescent Lamps
Fluorescent lamps consist of a glass tube containing mercury vapour or argon under low pressure. Electricity flowing through the tube causes the gases to give off ultraviolet energy, which is converted into light. Fluorescent lamps are more efficient than incandescent bulbs and have a longer lifespan. They are commonly used in office and industrial settings.
Light-Emitting Diodes (LEDs)
LEDs have been used as indicator lights in consumer electronics since the 1970s. They are more energy-efficient than incandescent bulbs and are becoming increasingly popular for general lighting purposes.
High-Intensity Discharge (HID) Lights
HID lights produce a much brighter, whiter light compared to traditional incandescent bulbs. They are commonly used in commercial and industrial settings and offer advantages such as energy efficiency and a long lifespan.
Metal Halide Lights
Metal halide lights use a bulb filled with a mix of gases and metals. When electrically charged, they produce a bright white light with a high level of illumination. These lights are commonly used in industrial settings and are cost-effective due to their long lifespan.
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Electric lighting efficiency
Electric lighting refers to the use of electric lamps and light fixtures to provide illumination. The development of electric lighting began in the 19th century with the invention of the voltaic pile, the first electric battery, by Alessandro Volta in 1799-1800. This was followed by the creation of arc lamps and incandescent light bulbs, which were significant improvements over traditional light sources such as candles, gas lights, and oil lamps.
Since then, electric lighting efficiency has significantly improved, and modern electric light sources come in various types and sizes adapted to different applications. One of the key indicators of lighting efficiency is luminous efficacy, measured in lumens per watt. Luminous efficacy indicates how much light is emitted for each unit of energy consumed, with higher values representing greater efficiency.
Incandescent light bulbs, the traditional type of light bulbs, are highly inefficient. They release 90% of their energy as heat, and only 2-5% of the energy consumed is emitted as visible, usable light. This not only wastes energy but also puts additional pressure on ventilation or air conditioning systems to remove the excess heat, especially in warmer climates. As a result, incandescent bulbs are being phased out in favour of more efficient lighting technologies.
Fluorescent lighting systems, for example, have a higher luminous efficacy than incandescent bulbs, typically ranging from 50 to 100 lumens per watt. While fluorescent lamps have higher initial costs due to the need for a ballast, their lower energy consumption can offset this over time. However, fluorescent lamps contain mercury, which classifies them as hazardous waste and requires proper recycling or disposal.
Light-emitting diodes (LEDs) are today's most energy-efficient and rapidly developing lighting technology. LEDs emit light in a specific direction, reducing the need for reflectors and diffusers that can trap light, making them more efficient for many applications. They also generate little heat, last significantly longer than incandescent bulbs, and convert more of their electrical energy into light. LEDs are estimated to use at least 75% less energy and last up to 25 times longer than incandescent lights.
The widespread adoption of LED lighting has the potential to significantly reduce energy consumption and costs. Analysts project that by 2030, LED lighting will account for 74% of lumen-hour sales in the United States, contributing to a decline in residential energy use for lighting by more than 50%. International initiatives and organisations such as the IEA's Energy-Efficient End-use Equipment (4E) programme are also working to support governments in developing effective lighting policies and improving lighting efficiency worldwide.
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Frequently asked questions
Electric lighting is a light powered by electricity. Before the widespread adoption of electric lighting, people used candles, gas lights, oil lamps, and fires to light their homes.
There are several types of electric lighting technologies, including incandescent, fluorescent, high-intensity discharge, and light-emitting diode (LED) lighting. In modern incandescent light bulbs, an electric current is connected to a coiled filament of tungsten sealed in a glass chamber, heating the tungsten to emit light.
Electric lighting is more convenient and safer than traditional lighting methods such as candles and oil lamps, which can pose fire hazards. Electric lighting is also more energy-efficient than traditional lighting methods, with modern electric light sources coming in a variety of types and sizes adapted to many applications.
