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LED testing to EN62471Test and Certification of LED and non-laser light sources

Lasermet is UKAS Accredited to test LEDs and other non-laser intense light sources to
BS EN 62471 – Photobiological safety of lamps and lamp systems

Test Lab 2682

Lasermet is the UK’s leading test house for testing to the following standards:

  • BS/EN 60825-1 / IEC 60825-1*
  • BS/EN 60825-2 / IEC 60825-2
  • BS/EN 60825-12 / IEC 60825-12*
  • BS/EN 60601-2-22 / IEC 60601-2-22*
  • 21 CFR 1040.10
  • BS/EN 60825-1:2014, 2007, 2001 (off-site)
  • BS EN 62471 – Photobiological safety of lamps and lamp systems

and is the only test house with UKAS accreditation for laser and LED testing (other than the National Physical Laboratory).

BS EN 62471 is used to assess the hazard from LEDs, LED arrays, lamps and general lighting sources.

In accordance with the standard, the irradiance (Wm-2 and radiance (Wm-2sr-1) are measured, weighted according to the spectral distribution, and compared to the Risk Group limits of the following hazards:

  • Actinic UV
  • UV-A
  • Blue Light
  • Eye IR
  • Skin Thermal
  • Retinal Thermal
  • Retinal Thermal Weak Visual Stimulus

Depending upon how the radiance / irradiance compares to the limits, the product would be assigned to

  • Risk Group Exempt
  • Risk Group 1
  • Risk Group 2
  • Risk Group 3

How long a light source will be safe to look at would depend both  upon the Risk Group and the wavelength.

Examples of products we have already tested to BS EN 62471 inlcude:

  • Medical LEDs
  • Floodlights
  • Phone camera LEDs
  • Forensic LEDs
  • Night Vision IR illuminators

Which standard do I use to test LEDs or Lasers?

More information on these standards can be found below:

These are the European, International and USA laser safety standards:

  • Prototype & Finished Product Testing
  • Consultancy at the Design Stage
  • CE Marking
  • Equipment Required for Testing
  • Advice note – Single Fault Protection

Prototype & Finished Product Testing

We will test and certify your prototype or completed product to the appropriate standard or standards and provide a full test report including details of:

  • Measurement test results
  • Risk group assignment
  • Required Engineering Controls
  • Required Labelling
  • Required information in User Manual and Product Brochures
  • Failure modes of drive electronics and other reasonably foreseeable failures affecting safety

Where a product fails to meet the desired classification due to minor failures, we will issue a classification conditional upon making listed changes (eg labelling, user information and minor engineering changes). Where a retest is required this will normally be carried out at a reduced fee.

Consultancy at the Design Stage

Imagine this scenario:

You spend two years developing a product using LEDs (or other non-laser light source). Your attention will focus on achieving an excellent product and only when you are nearing production do you submit your product for LED safety testing – only to find that changes are needed to meet the standard.  At late stages of development, changes can be expensive and can delay production and sales. Significant design changes can be expensive in terms of money and time.

Therefore, to avoid a scenario where you need to make changes to your product, in order to meet the safety requirements of BS EN 62471, we recommend that you get us involved at an early stage in the design process.

CE Marking, Safety Standards and FDA (CDRH) Registration

Europe

As part of the process of CE marking, all LED products sold in Europe must be certified to EN 62471

  • Low Voltage Directive
  • Machinery Directive
  • General Product Safety Directive
  • Radio & Telecommunication Transmission Equipment Directive
  • Medical Devices Directive

and thus applies to all LED products.

Most manufacturers prefer to have independent verification of their compliance with the relevant LED safety requirements.

In European countires, manufacturers achieve product conformity by certifying products to the applicable standards. It is the responsibilty of the manufacturer to identify the relevant standards, design the product appropriately and to make a declaration of conformity in the user manual. The various national enforcement organisations, such as The Trading Standards Organisation in the UK, detect non-conformances and intervene accordingly. The standards are set by committees of experts and are under under continual review and amendment. This places responsibility on manufacturers, but enables standards to be kept up to date with changing technology, the latest information knowledge and changes to current practice.

USA

The situation in the USA is different for LED products. Product safety in the USA is controlled by Federal Regulations which are enforced by the Food & Drug Administration (FDA).

LED products are not covered by any Federal Regulation (e.g. 21 CFR 1040.10) and do not need to be registered.

International

BS EN 62471 is the standard to which Lasermet is UKAS Accredited.

Equipment Required for Testing LED Products (and other non-laser light sources)

  1. 1 off Working equipment
  2. 2 off LED diodes (plus 5 off spare LEDs) and (if applicable) LED modules
  3. 1 off Circuit diagram for the LED drive circuit and module (if applicable).
  4. 1 off Set of printed circuit masks and drawings showing component layout.
  5. 1 off Explanation of circuit function (particularly if the circuitry is complex).
  6. 1 off Manufacturers specification sheet for the LED diode and any directly associated integrated circuits
  7. 1 off Any relevant instruction manuals
  8. 1 off Interlock® circuit (if applicable)
  9. 1 off Circuit diagram for Interlock® (if applicable)

NB: If some of the information/items requested above is/are not supplied it may take considerable time to analyse the circuit which may result in extra test costs being charged. In some cases it may be impossible to classify the equipment without all the applicable samples/information listed above.

Consequently we strongly advise manufacturers to consider their drive electronics very carefully to ensure that the reasonably foreseeable single fault failure requirement has been covered. Otherwise serious problems are likely to arise at the testing stage, which is usually when manufacturers are under pressure to get the product on sale.

 

To find out more about LED testing to EN62471, contact us now!

Call us now: 01202 770740

Email: office@lasermet.com

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