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.

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

  • UVA:  315nm - 400 nm
  • UVB:  280nm - 315nm
  • UVC:  100nm - 280nm

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

ILT Germicidal Light Measurement Systems

ILT offers a wide range of pre-configured and customizable germicidal light measurement systems. Our latest models are the ILT950 SpectrometerILT5000 Research RadiometerILT2400 Hand Held Light Meter with touch screen display and our ILT1000 Data Logger.

Use the table below to identify the system (meter + detector) that meets your specific application.  Use the table to find the spectral range you wish to measure.  The table can be filtered to show our meters by type, (e.g., hand-held), as well as searching on the minimum and maximum spectral range you wish to measure.  The tables can also be sorted to group systems by meter type, spectral range, measurement range, and units.  Click the product link of the system to view it's details.

Need assistance?  Contact us using the form below, or by calling us at 978-818-6180.

* 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). 

Application Common Sources Meter Type Spectral Range Measurement Range Units Product
Germicidal Mercury arc, tube, UV, Xenon arc, Xenon Mercury Arc, UV-LED Bench-top/Lab 235-307 nm 3e-9 – 2.5e-3 eff W/cm² ILT5000, SED240/ACT5/W
Germicidal Mercury arc, tube, UV, Xenon arc, Xenon Mercury Arc, UV-LED Bench-top/Lab 235-307 nm 5e-9 – 2.5e-3 eff W/cm² ILT1700,SED240/ACT5/W
Germicidal Mercury arc, tube, UV, Xenon arc, Xenon Mercury Arc, UV-LED Handheld 235-307 nm 8e-8 – 1e-3 eff W/cm² ILT2400,SED240/T2ACT5
Narrow Band 254nm with Best VIS/IR Blocking Any Bench-top/Lab 249-259 nm 8e-9 – 4e-3 W/cm² ILT1700,SED240/NS254/W
Narrow Band 254nm with Best VIS/IR Blocking Any Handheld 254 nm 2e-6 – 0.02 W/cm² ILT2400,SED240/NS254/TD
Low Visibility Environment, High UV Intensity Grid Lamps, LED's, HVAC (low visible apps) Handheld 254 nm 5e-7 – 0.3 W/cm² ILT1254/QT,ILT2400, SED254/QT
Low Visibility Environment, High UV Intensity Grid Lamps, LED's, HVAC (low visible apps) Bench-top/Lab 249-259 nm 4e-9 – 3 W/cm² ILT5000,XRD140T254
Low Visibility Environment, High UV Intensity Grid Lamps, LED's, HVAC (low visible apps) Bench-top/Lab 249-259 nm 6.67e-9 – 6.67 W/cm² ILT1700,XRD140T254
Low Visibility Environment, High UV Intensity Grid Lamps, LED's, HVAC (low visible apps) Handheld 254 nm 2e-7 – 2 W/cm² ILT2400,XRD140T254
Effective Germicidal Radiation Measurement Low Pressure Mercury or Narrow Band UV LED Bench-top/Lab 215-350 nm 1e-9 – 1 W/cm² ILT5000/SED270/QT
Effective Germicidal Radiation Measurement, UV-LED Irradiance, Spot/uniformity testing UV Low Pressure Mercury or Narrow Band UV LED, UV LED's, UV Flash light, UV curing LED Low Profile 215-350 nm 7e-8 – 1 W/cm² ILT1270/QT
Effective Germicidal Radiation Measurement Low Pressure Mercury or Narrow Band UV LED Handheld 215-350 nm 7e-8 – 1 W/cm² ILT2400, SED270/QT
Effective Germicidal Radiation Measurement Low Pressure Mercury or Narrow Band UV LED Handheld 215-350 nm 7e-8 – 1 W/cm² ILT2400, SED270/QT
Effective Germicidal Radiation Measurement Low Pressure Mercury or Narrow Band UV LED Handheld 214-360 nm 1 – 199.99 mW/cm² ILT77CE Germicidal Radiometer
Effective Germicidal Radiation Measurement Low Pressure Mercury or Narrow Band UV LED Bench-top/Lab 185-310 nm 1e-9 – 5e-4 W/cm² ILT5000,SED240/W
Effective Germicidal Radiation Measurement Low Pressure Mercury or Narrow Band UV LED Bench-top/Lab 185-310 nm 1e-9 – 5e-4 W/cm² ILT1700,SED240/W
Effective Germicidal Radiation Measurement Low Pressure Mercury or Narrow Band UV LED Handheld 185-310 nm 2e-5 – 0.3 W/cm² ILT2400,SED240/QNDS2/TD
Effective Germicidal Radiation Measurement Low Pressure Mercury or Narrow Band UV LED Bench-top/Lab 185-310 nm 6.67e-6 – 0.333 W/cm² ILT5000,SED240/QNDS2/W
Ozone / Germicidal Narrow Band Germicidal/Ozone Bench-top/Lab 185 nm 4.76e-7 – 0.476 W/cm² ILT5000, SED185/NS185
Ozone / Germicidal Low Intensity, Ozone-Producing Lamps Bench-top/Lab 165-200 nm 9.52e-7 – 0.476 W/cm² ILT1700,SED185/NS185
Ozone / Germicidal Low Intensity, Ozone-Producing Lamps Handheld 165-200 nm 2e-5 – 0.3 W/cm² ILT2400,SED185/NS185
Ozone / Germicidal Low Intensity, Ozone-Producing Lamps Bench-top/Lab 165-200 nm 5e-9 – 2e-3 W/cm² ILT1700,SED220/NS185
Air and Water Sterilization LED's Low Profile 365 nm 2e-6 – 1 W/cm² ILT1005/NS365/W,ILT2400/SED005/NS365/W
UVA, UVB, UVC with Spectral Analysis Any Spectrometer 200-450 nm Customized Spectrum ILT950 Spectroradiometer