Blue Light Hazard Testing

Ensure safety of your displays and lighting with high precision instrument testing and classification from Gamma Scientific. We utilize a high dynamic array spectrometer and carefully designed test adapters which allow fast, accurate and repeatable determination of Blue Light Hazard dangers and categorization into risk groups accordingly. Integrated software provides fast and full insight into measurements optimizing production and efficiencies, all while ensuring safe products. The team at Gamma Scientific is dedicated to providing you with the blue light hazard measurement you need.

IEC/EN 62471 and IEC/TR 62778 give guidance for evaluating the photobiological safety of lamps, lamp systems including luminaries and all LED lighting products. Specifically, it defines emission limits for adverse health effects, references measurement techniques and the classification scheme for the evaluation (risk groups) and control of photobiological hazards from all electrically powered incoherent broadband sources of optical radiation, including LEDs (but excluding lasers), in the wavelength range from 200 nm through 3000 nm. 


Key Features:

•Determination of blue light hazard in accordance with IEC 62471 and IEC/TR 62778

•Subdivision into risk groups based on highly precise measurements

  • Radiance:

1.Blue light hazard spectral weighting function: B(λ)

2.Spectral Radiance: L(λ)

3.Blue light-weighted radiance L(B) = L(λ) * B(λ)

4. BLH Risk Group (RG)

  • Irradiance:

1.Blue light hazard spectral weighting function: B(λ)

2.Spectral Irradiance E(λ)

3. Blue light-weighted  Irradiance E(B) = E(λ)*B(λ)

4.BLH Risk Group (RG)


The purpose of the blue light hazard measuring system from Gamma Scientific is to evaluate and classify displays and luminaires according to blue light hazard as described in Standards IEC 62471 and IEC/TR 62778.

Precise blue light hazard measurements on the basis of our established GS-1220 spectroradiometer and testing techniques guarantee the testing result and thus the classification scheme for the evaluation (risk groups)

The standard classifies permissible exposure time through risk assessment, sorted into three main categories: exempt, group 1 (low-risk), group 2 (moderate-risk), and group 3 (high-risk), as noted by the below chart:


To determine the risk group of a light source, its spectral irradiance or radiance has to be measured at a specified distance, weighted with the specific working spectra and maximum allowed exposure time, which is compared to different exposure limits. For example, the exposure time limits from continuous sources are as follows:


Safety Compliance

To date, the European Union (EU) is the only jurisdiction that specifically mandates protection against optical radiation under the essential health and safety requirements of its Low Voltage Directive (LVD). EU’s version of IEC 62471, EN 62471: 2008, has been harmonized with the requirements of the LVD, so testing to its requirements now provides evidence of compliance with the LVD’s requirements in this area. LED manufacturers should strongly consider testing their products in accordance with IEC 62471 to provide continued access to this important market.

Compliance with photobiological safety requirements in the U.S. and throughout the rest of the world is still voluntary. However, evidence of testing to the requirements of IEC 62471 can be used for product certification under the IECEE CB scheme, which supports the mutual acceptance by more than 50 member countries of test reports and certificates dealing with the safety of electrical and electronic products and components. Therefore, compliance with the requirements IEC 62471 can ease the path toward worldwide market access.

The blue light hazard test systems offered by Gamma Scientific:

Standard radiance measurement methodGS-1220 Spectroradiometers with an aperture used as a test adapter. Covers the entire spectral range of the weighting function for blue light hazard (BLH) from 300nm to 900 nm.

Alternative spectral radiance measurement with a GS-1290-DMS system. Covers spectral range from 380nm to 900nm.

Spectral irradiance measurement method GS-1220 Spectroradiometers with a sphere used as a testing adapter, 300nm-900nm

Weighting, calculation, and analysis for both methods are performed in the Light Touch software.




GS-1220 Spectroradiometric measurement system (250-900 nm) with 2-meter UV fiber-optic probe, temperature stabilized, back illuminated CCD, with shutter, 2.5 nm HPBW slit setting, USB Interface

GS-1290-DMS- system

Spectroradiometric Display Measurement System, includes GS-1290-3-RM spectroradiometer,  66146-50 telescope, 2m flexible fiber-optic coupler, Light Touch DMS software, Light Touch Controller, ISO/IEC 17025 calibration report
Measurement of BLH for light sources that exhibit no radiation below 380 nm

Aperture tube

25606A Aperture 

Integrating Spheres

General Purpose Integrating Spheres, different sizes


Spectral Irradiance Standard with integrated power supply - Calibrated from 300-1100 nm, 2856 K


Spectral Radiance Standard with integrated power supply - Calibrated from 300-1100 nm, 2856 K


Light touch controller (Windows rackmount computer) with Light Touch software and calibration files preinstalled. Includes keyboard, display, mouse.

Product Applications

GS-1220 Spectroradiometers

RadOMA GS-1220 spectroradiometers provide a datapoint interval of 0.32 nm and are available in three wavelength ranges:

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GS-1290-DMS Display Measurement System

GS-1290-DMS display measurement spectroradiometers represent the state-of-the-art in speed and accuracy, with the highest dynamic range in an array-type spectroradiometer available.

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