AS NZS IEC 62471:2011 pdf download.Photobiological safety of lamps and lamp systems
1. SCOPE
AS NZS IEC 62471 gives guidance for evaluating the photobiological safety of lamps and lamp systems including luminaires. Specifically it specifies the exposure limits, reference measurement technique and classification scheme for the evaluation 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.
3.4 blue light hazard (BLH)
Potential for a photochemically induced retinal injury resulting from radiation exposure at wavelengths primarily between 400 nm and 500 nm. This damage mechanism dominates over the thermal damage mechanism for times exceeding 10 seconds.
3.6 erythema (see ILV 845-06-15)
Reddening of the skin; as used in this standard the reddening of the skin resulting from inflammatory effects from solar radiation or artificial optical radiation.
Note:The degree of delayed erythema is used as a guide to dosages applied in ultraviolet therapy.
3.7 exposure distance
Nearest point of human exposure consistent with the application of the lamp or lamp system. For lamps radiating in all directions the distance is measured from the centre of the filament or arc source.For reflector-type lamps the distance is measured from the outside edge of the lens or the plane defining the end of the reflector in a lens free reflector.
3.8 exposure limit (EL)
Level of exposure to the eye or skin that is not expected to result in adverse biological effects.
3.9 eye movements
The normal eye, when focused on an object, moves slightly in a random motion with a frequency of a few hertz. This rapid eye movement causes the image from a point source to be spread over an area of the retina equivalent to an angular subtense of about 0,011 radians. Furthermore, for times greater than about 100 seconds the focused stare capability breaks down causing further spreading of the radiant power over the retina due to task determined eye movements, e.g. as in reading.
3.11 general lighting service (GLS) lamps
Term for lamps intended for lighting spaces that are typically occupied or viewed by people. Examples would be lamps for lighting offices, schools, homes, factories, roadways, or automobiles. It does not include lamps for such uses as film projection, reprographic processes, "suntanning", industrial processes, medical treatment and searchlight applications.
As used in this standard, the term means an electrically powered source, other than a laser, that produces radiation in the visible region of the electromagnetic spectrum. Devices that generate light and have integral components for optical control,such as lenses or reflectors, also are considered lamps. Examples include a lensed LED, lens-end lamp, and reflector types,that consist of a source within a parabolic or elliptical reflector assembly, normally including a lens cover.AS NZS IEC 62471 pdf download.