About LED Eye Safety Testing
Can Light Emitting Diodes (LED’s) used in today’s consumer electronics cause eyestrain, headaches, and increased risk of eye damage? Research is increasingly proving these hazards to be of concern, which is why LED Eye Safety Testing is used to determine if there is a blue light hazard.
Consumers are regularly exposed to narrow spectrums of intense LED light. This is especially true of white LEDs because they include more blue light emissions, making this is a concern for LED product manufacturers and consumers alike.
Photobiological Safety Testing and Evaluation
- Evaluation to ANSI/IESNA RP-27, Recommended Practice for Photobiological Safety for Lamps Evaluation to IEC 62471 (CIE S009)
- Evaluation to IEC 60825-1
- Evaluation to ISO 15004-2:2007 (Light Hazard Assessment for Opthalmic Instruments)
- Report validating traceable testing procedures
- Recommendations for appropriate product classifications and labeling
CSA Group Seattle applies ANSI and IESNA recommended practices for LED eye safety testing and evaluation.
About Product Testing
The responsibility for product safety and hazard assessments fall on the end-product manufacturer. A system that seems safe when looking at separate components can be re-classified with the addition of a lens or other optic so LED product manufacturers need to test their assembled products rather than rely on the specifications of individual LEDs.
All worst-case fault conditions are part of making a hazard assessment. Consider conditions where a short circuit occurs in a transistor driving an LED. This condition drives current through the device beyond its intended design. The resulting luminous intensity could put the product in a higher classification if the quality of the light changes with current.
Product testing is all about consumer safety. Ethical resellers only sell products with proper labeling that meet requirements for the market where the product will be sold.
Spectral radiance (W/m-1 sr-1) from LED sources is measured for eye safety. Different wavelengths can affect different structures of the eye.
The Future of LED Eye Safety
Manufacturers are focused on proper classification standards in differing markets. In some countries products containing LEDs were once classified as lasers, not LEDs (IEC 60825-1). Fortunately, IEC 62471 (in a “dual-logo” standard with CIE S009) replaces IEC 60825-1 for LEDs internationally and classifies LEDs by their risk group (i.e., Exempt, RG-1, RG-2, RG-3).
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