Bentham’s ISR300-PSL spectroradiometer is an essential tool for accurately assessing the blue light hazard across a wide variety of lighting products.

CE marking of luminaires based on the EU low voltage directive 2014/35/EU needs execution of the EN 60598-1 standard according to which the assessment of blue light hazard must be conducted with reference to IEC TR 6278. The ISR300-PSL offers the luminaire manufacturer the most accurate and dependable direct assessment of blue light hazard, without extremely conservative assessment results generated by using a technique based on calculation and estimation.

Core Benefits

  • Assess all types of lighting product
  • Direct approach to blue light hazard testing
  • An essential tool in designing lighting products for compliance
  • No need for dark room or knowledge of standards


  • High-accuracy telespectroradiometer
  • Direct determination of blue light radiance in 11 mrad field of view
  • Calculation, report generation and software guidance with PSL Wizard application
  • Calibrated spectral radiance standard traceable to PTB, Germany
  • Fully automated over USB 2.0 with BenWin+ spectral acquisition software


  • EN 60598-1:2015, "Luminaires - Part 1: General requirements and tests"
  • EU Low Voltage Directive, 2014/35/EU
  • LEDs Magazine, 2015, "Risk group determination characterizes photobiological safety in LED lighting"
  • IECEE IEC TR 62778: 2014 page
  • IEC TR 62778, “Application of IEC 62471 for the assessment of blue light hazard to light sources and luminaires”
  • IEC 60598-1:2014, "Luminaires - Part 1: General requirements and tests"
  • IEC 62471:2006, "Photobiological safety of lamps and lamp systems"
  • CIE TN 002:2014, Relating Photochemical and Photobiological Quantities to Photometric Quantities

Reported Parameters

  • Spatially-averaged blue light radiance
  • Spatially-averaged spectral radiance
  • Threshold illuminance, Ethr
  • Threshold distance, dthr