UV light

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The spectrum is divided into regions by wavelength, energy, and frequency. The common designations are radio waves, microwaves, infrared (IR), visible light, ultraviolet (UV), X-rays and gamma-rays. UV light falls in between visible light and X-rays of the EM spectrum range. The most common form of UV radiation is sunlight, which produces three main types of UV rays: UVA, or near UV (315–400 nm); UVB, or middle UV (280–315 nm); UVC, or far UV (180–280 nm). UVA rays have long wavelength that penetrates the middle layer of your skin.

When discussing white light and its colours, it is essential to differentiate between electric LED light and sunlight. While electric white LED light contains all the visible colours from blue to red, sunlight emits not only all visible colours but also some "colours" or wavelengths that humans cannot see. The sun also emits ultraviolet and infrared radiation, invisible to the naked eye. We can, however, observe the effects of ultraviolet waves on our skin, turning it brown or red, just as we can feel the warmth from infrared radiation when basking in the sun.

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NF Mott · 1938 · 347 — When a quantum of radiation is absorbed in the region of true continuous absorption, a free electron in the conduction band and a "positive hole" are formed ...

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Near UVregion

Light waves are the result of vibrations of electric and magnetic fields, and are thus a form of electromagnetic (EM) radiation. Visible light is just one of ...

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VacuumUVregion

UVB rays have a shorter wavelength that reaches the outer layer of your skin, which cause suntan or sunburn. These are the reaction to exposure of UVB rays. UVC radiation from the sun is blocked by the ozone layer in the atmosphere. The only way to access UVC radiation is from an artificial source like a lamp or laser. UVC light is commonly used for disinfection and sterilization purposes.

UV or UVC lamps are often called “germicidal” lamps. UV fluorescent lamps can be used for air, water and surface disinfection. Germicidal UVC bulb is commonly installed inside air ducts to disinfect the air. This is the safest way to avoid direct exposure to human skin or eyes which may cause injuries. The most common type of UV lamp that produce UVC radiation is the low-pressure mercury lamp. UVC-low pressure fluorescent lamps emit UV radiation mostly in the range of 254 and 185 nm.

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coherent light source. A light source that is capable of producing radiation with waves vibrating in phase. The laser is an example of a coherent light source.

Near UVand farUVrange

Colour temperature and the wavelengths of light are two distinct aspects of light, yet they are closely intertwined and influence each other. The wavelength of light is crucial for determining colour temperature. When looking at white light, colour temperature describes our visual perception of the light, whether it appears warm or cool. Colour temperature is measured in the unit kelvin (K). A lower kelvin measurement (1000K-3000K) results in a warm, golden, or reddish light, while a higher kelvin (5000K or higher) produces a clear, cool, and blue light.

In essence, white light with a higher colour temperature contains a larger proportion of the short-wavelength blue and green colours, giving the light an overall cool white – or bluish – appearance. Conversely, white light with a lower colour temperature includes the long-wavelength warm, yellow, and reddish colours. Colour temperature and wavelengths are two ways to describe the same variation, with colour temperature more tied to our subjective perception of colour, while wavelengths are an objective measure of the physical properties of light. When discussing blue light, it refers to short-wavelength white light (5000K or higher) that appears cool and blue to the human eye. In contrast, blue-free light refers to long-wavelength white light (1000K-3000K) that looks warm, golden, or amber-like, akin to a flame. These are commonly referred to as cool white and warm white, respectively, in everyday conversation.

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However, white light is not simply white. It is much broader than one might initially think. White light contains all the colours of the rainbow. Therefore, white light can vary from being cool and blue to more warm and golden, or even reddish in appearance. This colour variation depends on two key factors, colour temperature and wavelengths. To better understand white light, it is necessary to understand what colour temperature and wavelengths are.

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Far-UV region

When discussing the benefits of our circadian lighting, we often mention "blue" or "blue-free" light. But what does that mean? We delve into the concept and explore the various aspects of white light.

In this article, we will introduce UV Lamp. With our suggestions, you will find the most suitable fluorescent ballast for your UV fluorescent light application.

In most places we frequent, the electric lighting remains the same colour and intensity throughout the day. Whether in a supermarket, waiting room, or at work, the light is rarely anything other than bright and white. This stark contrast with the sunlight outside, where the white light changes with the passing hours, is quite noticeable.

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White light consists of a broad spectrum of colours in different wavelengths. This means that each wavelength emitted by the light represents a specific colour. At one end of the spectrum is blue light, characterized by a short wavelength, while at the other is red light, with a longer wavelength. In between these extremes, a plethora of other colours can be found, reminiscent of a rainbow.

As the colour temperature increases, the blue tone of the light becomes more noticeable. Amidst the warm and cool hues, there lies the neutral white light. However, it's essential to distinguish between what we perceive and the physical properties that determine whether the light feels warm or cool – all of which depend on the wavelengths of the light.

Ultraviolet light or what we called UV light is a type of electromagnetic radiation. Electromagnetic adiation is a form of energy, most of which is invisible to the human eye. UV radiation or UV light is one form of electromagnetic radiation which is measured on a scientific scale called the electromagnetic (EM) spectrum.