Pro Lite Technology

LightMtrX Spectroradiometer Software

Labsphere LightMtrX Software

Quite simply, our easiest to use light measurement software yet

Labsphere's LightMtrX software forms part of our modular integrating sphere and Half Moon integrating hemisphere spectroradiometer systems. LightMtrX provides control of a CDS-series CCD spectrometer for performing spectroradiometric, photometric and colorimetric measurements of LEDs and other light sources. Our opinion - and that of our customers - is that LightMtrX is quite simply the easiest to use software yet released for performing light source measurements. It features user-defined "methods" which simplify repetitive testing, an auxiliary correction capability and the ability to perform both electrical and optical testing in conjunction with a Keithley 2400 series SourceMeter.

LightMtrX Software Displays

Spectral Flux and Much, Much More

LightMtrX records spectral radiant flux (Watts per nm) in the 350-1050nm range (the actual range depends upon the spectrometer chosen), then computes the radiant flux (in Watts), the luminous flux (in lumens) and the peak wavelength (nm). If your spectroradiometer system employs an I-1000 or I-2000 intensity head, the measurement recorded is the spectral radiant intensity (Watts per steradian per nm) and luminous intensity (in candelas) in accordance with CIE 84. If you connect your spectroradiometer to the E-1000 irradiance receiver, you can measure spectral irradiance (Watts per square meter per nm) and illuminance (lux). LightMtrX can apply the CIE V(l) standard observer function for photopic (daylight) vision and the CIE V'(l) function for scotopic (night-time) vision.

Chromaticity, Colour Temperature & Colour Rendering

LightMtrX performs both photometric and colorimetric measurements. From the spectral power distribution, LightMtrX computes the CIE chromaticity coordinates (x,y) and (u',v'), the correlated colour temperature (CCT, Kelvin) for white light sources, dominant wavelength for coloured LEDs and spectral purity. The general colour rendering index (CRI, Ra) and the 14 special colour rendering indices R1-14 are also computed in accordance with CIE 13.3.

Feature-Rich yet Simple-to-Use

Labsphere's experience in light metrology really shows when it comes to the numertous advanced features contained in LightMtrX, many of which have been developed just to make using the software as simple and intuitive as possible. Integrating sphere measurements suffer from absorption or reflection errors which arise from placing the device under test either within the sphere or at the external source port. The magnitude of the error varies with the size of the sample and diameter of the sphere, but typically runs into the tens of percent. The solution is simple and involves the use of an auxiliary lamp mounted on the sphere which is used to guage the level of absorption or reflection from the sample. LightMtrX allows you to record and apply multiple auxiliary correction factors for all of the sample types that you routinely test. LightMtrX also allows you to define a "method" which greatly simplifies the repeat testing of sample types. A user-defined method automatically applies your chosen calibration and auxiliary correction, sets the optimum measurement integration time and reports only those photometric, spectral and colorimetric parameters that you have specified. It is also possible to output a simplified test report based upon user-defined pass/fail criteria. Users will appreciate the ability to define and save their preferred "views", in other words, to choose what data is automatically displayed (choose from summary results, spectral or temporal charts, the CIE chromaticity diagram and the details of the user method in operation).

Advanced Anlysis

LightMtrX can record temporal "strip charts" that log the variation of luminous flux, colour temperature or other radiometric, photometric or colorimetric parameters with time. You can chart data every second or every minute and set the test to run for up to 50 minutes. Chromaticity data is plotted on a full sized CIE 1931 (2° observer) chromaticity diagram and further benchmark analysis is provided with selectable fluorescent ellipses, LED quadrangles and LED nominal colour temperature tolerance quadrangles.

Electrical Control & Analysis

The variation of light and colour output as a function of LED drive current and voltage can be determined very simply in conjunction with a Keithley 2400-series SourceMeter. LightMtrX includes an interface to the Keithley meter which drives the LED under test at different levels. The temporal chart function in LightMtrX can also plot device current or voltage over time.

Suitable for R&D as well as Production QC

LightMtrX is so simple to use that it can be operated with a minimum of operator training, which helps get measurements done more quickly. DLL drivers are provided as standard with LightMtrX software and example scripts written in the most popular programming languages are included. When you are ready to transition from development into product testing, LightMtrX can be adapted for use in an automated production test environment.

Specifications

Hardware Compatibility  
   Spectrometers CDS-600, CDS-610, CDS-100 & CDS-2100
   Integrating Sphere Spectroradiometer Systems CSLMS-Series, FS2-Series
   Half Moon Spectroradiometer Systems HMS-Series
   Keithley SourceMeters 2400-Series
   Other I-1000, I-2000 & E-1000 Sensor Heads
Measurement Capabilities1  
Spectroradiometric (300-1050nm)  
  Spectral radiant flux, Watts/nm
  Spectral radiant intensity, Watts/steradian.nm
  Spectral irradiance, Watts/sq. meter.nm
Radiometric (integrated in the spectral band)  
  Radiant flux, Watts
  Radiant intensity, Watts/steradian
  Irradiance, Watts/sq. meter
Spectral  
  Peak wavelength, nm
  Centroid wavelength, nm
  FWHM spectral bandwidth, nm
Photometric  
  Luminous flux, lumens
  Scotopic luminous flux, lumens
  Luminous efficacy, lumens/Watt
  Luminous intensity, candelas
  Illuminance, lux
Colorimetric  
  CIE chromaticity xy 
  CIE chromaticity uv
  Delta uv
  CIE chromaticity u'v'
  Correlated colour temperature CCT, Kelvin
  Dominant wavelength, nm
  Excitation purity, %
  General colour rendering index CRI, Ra
  Special colour rendering indices, R1-14
Electrical  
  Device drive current, Amps
  Device drive Voltage, Volts
Software Features  
Data Representation  
  Spectral chart (Watts/nm vs. wavelength)
  Temporal chart (time-elapsed)
  CIE chromaticity diagram
  Summary numeric results
  Detailed numeric results
Other Features  
  User-defined methods
  User-defined views
  User-defined target values with pass/fail reporting
  Auxiliary correction facility
  Chromaticity diagram with selectable fluorescent ellipses, & LED nominal colour temperature tolerance quadrangles
  Interface to Keithley 2400-series SourceMeters
  Data export (delimited text, XML format)
  API with DLL drivers
Computer Requirements  
Operating System Windows XP
Interface USB 2.0 (to CDS-series spectrometer & Keithley 2400 SourceMeter)
Processor 2.0 GHz or faster
Memory 1GB or greater

1. Measurement capabilities and spectral range are dependent upon the spectroradiometer hardware
    configuration and calibration source used. An integrating sphere is required for flux measurements, an I-1000 or
    I-2000 for intensity and an E-1000 for irradiance/illuminance.
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