Full range of light meters, 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 (ILT400 and 490) which are self-contained and have specific spectral response models available.
ILT5000 Research Radiometer
The ILT5000 is the ILT1700 for the 21st Century. Improvements on the industry standard ILT1700 include rapid optical measurements (1-100hz), a broader dynamic range (100fA to 1mA), 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.
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.
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, please contact us for more details.
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.
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.
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 100μS 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.
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.
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 of 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
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).
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
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” 33mm² 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 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.
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.
ILT350 Illuminance Spectrophotometer
The hand-held ILT350 Illuminance Spectrophotometer was designed for portability, quality and ease of use. The housing design is ergonomic and light weight yet packed with features such as a built in full colour display. Extensive data capture and analysis software, rechargeable battery and internal data storage. The menu buttons are intuitive and easy to use.
The built-in 12 mm diameter cosine receptor is protected by a magnetic rubber cap that remains attached to prevent loss or damage. The toggle buttons allows the user to easily scroll up and down to view not only lux & foot candles, but also spectrum, CRI, CCT, tri-stimulus values, and more.
The ILT350 has three measurement speeds including Fast (0.5 s), Slow (2.5 s) and Auto (0.5 – 27 s) depending on light intensities (20 lux to 100K lux). The spectral resolution is approximately 10 nm with an accuracy of ±3 nm. Relative spectral distribution data is exported in 1 nm increments using the light meter software.
The internal memory can store up to 100 files and export data into Excel/Work formats.
Commercial and residential lighting designs and upgrades
Display booth, colour and spectrum
Comparison of traditional sources to LEDs
Light efficiency testing
ILT800 CureRight Radiometer
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 customized to your unique environment.
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.
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.
Audience scanning immerses the audience with light in many shapes and sizes (laser beams, cones, fans, waves, sheets, etc) so that the laser light is actually touching people. It is a truly an immersive effect that allows people to virtually touch and interact with the light. Laser lighting can be shined directly at the audience, reflect off natural and artificial structures in the environment, or focused on the stage and performer. Regardless of the directionality of the display, there is a risk for over exposure to the human eye
Endoscope and other fibre optic illuminator lighting systems were previously considered difficult to trouble shoot in the field, and were commonly sent out to certified laboratories for evaluation, repair, replacement or service. In many cases expensive components were simply swapped out for new parts when test equipment was too costly or unavailable. ILT offers a selection of portable light measurement testing systems that allow easy measurement of fiber optic lighting systems including endoscopes, laparoscopes, cystoscopes, microscope illuminators, spot curing sources and more.
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.
International Light Technologies has designed a selection of systems to measure almost any Optical Radiation Hazard application as defined by ICNIRP, ACGIH and EU Directive 2006/25/EC.
Sources emitting optical radiation are of paramount concern to hygienists, safety engineers, and public health officials, both from their beneficial effects and their potential as a hazard to health and safety
Photodynamic Therapy involves the use of optical radiation in the cure of medical maladies. Phototherapy is defined as the treatment of medical, psychological, or cosmetic conditions by exposure to light.
Photodynamic Therapy or PDT is a specialized type of phototherapy for the treatment of cancers and, like some phototherapy treatments, uses photosensitizers, but in a different way
Photoresist is a light-sensitive chemical substance that is used to form a coating on a surface or substrate and is used to form patterns for industrial processing. This coating can then be exposed to a specific band of light, referred to as the photoresist’s action spectrum, to affect a desired change in the photoresist. This change causes the photoresist to either become soluble or insoluble to another chemical called the developer which will be washed over the photoresist
International Light Technologies has developed a line of reliable, highly accurate light measurement systems capable of both research and development or clinical use and available to match the wide variety of light sources used in modern phototherapy treatments.
ILT meters come with NIST traceable, ISO 17025 accredited calibrations in units of Watts, Lumens, Watt/cm2, lux and foot-candles as well as full spectrum analysis
ILT offers a full line of light measurement systems designed to test, quantify and monitor both natural and artificial light sources used in plant growth, photobiology, photomedicine, and UV photobiology studies.
ILT systems cover the full range of optical radiation (UVB, UVA, VIS and NIR-Far Red) spectrum for measurement of PAR, PPF, PPFD, and RQE with direct readout in µmol/m2/sec (pronounced micro moles per square meter per second). ILT Spectrometers are available to provide complete spectral analysis from UV-NIR in µmol/m2/sec/nm, as well as transmission and reflectance
ILT offers specialised systems for testing Solar UVB with a billion-to-one VIS/IR rejection. This is critical for testing Solar UVB since nearly all of the sun's energy is in the longer wavelengths. Using the same radiometers included with the solar UVB system, different detectors, filters, optics and calibrations can be ordered for testing UVA, VIS, NIR and IR.
Curing a product with exposure to UV light, while fast and economical, requires careful control of the exposure process such as the spectral output of the light source, intensity levels, and exposure times of the products.
International Light Technologies has developed a broad range of UV curing-specific light measurement systems to aid in the challenging task of defining and monitoring these critical process variables