Germicidal (UV Disinfection)

ILT offers germicidal radiometer systems for testing effective germicidal ultraviolet irradiance for most short wave UV ("UV-C") sources including ozone producing and non-ozone producing, low and medium pressure mercury lamps, xenon lamps and UV LEDs. ILT sensors come in many configurations - effective germicidal UV light measurements conforming to the IES Luckiesh and DIN standards. Filtered for narrow bands such as 254, 365, and 405 nm, and unfiltered sensors calibrated at peak wavelengths such as 254, 265 and 275 nm for testing narrow band sources.

Please SCROLL DOWN to review our selection of germicidal light measurement systems.

UV light is sub-divided into 3 distinct UV wavelength ranges (ISO-21348):

  • UV-A: 315 nm - 400 nm
  • UV-B: 280 nm - 315 nm
  • UV-C: 100 nm - 280 nm

Use of ultraviolet light for germicidal UV light disinfection (typically UV-C) is a technology which can be applied to air, water and surfaces.

Ultraviolet Germicidal Irradiation (UVGI) rapidly replacing traditional disinfection methods

Germicidal disinfection by exposure to ultraviolet (UV) light is seeing rapid deployment in food, pharmaceutical, hospitality, and medical markets throughout the world due to the effectiveness, ease of use, adaptability and relatively low expense of the technology as compared with the more complex, time consuming and costly methods currently in use such as chemical, steam, or heat disinfection.


UV Light

UV irradiation kills a broad range of microbes, in essence breaking the molecular bonds that hold the organism’s DNA together.  The most effective wavelength for accomplishing this is 263 nanometers (nm). However the most commonly used light sources have peaks ranging from 250 nm to 285 nm with both narrow band and broadband outputs.

Medium pressure UV lamps are typically utilized in applications requiring high intensity germicidal UV exposure where the large numbers of  LED or Hg lamps required to meet the intensity levels would be impractical due to cost and space, such as in large volume municipal water treatment facilities.

Due to their lower cost, low pressure Mercury (Hg) lamps which emit about 93% of their output 254 nm have traditionally been utilized in low to medium intensity germicidal applications such as food processing, low volume water treatment, and medical service and manufacturing.

Recent improvements in UV-LED flux density, stability and life hours have made UV-LEDs a viable solution for replacing traditional UV light sources such as mercury arc lamps, arch lamps, hot and cold cathode lamps and grid lamps. UV LEDs are more environmentally friendly as they do not contain harmful mercury, do not produce ozone and consume less energy (learn more about ILT UV LEDs).

ILT offers a wide range of pre-configured and customizable germicidal light measurement systems. Our latest models are the ILT950 Spectrometer, ILT5000 Research Radiometer, ILT2400 Hand Held Light Meter with touch screen display and our ILT1000 Data Logger.

Please see the table below to select from our most popularly sold configurations or click to email our technical support team for assistance with selection.


Application Common Sources Spectral Range ILT System Options
Click Links Below
Measurement Range Units
UVC, UVB, UVA with SPECTRAL ANALYSIS Any 200-450nm ILT950UV Spectroradiometer Customized Spectrum W/m²/nm
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DUAL GERMICIDAL LIGHT AND OPTICAL RADIATION HAZARD MEASUREMENT Mercury arc, tube; UV; Xenon arc; Xenon Mercury arc, UV-LED 235-307nm ILT5000,SED240/ACT5/W 3.00e-9 to 2.50e-3 eff W/cm²
    235-307nm ILT1700,SED240/ACT5/W 5.00e-9 to 2.50e-3 eff W/cm²
    235-307nm ILT2400,SED240/T2ACT5 8e-8 to 1e-3 eff W/cm²
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NARROW BAND 254 NM WITH BEST VIS/IR BLOCKING Any 249-259nm ILT1700,SED240/NS254/W 8.00e-9 to 4.00e-3 W/cm²
    CW 254nm ILT2400,SED240/NS254/TD 2e-6 to 2e-2 W/cm²
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LOW VIS ENVIRONMENT, HIGH UV INTENSITY Grid Lamp, LEDs, HVAC (low visible apps) CW 254nm ILT1254/QT,
ILT2400, SED254/QT
5e-7 to 3e-1 W/cm²
    249-259nm ILT5000,XRD140T254 4e-9 to 3 W/cm²
    249-259nm ILT1700,XRD140T254 6.67e-9 to 6.67e+0 W/cm²
    CW 254nm ILT2400,XRD140T254 2e-7 to 2 W/cm²
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EFFECTIVE GERMICIDAL RADIATION MEASUREMENT Low Pressure Mercury or Narrow Band UV LED 215-350nm ILT5000/SED270/QT 1e-9 to 1 W/cm²
    215-350nm ILT1270/QT 7e-8 to 1 W/cm²
    215-350nm ILT2400/SED270/QT 7e-8 to 1 W/cm²
    214-360nm ILT77 Germicidal Radiometer 1.00 to 199.99 mW/cm²
    185-310nm ILT5000,SED240/W 1.00e-9 to 5.00e-4 W/cm²
    185-310nm ILT1700,SED240/W 1.00e-9 to 5.00e-4 W/cm²
    185-310nm ILT2400,SED240/QNDS2/TD 2e-5 to 3e-1 W/cm²
    185-310nm ILT5000,SED240/QNDS2/W 6.67e-6 to 3.33e-1 W/cm²
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OZONE/GERMICIDAL Narrow Band Germicidal/Ozone 185nm ILT5000,SED185/NS185 4.76e-7 to 4.76e-1 W/cm²
  Low Intensity, Ozone-Producing Lamps 165-200nm ILT1700,SED185/NS185 9.52e-7 to 4.76e-1 W/cm²
    165-200nm ILT2400,SED185/NS185 2e-5 to 3e-1 W/cm²
    165-200nm ILT1700,SED220/NS185 5.00e-9 to 2.00e-3 W/cm²
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Violet-Blue LED Air and Water Sterilization with Narrow Band, High Power LEDs LEDs 365 nm Peak ILT1005/NS365/W,
2.0e-6 to 1.0e+0 W/cm²
  LEDs 405 nm Peak ILT1005/NS405/W,
1.1e-6 to 1.0e+0 W/cm²
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* All Radiometers/Photometers/Spectroradiometers are NIST Traceable.
* If units of measure are not shown please contact us (empirical units also available i.e. fc, fL, nits, lm/ft²).