[PDF] Luminous flux of different types of light sources | Illumination | New Topic [2023]

In this note, we are discussing about the amount of Luminous Flux of Different Types of Light Sources. Welcome to Poly Notes Hub, a leading destination for Diploma Engineering Notes.

Author Name: Arun Paul.

Different Types of Light Sources

There are different types of light sources like –

1. Candle: A candle is an object that is usually constructed of wax and has an inserted wick that, when ignited, burns the wax to provide light. Candles are frequently used for rituals, ornamentation, and lighting. They have been used for both utilitarian and symbolic purposes for millennia, and they are available in a variety of sizes, forms, and smells.
2. Kerosene Lamp: A kerosene lamp is a kind of lamp that gets its light from kerosene, a liquid fuel that burns easily. Usually, these lamps are made comprised of a burner to create the flame, a wick to suck up the fuel, and a tank to store the kerosene. Kerosene burns and vaporizes when the flame is lit, illuminating the area. Before electricity became widely available, kerosene lamps were widely used. They are still in use in some places of the world where electricity is either scarce or nonexistent.
3. LPG Lamp: An LPG lamp is a type of lighting source that runs on liquefied petroleum gas (LPG). Usually, these lamps are made up of a burner assembly, a mantle, and a container or cylinder that contains the pressurized LPG. The mantle heats up when the gas is released and ignited, providing light as it burns brightly. When electricity is unavailable or as a backup lighting source in rural or outdoor locations, LPG lamps are frequently utilized. They offer a lightweight and practical source of lighting.
4. Incandescent Lamp: A filament wire is heated to a high temperature till it emits visible light, producing light in an incandescent lamp, also referred to as an incandescent light bulb. To keep the filament from oxidizing, it is housed inside a glass bulb that is filled with inert gas. Light is released as energy passes through the filament, heating it and making it glow. When it comes to indoor lighting, incandescent lamps were previously very popular, but their low energy efficiency in comparison to other lighting technologies like LED and CFL bulbs has caused them to become less common.
5. Halogen Lamp: An incandescent light bulb that uses a small quantity of halogen gas (such as iodine or bromine) inside it to increase efficiency and longevity is called a halogen lamp. Like conventional incandescent bulbs, the bulb has a tungsten filament, but the halogen gas enables the filament to function at greater temperatures without degrading as rapidly. The filament emits light when it heats up. By redistributing tungsten that has evaporated onto the filament, the halogen cycle prolongs the filament’s life and aids in regeneration. Halogen lamps emit a bright, white light that is frequently utilized for work lights, automotive headlights, interior and outdoor lighting, and other purposes. Their excellent brightness and color rendering are well renowned.
6. Fluorescent Lamp: An electric current is passed through a tube containing low-pressure mercury vapor and a phosphor coating on the inside surface of the tube to produce light in a fluorescent lamp, a form of a gas-discharge lamp. UV light is produced by the mercury atoms inside the tube when they are stimulated by the electrical current. When the phosphor coating is exposed to this UV light, it fluoresces or releases visible light. Due to its energy economy, fluorescent lights are frequently used for general lighting in a variety of locations, including workplaces, homes, and commercial buildings. They are available in several sizes and shapes, such as the tube-shaped ones that are frequently seen in ceiling fixtures and the smaller ones called compact fluorescent lights (CFLs). However, LED technology has become increasingly popular due to its even higher energy efficiency and longer lifespan compared to traditional fluorescent lamps.
7. CFL Lamp: An energy-efficient lightbulb is a compact fluorescent lamp or CFL for short. It comes with multiple benefits and is meant to take the place of conventional incandescent bulbs. UV light is produced by CFL lamps by stimulating mercury vapor with an electric current. Visible light is then produced by the interaction of this light with a phosphor coating within the lightbulb.
8. LED Lamp: An LED lamp, also known as a light-emitting diode lamp, is a type of lighting that emits light by use of light-emitting diodes (LEDs). LEDs are semiconductors that, when an electric current flows through them, produce light. When compared to conventional incandescent, fluorescent, or halogen lamps, LED bulbs are incredibly long-lasting, robust, and energy-efficient.

Luminous flux of different types of light sources

In this table, we are display the amount of Luminous Flux of different types of light sources –