Molly Ayala
The electric light bulb is an electrical device that produces light from electricity. It is the most common form of artificial lighting. The development of the light bulb can be traced back to the 19th century, with key contributions from scientists and inventors such as Sir Humphry Davy, James Bowman Lindsay, Thomas Edison, and Heinrich Geissler. Over time, the design of the light bulb has evolved from early incandescent bulbs to more modern fluorescent and LED lamps, with improvements in energy efficiency and lighting quality. The history of the light bulb showcases the continuous innovation and advancements in lighting technology, shaping the way we illuminate our world today.
| Characteristics | Values |
|---|---|
| Definition | An electrical device that produces light from electricity |
| Base | Ceramic, metal, glass, or plastic |
| Electrical connection to the socket | Screw-thread base, two metal pins, two metal caps, or a bayonet mount |
| Categories | Incandescent lamps, gas-discharge lamps, and LED lamps |
| Incandescent lamps | Produce light by a filament heated white-hot by an electric current |
| Gas-discharge lamps | Produce light by an electric arc through a gas, such as fluorescent lamps |
| LED lamps | Produce light by a flow of electrons across a band gap in a semiconductor |
| History | The first electric light was created in 1802 by Sir Humphry Davy, an English physician |
| First practical use | In 1879, Thomas Edison made an incandescent bulb that burned long enough to light a home for many hours |
| First neon light | In 1910, Georges Claude introduced the first neon light, which paved the way for neon signs in advertising |
| First compact fluorescent light (CFL) | In the mid-1980s, the first CFLs were introduced to the market at a retail price of $25-35 |
| Latest development | As of August 1, 2023, incandescent light bulbs, including halogen bulbs, stopped being sold in the United States due to low performance metrics |
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What You'll Learn
The first electric light
In the early 1900s, Peter Cooper Hewitt created a blue-green light by passing an electric current through mercury vapour, becoming a precursor to the fluorescent lamp. Hewitt's lamps were more efficient than incandescent bulbs but had limited use due to their light colour. In 1910, Georges Claude introduced the first neon light, leading to the ubiquitous neon signs in advertising. In 1913, Irving Langmuir discovered that placing an inert gas like nitrogen inside the bulb doubled its efficiency, and scientists continued making improvements over the following decades.
In 1934, Arthur Compton reported successful experiments with fluorescent lighting, leading to the creation of a prototype fluorescent lamp by a team led by George E. Inman at General Electric's Nela Park engineering laboratory in Ohio. By the 1950s, researchers had only figured out how to convert about 10% of the energy used by incandescent bulbs into light, prompting a shift in focus to other lighting solutions. In the mid-1980s, early compact fluorescent lights (CFLs) entered the market, but they faced challenges due to their high price, bulkiness, and inconsistent performance.
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The incandescent light bulb
Over time, improvements were made to the incandescent light bulb, such as the use of tungsten filaments, which increased the bulb's brightness and longevity. In 1913, Irving Langmuir discovered that filling the bulb with an inert gas like nitrogen doubled its efficiency. Despite these improvements, incandescent bulbs are highly inefficient, with only about 2-5% of the energy consumed converted into visible light. This has led some governments to phase out incandescent bulbs in favour of more energy-efficient alternatives, such as fluorescent and LED bulbs.
Incandescent bulbs have had a significant impact on society, changing the way buildings are designed, increasing the length of the average workday, and jumpstarting new businesses. They also led to advancements in power plants, electric transmission lines, home appliances, and electric motors. Today, incandescent bulbs are still used in various applications, such as household and commercial lighting, portable lighting, and decorative lighting. However, they are now being replaced by more energy-efficient alternatives.
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Fluorescent lighting
The history of fluorescent lighting can be traced back to the 19th century when Heinrich Geissler and Julius Plücker, two Germans, discovered that they could produce light by removing almost all of the air from a long glass tube and passing an electrical current through it. This invention became known as the Geissler tube, a type of discharge lamp. However, it was Peter Cooper Hewitt's breakthrough in the early 1900s that became a precursor to the fluorescent lamp. Hewitt created a blue-green light by passing an electric current through mercury vapour and incorporating a ballast, a device that regulates the flow of current through the tube.
In the late 1920s and early 1930s, European researchers experimented with neon tubes coated with phosphors, a material that converts invisible ultraviolet light into useful white light. These findings sparked fluorescent lamp research programs in the United States, and by the mid-to-late 1930s, American lighting companies were demonstrating fluorescent lights. In 1934, Arthur Compton, a renowned physicist and GE consultant, reported successful experiments with fluorescent lighting at General Electric Co., Ltd. in Great Britain. This led to the development of a prototype fluorescent lamp by a team led by George E. Inman at General Electric's Nela Park (Ohio) engineering laboratory.
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LED lamps
The electric light bulb is an electrical device that produces light from electricity. The three main categories of electric lights are incandescent lamps, gas-discharge lamps, and LED lamps. LED lamps, or light-emitting diodes, produce light by a flow of electrons across a band gap in a semiconductor. LED lamps are known for their energy efficiency, long lifespan, and low heat output. They are available in a variety of shapes, sizes, and colour temperatures to suit different applications and user preferences.
LED table lamps, for example, are designed with both style and functionality in mind. They come in a variety of designs, from minimalist marble to brushed brass, adding aesthetic value to any space. These lamps often feature USB ports and wireless charging capabilities, making them versatile and convenient for modern users.
Overall, LED lamps have revolutionised lighting by offering energy efficiency, longevity, and versatility. They have become a popular choice for both functional illumination and decorative lighting, contributing to the advancement of lighting technology beyond the traditional electric light bulb.
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The future of lighting
The electric light bulb is an electrical device that produces light from electricity. Since the first electric light demonstrations in the 19th century, lighting technology has evolved significantly. However, there is still room for future advancements in efficiency, versatility, and sustainability.
Smart Lighting and Human-Centric Lighting
Smart lighting systems are expected to become more prevalent in the future. These systems connect smart bulbs and switches with sensors, allowing remote control via smartphones, voice commands, and apps. They can provide energy savings, convenience, and enhanced security. Human-centric lighting (HCL) is a design approach that considers the impact of light on human biology and behaviour, aiming to promote health and well-being by mimicking the body's natural cycle and varying light intensity throughout the day.
Light-Emitting Diodes (LEDs)
LEDs have been a reliable light source since their introduction in the 1960s, known for their energy efficiency and longevity. In the future, LEDs are expected to become even more versatile, allowing users to customize them for specific functions and designs.
Organic Light-Emitting Diodes (OLEDs)
OLED technology, used in some TV models, emits light from a thin, flexible film, enabling more creative designs and energy efficiency. OLEDs are expected to become an alternative to traditional LEDs, offering new possibilities for lighting design.
Biophilic Lighting
Biophilic lighting practices involve integrating lights with vertical gardens or using fixtures that mimic natural sunlight, varying in colour and intensity to simulate the natural cycle of light. These practices offer health and well-being benefits and improve the aesthetics of interior spaces, bringing a touch of nature into urban environments.
Laser Diode Lighting
Laser diode lighting, founded by Nobel Prize winner Dr. Shuji Nakamura, has an efficiency ten times higher than LED light bulbs. It is already used in the automotive industry, and its integration into car headlights by manufacturers like Audi and BMW is an example of its growing presence. Laser diode lighting is expected to become commonplace in homes and workplaces, delivered through fine fibre optic cables with innovative applications, such as glowing fabrics.
'Li-Fi' (Light Fidelity)
'Li-Fi' is a technology that enables lamps to transmit wireless data signals through visible light beams, potentially turning home lighting into an internet router. The technology has been developed by French manufacturer Lucibel and Scottish startup pureLifi, offering speeds of up to 45 megabits per second.
Natural Light from Organisms
Research is exploring ways to harness the light naturally produced by organisms such as fireflies, bacteria, fungi, and sea creatures as part of their metabolic processes. This technology, while still experimental, has the potential to revolutionize home lighting as it releases no carbon or heat, making it safe and energy-efficient.
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Frequently asked questions
While Thomas Edison improved the design and performance of the earliest incandescent lamps to create the first commercially viable light bulb, he did not invent the first light bulb. In 1835, James Bowman Lindsay demonstrated a constant electric light at a public meeting in Dundee, Scotland. However, he did not develop the electric light any further. In 1838, Belgian lithographer Marcellin Jobard invented an incandescent light bulb with a vacuum atmosphere using a carbon filament.
In 1878, Joseph Swan developed a method of processing that avoided early bulb blackening. This received a British patent in 1880. On December 18, 1878, a lamp using a slender carbon rod was shown at a meeting of the Newcastle Chemical Society. The lamps demonstrated by Swan used a carbon rod from an arc lamp rather than a slender filament. In 1879, Thomas Edison invented an incandescent bulb that burned long enough to be practical, lighting a home for many hours.
The three main categories of electric lights are incandescent lamps, gas-discharge lamps, and LED lamps. Incandescent lamps, such as halogen bulbs, produce light by heating a filament to white-hot temperatures with an electric current. Gas-discharge lamps, such as fluorescent lamps, produce light by passing an electric current through a gas. LED lamps, such as solid-state lighting, use semiconductors to convert electricity into visible light.
