Long Way Education

By Eman Abdallah Kamel

In this article, you will learn about the history of light bulbs, their types, modern lighting types, the dangers of light pollution, and some tips.

The Electric Lamp

Electricity is the flow of electrical energy. It is a fundamental part of nature and one of the most important forms of energy. According to the Cambridge Dictionary, electricity is a type of energy that can be generated in many different ways and is used to power equipment that creates light, heat, and other types of energy.

An electric lamp is a device that converts electricity into light. These lamps usually have a base made of ceramic, metal, glass, or plastic, which secures the lamp into a standard socket, which may be made of a screw-on base, two metal pins, or two metal caps. Lighting is important in our lives. However, excessive use of lighting harms the environment.

Several organizations are working to reduce light pollution, such as the US-based International Dark-Sky Association (IDA), founded in 1988 to preserve the natural night sky.

Let’s explore more about electric lighting.

Who invented the light bulb?

In 1878, the American scientist Thomas Edison began serious research into developing an incandescent lamp. In 1878, Edison filed his first patent application for an “improvement in electric lighting”. In 1879, he filed another U.S. patent for an electric lamp using “a carbon filament, or ribbon, wound and connected to platinum contact wires”. In 1880, the Edison Electric Light Company began marketing its new product.

History

The electric lamp has gone through many developments until it reached its current form, including the following:

• Early Attempts at Electric Lighting,
• Thomas Edison and the Incandescent Bulb,
• Competitors and Innovations,
• Fluorescent and Halogen Lamps,
• From the 1970s to the Present.

1. Early Attempts at Electric Lighting

The quest to create a reliable electric light began long before the invention of the incandescent bulb. As early as the 19th century, scientists experimented with different methods to produce artificial light using electricity. In 1802, English scientist Humphry Davy created the first electric arc lamp by connecting two wires to a battery and attaching a piece of carbon between the ends. While this arc lamp was far too bright and unstable for practical use, it laid the groundwork for future innovations in electric lighting.

Another significant breakthrough came in 1841 when British inventor Frederick de Moleyns patented an early form of an incandescent light bulb. However, the technology at the time was not advanced enough to sustain long-term, reliable use. His invention lacked the necessary longevity, and it wasn’t until several decades later that the first practical electric lamp was born.

2. Thomas Edison and the Filament Bulb

In 1879, Thomas Edison was widely credited with inventing the first usable incandescent light bulb. Edison’s key innovation was the development of a carbon filament that could burn brightly for long periods without burning out quickly.

In addition to improving the filament, Edison also created a complete electrical system that could deliver power to the bulbs. This system included generators, wiring, and other infrastructure, making electric lighting more practical and accessible. By 1882, Edison’s company had built the first electric power station in New York City, which distributed electricity to homes and businesses, heralding the widespread adoption of electric lighting.

3. Competitors and Innovations

Though Edison is widely recognized for his work on the incandescent bulb, he was not the only one working in this field. Around the same time, Joseph Swan, a British physicist and chemist, developed a similar light bulb using a carbonized paper filament. Swan’s design was patented in the UK in 1878, just before Edison’s famous light bulb demonstration in 1879. This led to a legal dispute between the two inventors, which eventually resulted in them forming a joint company called Edison & Swan United Electric Light Company.

Also, Nikola Tesla, a contemporary of Edison, worked on alternating current (AC) technology, which would eventually become the standard for electrical distribution. Tesla’s work was pivotal in the development of more efficient and widespread electrical systems, which in turn made electric lamps more accessible to the public.

4. Fluorescent and Halogen Lamps

New types of lightbulbs were introduced in the 20th century. In the 1930s, fluorescent lighting debuted on the market, offering an energy-efficient option to incandescent bulbs. A fluorescent lamp is a low-pressure mercury-vapor gas discharge lamp that uses fluorescence to produce visible light. An electric current in the gas excites mercury vapor and produces short-wavelength ultraviolet light that causes a phosphor layer inside the lamp to glow.

Halogen lamps were developed in the 1950s. These lamps use tungsten filaments similar to incandescent lamps but operate at higher temperatures and use halogen gas for increased efficiency and service life. Halogen lamps provide a brighter, whiter light and have been used in residential and commercial settings.

5. From the 1970s to the Present

In 1973, there were energy shortages and the oil crisis, so lighting engineers developed a fluorescent lamp that could be used in residential applications. In 1974, researchers at Sylvania began investigating how to miniaturize the ballast and fit it into the lamp. By 1976, Edward Hammer at General Electric had discovered how to bend a fluorescent tube into a spiral shape, resulting in the first compact fluorescent lamp. However, GE abandoned this design due to high costs.

Compact fluorescent lamps (CFLs) first appeared in the mid-1980s. Many CFLs in the 1990s were large, heavy, and produced low light output. The improvements in CFL performance, price, efficiency, and lifespan (which last about 10 times longer) made them a viable option.

Light-emitting diodes (LEDs) are one of the fastest-growing lighting technologies today.

Types of Lamps

The light sources can be arranged in the following groups based on the principle of operation:

1. High-Temperature Lamps,
2. Arc Lamps,
3. Gaseous Discharge Lamps,
4. Fluorescent Lamps.

1. High-Temperature Lamps: This type includes oil lamps, gas lamps, and filament incandescent lamps, which emit gases when heated to high temperatures. Filament lamps, such as halogen lamps and cold lamps.

2. Arc Lamps: In this type, an electrical discharge through the air provides intense light. Arc lamps include carbon arc lamps, flame arc lamps, and magnetic arc lamps.

3. Gaseous discharge lamps: Under specific circumstances, visible light can be produced when an electric current passes through a gas or metal vapor. These types include sodium vapor discharge lamps, high-pressure mercury vapor discharge lamps, neon lamps, and neon tube lamps.

4. Fluorescent Lamps: When exposed to ultraviolet light, they convert the absorbed energy into longer-wavelength radiation that falls within the visible range. Fluorescent lamps include mercury iodide lamps, neon lamps, neon tube lamps, and fluorescent tubes.

Modern Electric Lamps

Modern electric lamps include the following:

1. LED Lamps,
2. CFL Lamps,
3. Smart Lighting.

1. LED Technology

LEDs use less energy, last longer, and require less power than incandescent or fluorescent bulbs. They work by passing a current through light-producing semiconductors. Unlike incandescent bulbs, which lose a lot of energy as heat, LEDs are cool to the touch and emit light directly from most of their energy.

Did You Know?

By switching to LED lighting from incandescent, you can save up to 75% on electricity and lessen your environmental impact.

Although LED technology was initially developed in the 1960s, general lighting applications did not begin to use it until the early 2000s. These days, LEDs are employed in a multitude of applications, ranging from smart home lighting systems to vehicle headlights and street lighting.

2. Compact Fluorescent Lamps (CFLs)

CFLs are a smaller version of the traditional fluorescent tube and can be used in standard light sockets. They use about 70-80% less energy than incandescent bulbs and have a longer lifespan.

However, CFLs have some drawbacks, including the presence of small amounts of mercury, which can be dangerous if the bulb breaks. Additionally, they take a few moments to reach their full brightness and may not be as durable as LEDs in some applications. As a result, LED technology has largely eclipsed CFLs in recent years.

3. Smart Lighting Systems

Customers can remotely control their home lights with smart lighting systems by using smartphone apps or voice assistants like Amazon Alexa. LED technology is frequently used in these systems; it can be programmed to change color and brightness or even to turn on and off at specific times.

Smart lighting offers increased energy efficiency. By integrating with home automation systems, smart lighting allows customers to create customized lighting schemes and easily control their home environment.

Risks of Lighting Pollution

Excessive lighting leads to several dangers, including:

1. Sky glow: It is the brightness of the night sky, especially over urban areas, caused by electric lights from cars, street lamps, offices, factories, outdoor advertising, and buildings. Astronomers are particularly concerned about skyglow pollution because it reduces their ability to see celestial objects.
2. Health risks: Increased light at night reduces the production of the hormone melatonin (the brain produces it when it’s dark), leading to sleep deprivation, fatigue, headaches, stress, anxiety, and other health problems. Also, recent studies have shown a link between low melatonin levels and cancer.
3. Furthermore, studies indicate that light pollution negatively affects animal migration, sleep-wake cycles, and habitat formation.

Did You Know?

Studies have shown that blue light, in particular, reduces melatonin levels. Blue light is found in cell phones, computers, and light-emitting diodes (LEDs), which become popular because of their low cost and energy efficiency.

Solution

• Lighting is important in our daily lives, but we must try not to overuse it to maintain our health, save money, and protect the environment from light pollution.

• Reducing lighting consumption allows you to enjoy the beauty of the night sky, go to bed early, and wake up early to perform your daily tasks effectively.

Sources

• Energy.Gov
• The History of the Light Bulb… pdf
• Types of Lamps… pdf
• Melatonin: What You Need To Know
• Light Pollution

©Eman Abdallah Kamel, 2024

About the author: Eman is a writer and engineer. She likes writing about inventions and their development.

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