IEC 62471:2006 pdf download.Photobiological safety of lamps and lamp systems
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.
3.5 continuous wave (CW) lamp
Lamp that is operated with a continuous output for a time greater than 0,25 s, i.e., a non-pulsed lamp.
Note: In this standard, General lighting service (GLS) lamps are defined to be Continuous wave lamps.
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.
3.7 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.
3.10 field of view
Solid angle as "seen" by the detector (acceptance angle), such as the radiometer/ spectroradiometer,out of which the detector receives radiation.
Note 1: The field of view should not be confused with the angular subtense of the apparent source a.
Note 2: A plane angle is sometimes used to describe a circular symmetric solid angle field of view.IEC 62471 pdf download.