# tungsten lamp wavelength range
## Introduction
Tungsten lamps, also known as incandescent lamps, are widely used in various applications due to their high luminous efficacy and affordable cost. These lamps produce light by passing an electric current through a tungsten filament, which heats up and emits visible light. However, the wavelength range of light emitted by tungsten lamps is limited. In this article, we will explore the wavelength range of tungsten lamps and its implications in different industries.
## Visible Light Range
The primary wavelength range emitted by tungsten lamps falls within the visible light spectrum. Visible light ranges from approximately 400 to 700 nanometers (nm). Tungsten lamps emit light within this range, producing a warm white light that is commonly used in residential lighting, such as table lamps and ceiling fixtures. The color temperature of tungsten lamps usually ranges from 2700 to 3000 Kelvin, giving a soft and cozy ambiance to the surroundings.
## Infrared Range
Apart from visible light, tungsten lamps also emit a significant amount of infrared (IR) radiation. Infrared radiation has longer wavelengths than visible light and is invisible to the human eye. The IR range emitted by tungsten lamps extends from approximately 700 nm to 1 millimeter (mm). This range of IR radiation is utilized in various applications, including heating, drying, and cooking. Tungsten lamps are commonly found in infrared heaters, where the emitted IR radiation directly warms objects without heating the surrounding air.
## Ultraviolet Range
On the other end of the spectrum, tungsten lamps also emit a small amount of ultraviolet (UV) radiation. UV radiation has shorter wavelengths than visible light and is also invisible to the human eye. The UV range emitted by tungsten lamps spans from approximately 10 to 400 nm. While the UV emission from tungsten lamps is minimal, it can still have certain effects. UV radiation can cause fading and degradation of materials, such as fabrics and artworks. Therefore, it is important to consider UV filters or use alternative lighting sources in applications where UV radiation can be detrimental.
## Applications
The wavelength range of tungsten lamps is crucial in determining their applications. The visible light range emitted by tungsten lamps makes them suitable for general lighting purposes in homes, offices, and hospitality establishments. The warm white light creates a comfortable environment in these settings. The IR radiation emitted by tungsten lamps is utilized in industrial processes, such as drying paints and coatings, as well as in medical treatments, like physiotherapy. However, the UV radiation emitted by tungsten lamps limits their use in certain contexts, such as museums and art galleries where UV-sensitive artifacts are displayed.
## Conclusion
Tungsten lamps have a wavelength range that primarily covers visible light, but they also emit infrared and ultraviolet radiation. The visible light range makes them ideal for general lighting applications. The emitted infrared radiation allows for heating and drying processes, while the small amount of UV radiation can pose limitations in certain contexts. Understanding the wavelength range of tungsten lamps is essential for selecting the appropriate lighting source for various industries and optimizing their use in different settings.
