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I.E.C.
International Electrotechnical Commission
U.L.
Underwriter's Laboratories
Medical Electrical Equipment
Electrical equipment intended to diagnose, treat the patient under medical supervision.
Electrical equipment that transfers energy to the patient .
Central Illuminance
Illuminance of light head measured at 1 meter from the light emitting area with no
obstructions. Expressed in Foot-candles or Lux.
Light Field Center
Point of maximum illuminance in lighted area. This is the reference point for light field
size and light distribution measurements.
Light Field Diameter
Diameter of the circle where illuminance reaches 10% of light field center illuminance.
Depth of Illumination
The overall distance from 1 meter where the central illuminance is reduced to 20%.
Shadow Dilution
Ability of the equipment to minimize the impact of shadows in the working area. Shadows
can be due to partial obstruction by the operator or other medical personnel.
Correlated Color Temperature
The color temperature of the light fixture when compared to a blackbody radiator
expressed in degrees Kelvin.
Total Irradiance
The total amount of energy imparted to the patient by the lighting system expressed in
Watts/meter squared.
Color Rendering Index (CRI)
A method of how well a light source will render other colors when illuminating them based
upon eight CIE chromaticity coordinates measured with a spectroradiometer.
Handle Sterilizable
Device when properly sterilized maintains a sterile area in order to handle it under aseptic
conditions when attached to the equipment.
5368 KUHL ROAD ● ERIE, PENNSYLVANIA 16510 ● PHONE 814-899-4220 ● FAX 814-899-1410
Terminology
Definition of Terms
A member of the Medical Illumination International Group
Section 1
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