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ARE- BS - Lighting

TermDefinition
Luminous Intensity Measure of the wavelength-weighted power emitted by a light source - measured in candelas
Lumen Measure of photometric power
Illuminance Measure of how much light illuminates a surface - measured in footcandles
Retina Distinguishes light colors into rods and cones
Cornea Responsible for controlling the amount of light needed by the eye
Lens Responsible to focusing objects that come into the eye
Color Rendition Index Refers to how closely colors appear to their intention based on the light source used - incandescent lamps are best for this
Incandescent Lamp Tungsten filament inside a gas-filled, sealed glass envelope. Low in cost but have low life-expectancy and good CRI.
Tungsten Halogen Lamp Longer life, lower lumen depreciation, and smaller envelope than a comparative incandescent fixture
Fluorescent Lamp Poor color rendition index, longer life than incandescent lamps, require ballast
LED Lamp High life expectancy, high initial cost, low life-cycle cost
High-Pressure Sodium Hard to distinguish colors, good for exterior applications, high life expectancy
Indirect Lighting System in which light output of the luminaires is directed towards the ceiling and upper walls of a room
Efficacy The efficiency of a lighting source in lumens/watt
Lamp Lumen Depreciation The deterioration of the lumen output of a lamp as it ages.
Mercury Vapor One of the HID lamp types. Require a warm-up period and are not great on the CRI. Initially developed for use with exterior lighting applications.
Metal Halide Developed to improve the mercury vapor lamp. Contain a quartz arc tube
High-Pressure Sodium Most efficient lamp. Poor with color rendering and require a warm-up period.
Low-Pressure Sodium Used in security applications due to poor color rendering
Created by: skbehm
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