ANSI/IESNA RP-27.1:2005 pdf download.Recommended Practice for Photobiological Safety for Lamps and Lamp Systems – General Requirements.
Note: The degree of delayed erythema is used as a guide to dosages applied in ultraviolet therapy.
3.4 Exposure Limit
A value of exposure to the eye or skin that is not expected to result in adverse biological effects is called the exposure limit.
3.5 Exposure Distance
Nearest points of human exposure consistent with the application of the lamp.
3.6 General Lighting Source, GLS
A general 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. It also does not include lamps with outer envelopes constructed from quartz material that is not doped to block UV-B and UV-C (see Section 3.19). Although lamps with undoped quartz outer envelopes may be used in locations typically occupied by people, their potential to emit ultraviolet power requires that they be more carefully evaluated. The process for classifying lamps is described in sections of the third document in this series, Recommended Practice for Photobiological Safety for Lamps – Risk Group ClassificatiOn arid Labeling, RP 27.3.
3.7 Hazard Distance
See Skin Hazard Distance (Section 3.18) or Ocular Hazard Distance (Section 3.13).
3.8 Infrared Radiation
For practical purposes any radiant energy within the wavelength range 770 nm to 106 nm. The infrared spectrum is divided into three spectral bands for safety purposes: IR-A (770 nm to 1400 nm). IR-B (1400 nm to 3000 nm), and IR-C (3000 nm to 106 nm).
Note: Infrared radiation is generally evaluated in terms of the spectral total radiation per unit area (irradiance) incident upon a surface. Examples of applications of infrared radiation are industrial heating, drying, baking, and photo-reproduction. Some applications, such as infrared viewing systems, involve detectors sensitive to a restricted range of wavelengths; in these cases, the spectral characteristics of the source and detector are of importance.
Wavelengths shorter Than 320 nm are most effective in causing photokeratoconjunctivitis. The peak of the action spectrum is approximately at 270 nm.
3.15 Pulsed Lamp
A lamp that delivers its energy in the form of a single
pulse or a train of pulses where each pulse shall have
a time duration of less than 0.25 s.
Note 1: The duration of a lamp pulse is the time interval between the half-power points on the leading and the trailing edges of the pulse.
Note 2: In this standard. General Lighting Source lamps are defined to be Continuous Wave lamps (see Section 3.2). Examples of pulsed lamps include photoflash lamps, flashlamps in photocopy machines, and strobe lights.
3.16 Retinal Burn
A photochemical or Thermal retinal lesion.
3.17 RetInal Hazard Region
The spectral region from 375 nm to 1400 nm (visible plus IR-A) within which the normal ocular media transmit optical radiation to the retina.
3.18 Skin Hazard Distance
The distance at which the irradiance exceeds the applicable exposure limit for 8 hours exposure.
3.19 Ultraviolet Radiation
For practical purposes, ultraviolet (UV) radiation is any radiation within the wavelength range from 100 nm to 400 nm. The UV-C extends from 100 nm to 280 nm, UV-B from 280 nm to 315 nm, and UV-Afrom
315 nm to 400 nm as defined by the Commission Intemationale de l’Eclairage (CIE). Frequently in photobiology, the wavelength bands are taken as UV-C from 200 nm to 290 nm, UV-B from 290 nm to 320 nm, and UV-A from 320 nm to 400 nm. Ultraviolet radiation at wavelengths less than 200 nm is considered vacuum ultraviolet radiation. Note that the radiation between 380 nm and 400 nm is visible radiation (see Section 3.20) although it also is within the formal definition of the ultraviolet band.
3.20 VIsible Radiation
Radiation within the wavelength range from 380 nm to 770 nm is considered to be visible radiation. See iighr in the Glossary.
