Ben Parker
Sales Manager
+44 (0)1372 378822
International Light Technologies Light Meters  ILT2400, ILT950, ILT1700

International Light Technologies Light Meters

Full range of easy-to-use radiometers and photometers

International Light Technologies offer a full range of light meters from economical lux/foot candle light meters to calibrated, NIST-traceable radiometers and photometers with a comprehensive selection of light detectors for measuring a variety of visible, UV, and infrared light sources such as lamps, LEDs, and lasers.

ILT Light Meters, Radiometers and Photometers can be configured with almost any one of the large selection of application-specific light sensors (light detectors), except belt radiometers (ILT800 series) which are self-contained and have specific spectral response models available.


  • Easy-to-use high performance instruments
  • Perfect for use as photometers, intensity meters, curing meters, power meters and flash meters
  • Wide range of input optics for correct and accurate measurements in a wide range of optical units 
  • Sensors are available to measure from 185 nm out to 40 microns
  • Calibration service for all meters and detectors
  • We offer a comprehensive consultation service to determine light measurement needs
  • Contact: Ben Parker
    Sales Manager

    +44 (0)1372 378822


    ILT800 CureRight Radiometer

    Replacing the ILT400 and ILT490 series of belt radiometers, the ILT800 CureRight is a feature-rich profiling UV radiometer that delivers unmatched flexibility and capability not found in any other system. The ILT800 Radiometer meets a broad range of applications across a variety of light measurement needs. The system has been designed with the varying needs of its users in mind, and can be configured and customised to your unique environment.

    ILT800 Screen

    The ILT800 CureRight series is designed to measure and validate all types of UV curing methods and sources including conveyor, belt, oven, flood, area, spot, fiber optic, collimated beam, side cure, 180° curing, 3D printing, pulsed and traditional UV lamps, and UV/VIS LEDs &  light sources. It is currently avialable in 5 spectral configurations: UVC, UV, UVA, UVF, and BAV.



    The ILT800 CureRight system outperforms the competitors with features such as profiling of current/previous/stored measurements, ability to monitor, measure, view and export the date, time, temperature, irradiance, dose, cal due date, model and serial number, and battery status. User programmable settings include minimum light level threshold, lamp-to-lamp measurement interval (delay), time to auto shutoff, and auto/manual/live measurement modes. The ILT800 is the only radiometer with Device ID which allows users to program up to 20 unique system/source information, allowing users to store and export baselines and historical data for all their curing stations in one economically priced meter.  

    ILT2470XE UV Flash Measurement System

    The ILT2470XE UV Flash Measurement System is designed to measure pulsed UV sources across the range of 215 - 350 nm for applications including, UV curing, sterilisation (germicidal /disinfection), mushroom irradiation to boost vitamin D, PE sintering, and process development / R&D. This system includes the ILT2400XE hand-held flash optical meter with ILT's custom Flash App developed specifically for Xenon Corporation, which features:

    Automatic zero

    Flash profile

    Flash integration

    Flash counter

    Integrates up to 250 readings per second


    The system is designed for use with the included SED270 SiC (silicon carbide) UV sensor for UV pulsed light sources.

    ILT2500 CW and Pulsed/Flash Light Measurement System

    The ILT2500 is the most versatile light measurement system ever designed by ILT.  It combines the ease-of-use of our hand-held, portable optometer, the measurement range of a research/lab radiometer, pulsed light profiling similar to an oscilloscope, and the spectral measurement capability of a spectrometer.  Together with our NIST traceable / ISO 17025 accredited calibration, and a wide array of sensors, input optics, integrating spheres, and the new MEMS 880 spectrometer head, the applications for the ILT2500 abound!


    Large, 4.3" capacitive touch screen display

    Hand-held, ergonomic design

    Built-in Faraday Cage for low end stability

    Broadest measurement range in its class at 9 decades

    Flash measurement capability with:

    • Flash App:  for 0 to 250 Hz with graphical profile
    • Beacon App:  .3 to 1.4 Hz for NFPA72 strobe testing with programmable flash count, integral peak and frequency

    Proprietary spectrum App

    • The ONLY hand-held meter that can also be used as a spectrometer
    • Spectrum App measures 380-840 nm with ILT spectrometer head MEMS 880

    Made in the USA

    ILT5000 Research Radiometer

    The ILT5000 is the ILT1700 for the 21st Century.  Improvements on the industry standard ILT1700 include rapid optical measurements (1-100 Hz), a broader dynamic range (100 fA to 1 mA), Datalight III for PC and Mac, plus built-in wireless, data storage, and rechargeable batteries.

    The ILT5000 is backwards compatible with the ILT1700 sensor configurations, as well as all of ILT's sensor accessories including filters, optics, integrating spheres and ISO 17025/NIST traceable calibrations.

    ILT5000 optical measurement systems typically consist of the ILT5000 light meter, a sensor, filter, optic and calibration to allow direct reading in the appropriate empirical units including lux, foot-candles, candela, lumens, watts, W/cm2, cd/m2, foot-lamberts, nits, etc.


    Measurement systems:

    The ILT5000 meter requires a sensor to measure light. Sensors are available to measure from 185 nm out to 40 micron and are supported with a vast array of accessory including bandpass filter, cosine receptors, integrating sphere, and numerous types of calibration.

    ILT2400 Hand-Held Light Meter & Optometer

    The ILT2400 is the most advanced hand held light meter and optometer on the market today.  ILT’s Accuspan software automatically sets the averaging while rapidly measuring over 8 decades of light intensities.  The internal software allows customers to capture a peak as brief as 100 μS and to store up to 16 readings per second. The colour display works in both landscape and portrait mode.

    The ILT2400 supports numerous light measurement applications including Audience Scanning Laser Safety, General Purpose Light Measurements, Research, Sterilisation/UVGI, Solar, Photoresist – lithography, Optical Radiation Hazard, Phototherapy, Photo-Degradation, PPF & PPFD Plant Studies, and more.

    Measurement systems:

    The ILT2400 meter requires a sensor to measure light. Sensors are available to measure from 185 nm out to 40 micron and are supported with a vast array of accessory including bandpass filter, cosine receptors, integrating sphere, and numerous types of calibration.

    ILT1000 Light Meter Monitor & Data Logger

    The most versatile UV, VIS and IR data logging optometer available on the market today. System configurations are based on the industry standard ILT1700 Research Radiometer/Photometer detectors, filter/optics and calibrations.

    The ILT1000 was designed with OEM and custom configurations in mind and can easily accommodate most solid state detectors, bypass filters and a vast selection of input optics. Integrating one or more ILT1000's into your system is easy.

    The ILT1000 is capable of measuring 8 decades of light intensity (i.e. nW/cm2, W/cm2) and providing direct readout in W, W/cm², Lux, Fc, Lumens, cd/m², cd, W/sr, W/sr/cm² and more.

    On board data storage allows continuous monitoring at customer specified sampling rates using the “set it and forget it” data logging functionality.

    Applications include Camera/Phone flash photometry, Beacon/Exit-sign/Aerospace effective candela measurements, Audience scanning/laser light show exposure, Germicidal, Pharmaceutical/cosmetics, Semiconductor, Lithography, Process Monitoring, Curing, Plant Photobiology, Thin Film Deposition, Ribbon Clarity/Glass Production and Liquid Turbidity, and Transmission Measurements.

    ILT6000 Rack Mount Multi System Radiometer

    Each ILT6000 rack mount kit includes 2 units, expandable to 10 units per rack (A6000 add on kit sold separately)

    Stand-alone or mount in standard 19” rack

    Run multiple systems simultaneously allowing measurements from 2 to 100 units

    10 decade dynamic range of optical analysis

    Built in wireless (ILT6000A wired version)

    DataLight III software for Windows (7, 8, 10) and Mac iOS

    Labview compatible

    NIST-Traceable/ISO17025 accredited calibration and certificate

    ILT70 Series Light Meters

    Simple, NIST-traceable, hand-held Light Meters / Radiometers designed for routine use that can be customised with application specific detectors, labelling, graphics, and colours for OEMs and resellers.

    Developed to offer OEMs and resellers a versatile instrument, ILT70 Series Light Meters / Radiometers are available in standard models to measure UVA (Model ILT72CE), UVB (Model ILT73CE - broadband or narrowband), bilirubin (Model ILT74CE - irradiance and band irradiance units), and germicidal (Model ILT77CE) wavelengths.

    Custom sensors can also be designed for measurements between the spectral ranges of 200 and 1100 nm with readout in units of W/cm2, W/cm2/nm, W, lux, cd/m2, as well as other empirical units.

    ILT70 Series Light Meters / Radiometers can be further customised with a variety of feature sets including a hold function, exposure reading, and automatic shut-off.  Featuring a 4½ digit LCD that provides a direct readout, this rugged light meter/radiometer has a low-battery indicator and protective rubber boot available in several colours

    ILT10C Lux Meter

    The ILT10C Light Meter is ILT’s most economical light measurement system. The ILT10C reads out in either Lux or Foot Candles in the human eye Visible range (400-700 nm) and is designed for use in a wide variety of applications needing a quick, accurate light measurement.

    Typical applications include new light fixture installations requiring proof of minimum or maximum light output, confirmation of adequate lighting in factory production areas, in public building stairways and corridors, to meet lighting compliance regulations, etc.

    ILT Light Detectors

    ILT detectors are designed to emit low levels of current in the pico-amp to milli-amp range which is then converted to calibrated optical units such as lux, W, W/cm2... when used with ILT light meters. Detector assemblies typically include a sensor, filter, optic and calibration.


    Example of a calibrated detector assembly for lux: "SED033/Y/W" includes the “SED033” 33 mm² silicon photodiode detector, the “Y” photopic correction filter with the “W” Diffuser and calibration.

    (Note: “/U” indicates an uncalibrated sensor).


    The SED and SPM type optical detector housings are made of black anodized aluminium, with female filter threads (1¼-24), a tripod mount (¼-20), and two end mounts (#8-32). Only these housings allow for filter selection/swapping and underwater modification. All underwater modified detectors (SUD) require the W wide-eye diffuser in addition to any other filters and come special order in 10, 50 or 100 foot lengths.


    These four versions do not have removable, swappable filters and cannot be made waterproof:

    The SCD type optical detectors are in a 42 x 19 x 14 mm housing.

    The SSD type optical detectors are ultra-low profile (31 x 41 x 4.3 mm) detectors for UV measurements.

    The XSD type optical detectors are in a 15 x 42 mm dia. housing with M6X1 tapped hole for mounting.

    SPD type detectors are in a 121 x 19 mm dia. pen style housing.

    ILT Optical Filters

    Optical filters are often used to attenuate certain wavelengths of light and produce an overall desired detector response.

    Interference filters rely on harmonic interference between waves to provide very narrow passbands. Thin metal films are spaced half the desired wavelength apart by a dielectric spacer.  Interference filters are capable of bandwidths less than 10 nm.

    Absorptive filters typically consist of glass that has been doped with a concentration of dye that absorbs particular colours. Since spectral transmission varies logarithmically with thickness, the band pass can be reduced by thickening the filter.

    Multiple colour filters can be layered to match a desired function, such as the CIE photopic response, which defines the eye's sensitivity to colour. The combined spectral response is the product of the filter's transmission and the spectral responsivity of the detector.

    ILT's optical filters are the building blocks that allow a myriad of applications. Mounted in threaded (1 1/4-24 thread) black anodized rings, all filters may be repeatedly interchanged on any SED, SEL, and SHD detector. Unmounted filters and empty filter rings are also available.

    ILT can also create weighted measurement functions for applications such as the new UV Actinic Hazard standard, where UV exposure at a critical wavelength has a proportionally greater effect (as defined by ACGIH, NIOSH) than exposure at nearby wavelengths. ILT weights the sensitivity at each wavelength using thin film techniques or composite absorptive layering to accurately indicate exposure levels in a single measurement.

    ILT Input Optics

    Light measurement units are defined around very specific spatial responses. A carefully designed input optics system is essential if measurement accuracy is to be achieved. Two laws of geometrical optics apply directly to radiometry and photometry: the inverse square law and the cosine law.

    The inverse square law defines the relationship between irradiance from a point source and the distance to the measurement surface. It states that the intensity per unit area varies in inverse proportion to the square of the distance between the source and surface. In other words, if you measure 16 W/cm² at 1 meter, you will measure 4 W/cm² at 2 meters, and can calculate the irradiance at any other distance. A well defined measurement plane and approximate point source are required for valid interpolations.

    In radiance measurements (W/cm²/sr), where a detector with a narrow viewing angle looks at a much larger, uniform area source, the area of the source that the detector sees increases as the detector moves farther away, counteracting the effects of the inverse square law and making the reading independent of distance. Radiance measurements are useful for characterising large area sources such as CRT's and backlit displays, or for diffuse, uniformly illuminated surfaces. The cosine law refers to the relationship between the irradiance on a surface and the incident angle. The intensity falls off in proportion to the cosine of the reflected angle, since the effective surface area is reduced as the angle increases.

    Irradiance and Illuminance detectors, especially those with filters that restrict off-angle light, require cosine correction to properly quantify light coming from all angles. Inaccurate cosine response is one of the biggest sources of error in full immersion applications.

    There are many applications in light measurement that require specialized input optics. For example, intense laser beams must be diffused so that the narrow beam does not locally saturate the receiver. Many high intensity ultraviolet sources require temperature resistant remote optics that offer cosine spatial responses and side viewing.

    Supplier info:

    For even more information, why not visit our suppliers website.