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UV light is electromagnetic radiation and is transmitted in the form of waves, which can be described by their wavelength. Wavelength is the length of one complete wave cycle. UV light wavelengths are measured in nanometers (nm), where 1 nm = 1 millionth of a millimetre. It occupies a portion of the electromagnetic radiation spectrum which lies between x-rays and the blue end of visible light. This is the region from 100 nm to 400 nm.

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Measures all light produced by all visible colors of LED, fluorescent lamp, metal-halide lamp, high voltage sodium lamp or electric incandescent lamp. Measuring range is up to : 0.00~200000 Lux / 0∼20000 FC

A UV light source is best defined by its UV light emission spectrum which is the energy distribution as a function of wavelength. An example is provided, where the emission spectrum is shown relative to peak wavelength.

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UV light energy is inversely proportional to wavelength, therefore biological and indeed physical and chemical effects change with UV light wavelength across the bands.

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The classification band(s) of a UV light source will however broadly indicate its potential to cause biological damage. The level of risk for adverse health effects to the unprotected skin and eyes from UV light exposure is determined by the UV light wavelengths present, UV light irradiance values and an individual’s exposure time.

The depth of penetration increases with the increasing wavelength of UV light. Therefore UV-A light penetrates deeper than UV-B light which penetrates deeper than UV-C light.

The table below summaries the UV light classification bands and broadly speaking their potential to cause adverse health effects.

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The ICNIRP guidelines take the lower limit of the UV-C region to be 180 nm. This is because UV light below 180 nm is readily attenuated in air, and is therefore of little practical biological significance. UV light below 180 nm is known as vacuum UV (VUV) as for practical purposes it only exists in a vacuum.

The International Commission on Illumination (CIE 1970) has defined the following spectral range classification bands, according to broad biological effects. The region 315 nm to 400 nm is designated as UV-A, 280 nm to 315 nm as UV-B and 100 nm to 280 nm as UV-C.

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● Built-in high precision diode sensor● color correction filter for indoor use● Digital and analog bargraph display● Ring Spectral Range: 320‑730 mm● For all visible light and LED white● Unit Selection: LUX.FC (Foot candles)● :Silicone photodiode sensor● Sampling Time: ≥2 times/sec.

It is worth noting that some photobiologists consider the dividing line between UV-A and UV-B to be 320 nm, because most acute and chronic effects of sunlight exposure on biological systems are believed to occur at wavelengths below 320 nm. In addition, the division between UV-B and UV-C is sometimes re-defined at 290 nm, since this is the approximate lower limit of terrestrial radiation.

UV light (ultraviolet light), also referred to as ultraviolet radiation and UV radiation is invisible to the human eye. It occurs naturally in sunlight and is produced artificially, normally by either heating a body to an incandescent temperature or by excitation of a gas discharge.

However, it must be emphasised that the dividing lines between the UV light classification bands are chosen as convenient distinctions. They do not represent boundaries where sudden, large changes occur in the biological effects of UV light.