The classification scheme below is derived from the standard of EN60825-1:2007. Semiconductor lasers are included in this standard but LED's are now NOT.

Class 1:

No risk to eyes or skin

Class 1 laser products are defined as safe in normal operations under reasonably foreseeable conditions, including direct viewing of the laser beam with optics that could concentrate the laser output into the eye. In addition to some intrinsically low power lasers and laser products, Class 1 laser products also include embedded products that totally enclose a higher Class of laser e.g. CD players, laser printers and most industrial laser processing machines.

Warning label: none

Class 1M:

Low risk to eyes. No risk to skin

Class 1M laser products are defined as safe in normal operations under reasonably foreseeable conditions, including direct viewing of the laser beam, but only provided the user does not employ optics that could concentrate the laser output into the eye. Unsafe conditions include use of a telescope or binoculars with a 1M laser emitting a well-collimated laser beam or use of an eye loupe or magnifier with a high divergence 1M source. Class 1M can be applied only where the laser wavelength is in the range 0.3025 to 4 µm.

Warning label: LASER RADIATION. DO NOT VIEW DIRECTLY WITH OPTICAL INSTRUMENTS

Class 2:

Low risk to eyes. No risk to skin

Class 2 laser products are defined as those emitting visible light for which the natural aversion response to bright light (including the blink reflex) prevents retinal injury, including direct viewing of the laser beam with optics that could concentrate the laser output into the eye. These lasers do, however, present a dazzle hazard.

Warning abel: DO NOT STARE INTO BEAM

Class 2M:

Low risk to eyes. No risk to skin

Class 2M laser products are defined as those emitting visible light for which the natural aversion response to bright light (including the blink reflex) prevents retinal injury for direct viewing of the laser beam but, as with Class 1M laser products, only provided the user does not employ optics that could concentrate the laser output into the eye. Class 2M can be applied only where the laser wavelength is in the range 0.4 to 0.7 µm.

Warning label: DO NOT STARE INTO BEAM OR VIEW DIRECTLY WITH OPTICAL INSTRUMENTS

Class 3R

Low risk to eyes. Low risk to skin

Class 3R laser products are defined as those for which the output is up to a factor of five over the maximum allowed for Class 1 or Class 2. Because of safety factors built into the limits for these classes, the risk of injury for direct viewing of a Class 3R laser beam remains low, but greater efforts should be taken in the use of these lasers to prevent direct eye exposure, especially for invisible Class 3R lasers. Class visible 3R incorporates many of the USA IIIa lasers and the so-called 3B-star.

Warning label: AVOID DIRECT EYE EXPOSURE (0.4 - 1.4 µm) or AVOID EXPOSURE TO THE BEAM

Class 3B

Medium risk to eyes. Low risk to skin

Class 3B laser products are defined as those for which direct exposure of the eye is hazardous, even taking aversion responses into account, but scattered laser light is usually safe. The higher power Class 3B lasers are also a skin hazard, but the natural aversion response to localised heating generally prevents a skin burn. Lasers that were Class 3B under the previous version of 60825-1 but which operate at a wavelength in the range 0.3025 to 4 µm and have output beams that are either high divergence or large diameter may qualify.

Warning label: AVOID EXPOSURE TO THE BEAM

Class 4

High risk to eyes and skin

Class 4 laser products are defined as those for which direct exposure of the eye and skin is hazardous and scattered laser light may be hazardous to the eyes. Such lasers are also a fire hazard. Lasers that were Class 4 under the previous version of 60825-1 remain Class 4 under the new scheme.

Warning label: AVOID EYE OR SKIN EXPOSURE TO DIRECT OR SCATTERED RADIATION