Blue Light Hazard

Careful evaluation of blue light hazard in light sources

Blue Light Hazard

Careful evaluation of blue light hazard in light sources

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New standards for safe lighting

The fast-growing significance of state-of-the-art solid state lighting (SSL) light sources in the living and working environment raises important questions with regard to safety. These include photobiological safety, and in particular blue light hazard (BLH). Blue light can cause photochemical damage to the retina, and may result in degeneration of the macula.

The BLH weighting function covers the wavelength range between 300 and 700 nm, and has a maximum at 435–440 nm. In view of the striking blue peaks of white LEDs, the question of hazard from SSL light sources must be posed.

The challenge: Determination of BLH risk classes pursuant to standard IEC 62471

International Standard IEC 62471 sets forth guidelines for assessing the photobiological safety of lamps and luminaires. It places stringent requirements on measuring equipment and processes, to ensure reliable assessment of photobiological hazards and the correct subdivision into BLH risk classes for light sources. Depending on the weighted radiance and exposure times, IEC 62471 classifies light sources into four risk groups from 0 (exempt) to 3 (high risk).

In addition, Technical Report IEC-TR 62778 explains how IEC 62741 can be used for simple assessment of the blue light hazard of lamps and luminaires with visible radiation. Currently, efforts are underway worldwide to develop this technical report into a new standard and to add detailed measuring procedures for BLH assessment that are accessible to a broader community. Instrument Systems is actively supporting these efforts.

Sample systems for Blue Light Hazard

Blue Light Hazard Measurement

Determination of blue light hazard in acc. with IEC 62471 and IEC/TR 62778