Flicker400 Light Source Modulation Characterisation

  • Flicker400 Source Modulation Characterisation
  • Example Light Source Flicker

Comprising a close-match photometric detector, high-speed amplifier and data acquisition, the Flicker400 provides high-accuracy flicker percent, frequency and index assessment in a straightforward, highly repeatable procedure.

Whilst the photobiological impact of flicker is still widely debated, the implications for image recording equipment are undeniably apparent and of increasing significance with the continued adoption of SSL in studio and stadium environments.

Core benefits


  • Windows control software (BenWin+) provides full automation via USB 2.0
  • Setup comprises a DH400-VL v-lambda detector, ORM400 photometric detector, the 477 and the USB Digital Scope.


  • ENERGY STAR® Method of Measurement for Light Source Flicker
  • California Energy Commission Appendix JA10
  • 1789-2015 - IEEE Recommended Practices for Modulating Current in High-Brightness LEDs for Mitigating Health Risks to Viewers
  • UEFA Stadium Lighting Guide 2016
  • CIBSE LG04 Lighting Guide 04: Sports Lighting - LG4
  • ASSIST recommends…Recommended Metric for Assessing the Direct Perception of Light Source Flicker, Volume 11, Issue 3 (ASSIST 2015)

Reported Parameters

  • Percent flicker
  • Flicker index
  • Flicker frequency

Photometric Detector/ ORM400

Spectral function CIE 1924 V(λ) Spectral Luminous Efficiency Function for Photopic Vision
Spectral response range 380-780nm
Photopic match, f1 <3%
Angular response, f2 <1.5%
Linearity, f3 < .2%
Typical responsivity 5x 10-10A/lux
Calibration traceability Physikalisch-Technische Bundesanstalt (PTB, Germany)
Diffuser diameter 7mm
Stray light suppression Variable aperture baffle tube
Connector BNC
Amplifier gain ranges 1010-105 V/A
Maximum input 100µA
Input impedance Virtual ground
Gain accuracy & stability ±1 %, 200 ppm/ °C
Output stability 5-500 ppm/ °C dependent on gain range
ADC resolution 4 ½ digit BCD (0 to 19999) (>14 bit resolution)
Luminous intensity range 0.01D2-200000D2 (D photometric distance (m))

477 - AC Current Pre-amplifier frequency response

V/A Bandwidth (-3Db)
103 >1MHz
104 1MHz
105 260kHz
106 30kHz
107 23kHz
108 4kHz


Power supply PMC MAC ORM400
Interface USB 2.0

System Requirements

Component Current (220V) (A)
ORM400 <0.1
Total <0.1
LED flicker emission and propagation characterisation
Flicker400 LED modulation characterisation measurement
Source photometric flicker characterisation
Flicker400 source modulation characterisation measurement

Software Control

LED flicker emission and propagation characterisation
Flicker400 LED modulation characterisation measurement

BenWin+ software package captures data acquisition and export, alongside performing flicker percent and flicker index calculations.

A comprehensive SDK is made available where enhanced functionality or incorporation of third party instruments are required.

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