When exposed suddenly to a highly intense visible light source, most people exhibit an aversion response that includes blinking and turning the head. In most circumstances, visible light is not hazardous, and measurement of continuous visible light emissions is usually not necessary. IR‐B (mid-infrared): 1,400 and 3,000 nmįor all currently known arc and incandescent sources, the contribution made by the IR-C spectral region (above 3,000 nm) is normally of little or no practical concern.Infrared radiationis divided into the following three bands: Glassblowing and working in glass and steel plants are considered potentially hazardous due to excessive IR radiation. Man‐made sources of IR radiation include heated metals, molten glass, home electrical appliances, incandescent bulbs, radiant heaters, furnaces, welding arcs, and plasma torches. We experience IR radiation every day in the form of heat because IR waves are thermal. It is estimated that more than half (54%) of the sun’s radiation is infrared, whereas 39% is the visible rays and the remaining 7% is the ultraviolet rays. The majority of infrared (IR) radiation is emitted from the sun, but man-made devices also contribute to its proliferation. Man‐made sources of broad‐spectrum intense visible light include arc welding or cutting, arc lamps, spotlights, gas and vapor discharge tubes, flash lamps, open flames, and explosions. Within the visible light spectrum, blue light (400–500 nm) is of particular importance. Visible light is generally defined as the portion of the electromagnetic spectrum between 380–400 nanometers (nm) and approximately 760 nm.
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