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LCRT-2005-S stationary light transmission measurement device with fast data logger

Light transmission

Light transmission is the visually sensed light permeability of materials. It is particularly important when it comes to specification of window panes on all types of vehicles, display sheets and disks as well as all the other samples whose transmission is assessed with the photometric responsivity (V(λ)) of the human eye.

LCRT-2005-SIS light transmission measurement device

The LCRT-2005-SIS is elaborately designed for light transmission in stationary applications. The light source is built with a compact integrating sphere that enables diffuse sample illumination (D/0) in small distances and directed (0/0) sample illumination at large distances. The receiver has a 0.38° measurement field angle and a 6.6mm optical gauge. The monitor detector of the light source and that of the receiver are equipped with a diode array. Their spectral measurement data enables precise simulation of the standard illuminants A, D65 and C and the photometric responsivity of the receiver.

Fast data logger

The detector of the light source and the detector of the receiver are equipped with diode arrays and with photometric matched silicon photodiodes. The fast photodiodes enable high-speed recording of measurement values e.g. as required to measure the response time of electrotropic glasses.

LCRT-2005-SIS spectrophotometer

The LCRT-2005-S can also be used as a spectrophotometer due to its spectral measurement detectors in source and receiver. The spectral range is between 425 nm and 705 nm.

Remote control interface

The controller of the LCRT-2005-SIS has a USB, LAN and RS232 interface for remote control.

Traceable measurements

Two transmission standards, one with 70 % and the other with 80 % light transmittance are offered for device 100 % reference matching in applications where traceable measurement values are required.

Recording of the response time of electrotropic glasses with the datalogger measurement function of the LCRT-2005-SIS. Additional spectral transmission measurement on defined support points
Short description

Stationare measuring instrument for light transmission.

Main features

Spectral measuring method. Build in photometric detector for fast data sampling. Compact source and receiver. Build in camera for receiver to source alignment support. SC-05 Controller. Puls modulated LED lamp for measurements in ambient light conditions.

Measurement range

Spectral range: 425 nm to 705 nm

Spectral resolution: 5 nm

Transmission range: 5 % to 100 %

Measurement beam diameter: 6.6 mm 

Illumination: A, C, D65

Detection: Spectral Photometric, Spectral Radiometric, Photometric photodiode.

typical applications

Measurement of the light lransmission all kinds of windows. Measurement of the time depending on/off characteristic of smart glass. 


Realative measurement methode with 100 % reference adjustment.

Optional calibration with 70 % or 80 % calibration standards.   

Measurement geometry

D/0 geometry

measurement of the luminance ratio with a diffuse light source as per CIE 130 & DIN 5036

Beam diameter

6.6 mm at contact measurement

Light Source

Integrating sphere light source with a 20mm illumination field. LED lamps and diode array monitor detector. Simulation of the standard illuminants type A, D65 and D50.


Diode array detector with radiant lens and V(λ) silicon photodiode. Depolarizer for measurement of polarized samples; simulation of the photometric responsivity with the spectral measurement data. Digital camera for aid in freehand setup of source and receiver.

spectral range

425 nm to 705 nm

Measurement range

5 % to 100 % transmission for a color-neutral transmission spectrum

typical Measurement uncertainty

± 1 % absolute

Data Resolution

0.1 %


Relative measurements after performing 100% match against air.
Traceable measurements after matching with calibrated standard filters.

Light Source

Integrating sphere with synthetic ODM98 coating. 20 mm illumination field diameter with homogenous luminance distribution (lambertian radiator). illumination field with a protective shield.

Light Source

White LEDs in pulse mode, usable wavelength range: 425 nm to 705 nm

Monitor detector

256 pixel diode array spectrometer and V(λ) silicon photodiode

Connection cable

Length 1.5 m

Mini DIN plug

RS232 and voltage supply


Aluminium profile with plastic caps

threaded bores for mounting


160 mm x 45 (60) mm x 85 mm


450 g


256 pixel diode array spectrometer and V(λ) silicon photodiode and achromatically corrected lens. Depolarizer for measurement of polarized samples.

Measurement beam geometry

Measurement field angle 0.38 °

Sample alignment 0 °

illumination field diameter by contact measurement 6.6 mm, in 1 m measurement distance 12.6 mm

Connection cable

Length 1.5 m

Mini DIN plug

RS232 and voltage supply


160 mm x 45 (60) mm x 85 mm


400 g


Similar to the SC-05 system controller with LCRT-2005-SIS firmware

Source and receiver connector

9PIN SUBD plug


USB, RS232 and LAN

Power Supply

Connection: 7,5-25VDC

USB: 5V (450mA)


105 mm x 128 mm x 126 mm


500 g

temperature range

10 °C to 40 °C


Above the saturation temperature (<85 % on the measurement device)

Type Description File-Type Download
Datasheet LCRT-2005-SIS PDF
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Article-Nr Modell Description Request / Compare
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Measurement device, 100% matching aid, handbook

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15297875 LCRT-2005-S-BN-T80

Spectral calibration standard with 80% light transmission; calibration certificate

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