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BTS256-LED-IB for the measurement of “Average LED Intensity” ILED-B according CIE Dokument 127 with the BTS256-LED

The BTS256-LED-IB adapter is used to enhance the measurement functions of the BTS256-LED making it possible to measure the averaged LED intensity. The integrating sphere of the BTS256-LED ensures high responsivity homogeneity levels over the 1cm² measurement surface. The LED tester, with its Bi-Technology sensor, ensures precise measurement of the averaged LED intensity, luminous flux, spectral radiant power, color temperature, Ra and R1 to R15 color rendering index, xy and u’v’.

The BTS256-LED is a high-quality light meter for measurement of the luminous flux, luminous spectrum and luminous color of LEDs in the visible spectral range. 

BiTec light sensor for complex light measurement 

One of the characteristic properties of the mobile light meter is its BiTec light sensor. This combines the characteristic properties of a silicon photodiode with those of a low-noise CMOS diode array. The BiTec sensor guarantees precise photometric, spectral-radiometric and colorimetric measurement values over a large dynamic range through mutual correction of the measurement signals of both sensors.

Silicon photodiode detector, fast and linear 

When taking into account the dynamic range, linearity and speed, silicon photodiodes have always been and are still the ultimate radiation detectors. A silicon photodiode is therefore incorporated in the BiTec light sensor of the BTS256-LED Tester. Its precise matching to the photometric V(λ) CIE responsivity is also ideal for LEDs due to the integration of the diode array’s spectral measurement data. 

Diode array detector for spectral measurement data 

The low-noise CMOS diode array of the BiTec Light sensor provides precise measurement data required for the luminous spectrum. This data is then used for calculation of the color values as well as for optimization of the photometric responsivity. 

Optimized Signal to Noise Ratio 

The noise signal of a diode array detector has significant influence on the Signal to Noise Ratio and thereby affects the quality of the measurement signal. A remote controlled shutter in the BiTec light sensor enables online compensation of the dark signals that are dependent on the temperature and integration time. 

Use with PC 

The BTS256-LED Tester has a USB 2.0 interface for use of the device with a PC. This enables both data exchange and battery charging. 

User software 

The S-BTS256 software included in the device’s price provides all the necessary functions for the measurements, measurement data display and data transfer. The cutting-edge, flexible desktop concept of the software offers the user an individual constellation of the required measurement values. This can be a full screen filled with lux measurement values or a matrix with both numerical and graphical fields. Each desktop constellation can easily be saved for future use. 

Diverse photometric and colorimetric measurement quantities 

A large span of measurement quantities is necessary for the verification and testing of LEDs. The BTS256-LED Tester offers twelve measurement quantities and thereby meets all the requirements for a modern light meter:

  • Ep Illuminance in lux
  • Ep Irradiance in W/m²
  • Eλ spectral irradiance
  • x, y CIE 1931 color coordinates
  • u‘, v‘ CIE 1976 color coordinates
  • CT color temperature
  • Δuv deviation from the blackbody locus
  • λdom dominant wavelength
  • λp peak intensity wavelength
  • λ0,5 spectral half-width
  • Purity color purity
  • CRI Ra and R1 to R15 Color Rendering Index

Software Development Kit 

Gigahertz-Optik offers programmers the S-SDK-BTS256 Software Development Tool. This can be used with LabView from National Instruments, .NET from Microsoft and C/C++. The SDKs simplify integration of the BTS256-LED Tester in an internally developed software. 

Traceable calibration 

The calibration is performed by Gigahertz-Optik’s calibration laboratory for photometric measurands. The calibration is done using calibration standards traceable to national and international standards. Recalibration is recommended after every 12 months. 

Expandable for additional measurement quantities 

The BTS256-LED Tester can be expand for additional measurement quantities using the accessories offered:

  • Diffuser window for measurement of the illuminance of less extensive light sources.
  • External integrating spheres for the luminous flux, luminous spectrum and luminous color of lamps and other luminaires.
  • Goniometer for measurement of the luminous intensity distribution.

For detailed information, please refer to the respective data sheets.

Full screen display of the luminous spectrum
S-BTS256 user software with modular desktop setup
CIE 1976 chromaticity table with binning fields
CRI Bar Plot
BTS256-LED Tester with 1m diameter integrating sphere
BTS256-LED Tester with GB-GD-360 goniometer
typical applications

Light meter for the ILED-B and color measurement. With other adapters luminous flux and spectral radiant power or illuminance and spectral irradiance are measurable.

Calibration uncertainty

+/-4% for Averaged LED Intensity (ILED-B)


This device is based on the BTS256-LED, please find detailed specification there.

Integral Detector
max. measurable ILED-B

100 Mcd

Noise equivalent ILED-B

7.5 mcd

Type Description File-Type Download
Datasheet BTS256-LED-IB PDF
Produktname Product Image Description Show product
S-SDK-BTS256 Software Development Kit for BTS256 variants.
S-BTS256 Application software for BTS256 variants.
Article-Nr Modell Description Request / Compare
15298508 BTS256-LED ILED-B Adapter

Adapter for BTS256-LED Tester to measure the "Averaged LED Intensity" in accordance to the CIE 127 measurement set-up B with 100mm measurement distance (0.01sr). Including calibration K-BTS256-LED-IB-I with merged BTS256-LED tester. Calibration certificate.

15308420 BTS256-LED

Measurement device, BTS256-LED-CA10 cone adapter, USB cable, hard-top casing, operation manual, software, calibration certificate.

15300819 K-BTS256-LED-ILED-B

Recalibration of the BTS256-LED-IB

ISD integrating spheres

External integrating spheres with diameters ranging from 21cm to 100cm (data sheet: BTS256-LED with ISD integrating sphere)


Goniometer (data sheet: BTS256-LED with GB-GD-360)

15298108 S-BTS256

User software for BTS256 and variants.

15298218 S-SDK-BTS256

Software Development Kit for the implementation of the BTS256 or variants into custom made software

Note: BTS256-LED-X

The use of cone adapters with measurement ports larger or smaller than 10mm increases the measurement uncertainty and is only recommendable in applications where the standard units are not suitable.

15297954 BTS256-LED-CA5

Cone adapter with 5mm measurement port

102620-2 BTS256-LED-CA6

Cone adapter with 6mm measurement port

102620-3 BTS256-LED-CA7

Cone adapter with 7mm measurement port

102620-4 BTS256-LED-CA8

Cone adapter with 8mm measurement port

102620-5 BTS256-LED-CA9

Cone adapter with 9mm measurement port

15297955 BTS256-LED-CA10

Cone adapter with 10mm measurement port

102620-6 BTS256-LED-CA11

Cone adapter with 11mm measurement port

102620-7 BTS256-LED-CA12

Cone adapter with 12mm measurement port

102620-8 BTS256-LED-CA13

Cone adapter with 13mm measurement port

102620-9 BTS256-LED-CA14

Cone adapter with 14mm measurement port

15297959 BTS256-LED-DA

Diffuser window (BTS256-LED data sheet with BTS256-LED-DA)

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